A wrong mate score by stockfish because 50 move rule

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Uri Blass
Posts: 8764
Joined: Wed Mar 08, 2006 11:37 pm
Location: Tel-Aviv Israel

A wrong mate score by stockfish because 50 move rule

Post by Uri Blass » Fri Oct 25, 2019 12:23 am



I analyze the position after 40.Ke7 and get a wrong mate score

FEN: 8/1p2KP2/1p4q1/1Pp5/2P5/N1Pp1k2/3P4/1N6 b - - 76 40

Stockfish_19102310_x64_modern:
1/8 00:00 633 317k +1.82 40. ... Qg5+ 41.Ke6 Qh6+ 42.Ke7
2/3 00:00 845 423k +2.10 40. ... Qg5+ 41.Ke6 Qf4
3/6 00:00 1k 542k +2.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kf8 Qf4
4/6 00:00 2k 922k +2.23 40. ... Qg7 41.Ke8 Qe5+ 42.Kf8
5/8 00:00 3k 1,117k +1.61 40. ... Qg5+ 41.Kf8 Qg6 42.Ke7 Qe4+ 43.Kf6 Qf4+ 44.Kg7
6/23 00:00 9k 1,847k +1.64 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kf8 Qh8+ 43.Ke7 Qh7 44.Kf6 Qh6+ 45.Ke7 Qh4+ 46.Ke8 Qe4+ 47.Kf8
7/26 00:00 17k 2,178k 0.00 40. ... Qh7 41.Kf6 Qh4+ 42.Kg7 Qg5+ 43.Kh7 Qf6 44.Kg8 Qg6+ 45.Kf8 Kf4 46.Ke8 Qe6+ 47.Kf8
8/25 00:00 19k 2,062k 0.00 40. ... Qh7 41.Kf6 Qh4+ 42.Kg7 Qg5+ 43.Kh7 Qf6 44.Kg8 Qg6+ 45.Kf8 Kf4 46.Ke8 Qe6+ 47.Kf8
9/20 00:00 21k 2,080k +1.93 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kf8 Qh8+ 43.Ke7 Qh7 44.Ke8 Qe4+ 45.Kd7 Qf4 46.Ke7
10/26 00:00 35k 2,496k +2.54 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kf8 Qf6 47.Kg8 Qg6+ 48.Kf8 Ke5 49.Ke7 Qd6+ 50.Ke8 Ke6 51.f8N+ Kf5 52.Nd7 Qe6+ 53.Kd8
11/26 00:00 37k 2,334k +2.69 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kf8 Qf6 47.Kg8 Qg6+ 48.Kf8 Ke5 49.Ke7 Qd6+ 50.Ke8 Ke6 51.f8N+ Kf5 52.Nd7
12/26 00:00 40k 2,355k +2.87 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kf8 Qf6 47.Kg8 Qg5+ 48.Kf8 Ke5 49.Ke8 Qg6 50.Ke7 Qd6+ 51.Ke8 Ke6 52.f8N+ Kf5 53.Nd7
13/27 00:00 92k 2,364k +5.14 40. ... Qg5+ 41.Ke8 Qh5 42.Ke7 Qe5+ 43.Kd7 Qf6 44.Kc7 Qxf7+ 45.Kxb6 Qe7 46.Ka7 Kf2 47.b6 Qe4 48.Nb5 Qxc4
14/30 00:00 138k 2,470k +4.92 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.b6 Qf7 47.Ka8 Ke2 48.Ka7 Qh7 49.Nb5 Qe4 50.N5a3 Qh1 51.Ka8
15/23 00:00 143k 2,469k +5.28 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.Kb6 Ke2 47.Ka5 Qc7+ 48.Ka4 Qd6 49.Ka5 Qe7 50.Ka4
16/25 00:00 163k 2,547k +5.56 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.b6 Ke2 47.Nb5 Kd1 48.Kb8 Qe4 49.Ka8
17/27 00:00 176k 2,584k +5.86 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.Kb6 Ke2 47.Ka5 Qd8+ 48.Ka4 Qc7 49.Kb3 Qe5 50.Ka4
18/30 00:00 187k 2,563k +6.29 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Ke2 46.Kb6 Ke1 47.Ka5 Qc7+ 48.Ka4 Ke2 49.Kb3 b6 50.Ka2 Qh2 51.Kb2 Qh1 52.Kb3 Qf1
19/35 00:00 253k 2,750k +5.18 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka5 Qc7+ 46.Ka4 Ke2 47.Kb3 Qh2 48.Kb2 b6 49.Kb3 Qg1 50.Ka2 Qg6 51.Kb3 Qg5 52.Kb2 Kf3 53.Ka2 Ke4 54.Kb2 Qh6 55.Kb3 Qf4 56.Kb2 Qg5
20/36 00:00 260k 2,739k +5.18 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka5 Qc7+ 46.Ka4 Ke2 47.Kb3 Qh2 48.Kb2 b6 49.Kb3 Qg1 50.Ka2 Qe1 51.Kb2 Kf3 52.Ka2 Ke4 53.Kb3 Qc1 54.Ka2 Qd1 55.Kb2 Qe2 56.Ka1 Qe1
21/35 00:00 423k 2,765k +2.38 40. ... Qg5+ 41.Ke8 Qh5 42.Kf8 Qh8+ 43.Ke7 Qe5+ 44.Kd8 Qf6+ 45.Ke8 Qe6+ 46.Kf8 Qe5
22/35 00:00 658k 2,786k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8
23/13 00:00 664k 2,780k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8 Qe6+ 44.Kf8 Qe4 45.Kg8 Qg6+ 46.Kf8
24/13 00:00 677k 2,787k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8
25/25 00:00 690k 2,795k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qd6+ 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
26/25 00:00 702k 2,798k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qd6+ 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8
27/25 00:00 731k 2,801k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qd6+ 51.Ke8 Ke6 52.Nc2
28/25 00:00 756k 2,809k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
29/25 00:00 785k 2,813k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8
30/36 00:00 819k 2,816k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8
31/25 00:00 860k 2,802k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
32/25 00:00 913k 2,800k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
33/43 00:00 1,041k 2,830k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
34/41 00:00 1,118k 2,851k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qg4+ 46.Kh8 Qf5 47.Kg7
35/28 00:00 1,175k 2,853k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qg4+ 46.Kh8 Qh4+ 47.Kg8 Qg5+ 48.Kh8
36/25 00:00 1,234k 2,869k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
37/25 00:00 1,298k 2,884k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Qe5 45.Kg8 Qg5+ 46.Kh8 Qf6+ 47.Kg8 Qg6+ 48.Kf8 Kf4 49.Ke7 Qe4+ 50.Kd8 Qf5 51.Ke7 Qe4+
38/43 00:00 1,371k 2,898k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
39/46 00:00 1,607k 2,955k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd8 Qd6+ 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
40/44 00:00 1,799k 3,028k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
41/25 00:00 1,901k 3,051k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
42/47 00:00 2,124k 3,110k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
43/55 00:00 2,377k 3,178k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
44/25 00:00 2,570k 3,237k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
45/25 00:00 2,851k 3,307k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
46/50 00:00 3,048k 3,350k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
47/25 00:01 3,452k 3,441k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8
48/25 00:01 3,716k 3,479k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
49/58 00:01 4,391k 3,579k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
50/25 00:01 6,189k 3,729k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
51/25 00:01 7,087k 3,800k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
52/25 00:02 7,802k 3,851k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qd7 46.Kf6 Qf5+ 47.Kg7 Qg5+ 48.Kh7 Qf6 49.Kg8 Qg6+ 50.Kf8 Qf6
53/60 00:02 9,696k 3,924k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8
54/25 00:03 12,791k 4,017k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kf8 Ke4
55/25+ 00:03 13,048k 4,001k +0.10 40. ... Qg5+
55/25+ 00:03 13,441k 3,970k +0.20 40. ... Qg5+
55/25+ 00:03 13,651k 3,957k +0.35 40. ... Qg5+
55/51 00:03 13,823k 3,952k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8
56/25+ 00:03 13,924k 3,940k +0.10 40. ... Qg5+
56/25+ 00:03 14,023k 3,936k +0.20 40. ... Qg5+
56/25 00:03 14,458k 3,930k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kf8
57/25+ 00:03 14,553k 3,925k +0.10 40. ... Qg5+
57/68+ 00:03 14,592k 3,925k +0.20 40. ... Qg5+
57/68 00:04 16,019k 3,980k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qg4+ 46.Kh8 Qf5 47.Kg7
58/25+ 00:04 16,041k 3,979k +0.10 40. ... Qg5+
58/25 00:04 17,192k 4,022k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
59/25+ 00:04 17,733k 4,034k +0.10 40. ... Qg5+
59/25 00:04 19,179k 4,082k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Qd7 45.Kg8 Qg4+ 46.Kh8 Qh4+ 47.Kg8 Qg5+ 48.Kh8 Qf6+ 49.Kg8
60/25+ 00:04 19,951k 4,106k +0.10 40. ... Qg5+
60/25+ 00:04 20,379k 4,110k +0.20 40. ... Qg5+
60/25+ 00:04 20,478k 4,110k +0.34 40. ... Qg5+
60/25+ 00:05 20,544k 4,109k +0.54 40. ... Qg5+
60/38+ 00:05 20,704k 4,108k +0.82 40. ... Qg5+
60/38+ 00:05 20,881k 4,108k +1.18 40. ... Qg5+
60/38+ 00:05 21,154k 4,108k +1.65 40. ... Qg5+
60/38+ 00:05 21,617k 4,111k +2.27 40. ... Qg5+
60/38+ 00:05 22,218k 4,116k +3.06 40. ... Qg5+
60/38+ 00:05 23,051k 4,121k +4.07 40. ... Qg5+
60/38+ 00:05 23,978k 4,076k +5.35 40. ... Qg5+
60/41+ 00:06 25,672k 4,087k +6.97 40. ... Qg5+
60/55+ 00:08 35,047k 4,215k +9.02 40. ... Qg5+
60/55+ 00:08 37,779k 4,263k +11.61 40. ... Qg5+
60/55+ 00:09 40,686k 4,314k +14.86 40. ... Qg5+
60/55+ 00:09 42,447k 4,335k +18.95 40. ... Qg5+
60/55+ 00:10 48,147k 4,417k +24.08 40. ... Qg5+
60/55+ 00:12 56,448k 4,510k +30.52 40. ... Qg5+
60/55+ 00:12 57,829k 4,519k +47.95 40. ... Qg5+
60/55+ 00:12 58,065k 4,520k +58.90 40. ... Qg5+
60/134+ 00:14 63,827k 4,487k +71.55 40. ... Qg5+
60/134+ 00:14 64,279k 4,484k +M60 40. ... Qg5+
60/134 00:14 67,477k 4,514k +M34 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Ke4 44.f8Q Qxf8 45.Kxb6 Qc8 46.Ka5 b6+ 47.Ka4 Qe6 48.Kb3 Kf3 49.Nc2 dxc2 50.Kxc2 Qxc4 51.Kb2 Ke2 52.d4 Qxb5+ 53.Kc1 cxd4 54.Na3 Qd3 55.Kb2 dxc3+ 56.Kb3 c2+ 57.Kb2 c1Q+ 58.Kxc1 Qxa3+ 59.Kc2 Qd3+ 60.Kb2 Qd4+ 61.Kc2 Qd1+ 62.Kb2 Qd3 63.Ka1 Qd4+ 64.Ka2 Kd3
61/52 00:26 135,195k 5,170k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
62/38 00:26 135,861k 5,168k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
63/38 00:26 137,068k 5,166k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
64/38 00:26 138,598k 5,175k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
65/38 00:27 140,739k 5,175k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
66/38 00:27 141,974k 5,174k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
67/38 00:27 144,525k 5,181k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
68/44 00:46 272,779k 5,812k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
69/38 00:47 273,305k 5,813k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
70/38 00:47 277,874k 5,833k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
71/38 00:47 278,119k 5,834k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
72/38 00:47 278,440k 5,834k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
73/38 00:48 282,118k 5,843k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
74/38 00:48 282,386k 5,843k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
75/38 00:48 286,679k 5,852k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
76/38 00:49 290,321k 5,863k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
77/38 00:50 299,914k 5,891k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
78/38 00:52 312,616k 5,926k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
79/38 00:53 316,677k 5,928k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
80/38 00:58 345,193k 5,938k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
81/38 01:06 397,857k 6,000k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
82/38 01:07 402,037k 5,989k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
83/38 01:10 422,497k 5,955k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
84/38 01:19 465,520k 5,891k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
85/38 01:20 472,144k 5,884k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
86/38 01:25 497,719k 5,848k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
87/38 01:28 517,129k 5,837k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
88/38 01:33 541,120k 5,812k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
89/38 01:35 556,526k 5,827k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
90/38 01:42 602,773k 5,871k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
91/38 01:56 692,951k 5,924k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
92/38 02:11 804,505k 6,122k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+

stockfish miss 51.Kf8 Kg6 52.Nc2 or 52.Kg8 with a draw by the 50 move rule.

The initial position is from a study by N.Elkies and it shows that you cannot trust stockfish to handle the 50 move correctly and that it even can show false mate scores.

Note that I used 3 cores and stockfish is not deterministic with 3 cores so it can show also 0.00 but basically you cannot trust mate scores of stockfish to be correct.

Note that I am not convinced that the study is correct and maybe black can win faster without a draw by the 50 move rule but unfortunately I know no engine that can help to prove that the study is correct and if I cannot trust even mate scores then mate score in some different line also prove nothing.

I did not find a way to progress faster and force a win but not finding a faster way is not a proof because maybe there is something that I missed.

User avatar
MikeB
Posts: 4043
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Location: Pen Argyl, Pennsylvania

Re: A wrong mate score by stockfish because 50 move rule

Post by MikeB » Fri Oct 25, 2019 1:00 pm

Uri Blass wrote:
Fri Oct 25, 2019 12:23 am


I analyze the position after 40.Ke7 and get a wrong mate score

FEN: 8/1p2KP2/1p4q1/1Pp5/2P5/N1Pp1k2/3P4/1N6 b - - 76 40

Stockfish_19102310_x64_modern:
1/8 00:00 633 317k +1.82 40. ... Qg5+ 41.Ke6 Qh6+ 42.Ke7
2/3 00:00 845 423k +2.10 40. ... Qg5+ 41.Ke6 Qf4
3/6 00:00 1k 542k +2.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kf8 Qf4
4/6 00:00 2k 922k +2.23 40. ... Qg7 41.Ke8 Qe5+ 42.Kf8
5/8 00:00 3k 1,117k +1.61 40. ... Qg5+ 41.Kf8 Qg6 42.Ke7 Qe4+ 43.Kf6 Qf4+ 44.Kg7
6/23 00:00 9k 1,847k +1.64 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kf8 Qh8+ 43.Ke7 Qh7 44.Kf6 Qh6+ 45.Ke7 Qh4+ 46.Ke8 Qe4+ 47.Kf8
7/26 00:00 17k 2,178k 0.00 40. ... Qh7 41.Kf6 Qh4+ 42.Kg7 Qg5+ 43.Kh7 Qf6 44.Kg8 Qg6+ 45.Kf8 Kf4 46.Ke8 Qe6+ 47.Kf8
8/25 00:00 19k 2,062k 0.00 40. ... Qh7 41.Kf6 Qh4+ 42.Kg7 Qg5+ 43.Kh7 Qf6 44.Kg8 Qg6+ 45.Kf8 Kf4 46.Ke8 Qe6+ 47.Kf8
9/20 00:00 21k 2,080k +1.93 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kf8 Qh8+ 43.Ke7 Qh7 44.Ke8 Qe4+ 45.Kd7 Qf4 46.Ke7
10/26 00:00 35k 2,496k +2.54 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kf8 Qf6 47.Kg8 Qg6+ 48.Kf8 Ke5 49.Ke7 Qd6+ 50.Ke8 Ke6 51.f8N+ Kf5 52.Nd7 Qe6+ 53.Kd8
11/26 00:00 37k 2,334k +2.69 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kf8 Qf6 47.Kg8 Qg6+ 48.Kf8 Ke5 49.Ke7 Qd6+ 50.Ke8 Ke6 51.f8N+ Kf5 52.Nd7
12/26 00:00 40k 2,355k +2.87 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kf8 Qf6 47.Kg8 Qg5+ 48.Kf8 Ke5 49.Ke8 Qg6 50.Ke7 Qd6+ 51.Ke8 Ke6 52.f8N+ Kf5 53.Nd7
13/27 00:00 92k 2,364k +5.14 40. ... Qg5+ 41.Ke8 Qh5 42.Ke7 Qe5+ 43.Kd7 Qf6 44.Kc7 Qxf7+ 45.Kxb6 Qe7 46.Ka7 Kf2 47.b6 Qe4 48.Nb5 Qxc4
14/30 00:00 138k 2,470k +4.92 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.b6 Qf7 47.Ka8 Ke2 48.Ka7 Qh7 49.Nb5 Qe4 50.N5a3 Qh1 51.Ka8
15/23 00:00 143k 2,469k +5.28 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.Kb6 Ke2 47.Ka5 Qc7+ 48.Ka4 Qd6 49.Ka5 Qe7 50.Ka4
16/25 00:00 163k 2,547k +5.56 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.b6 Ke2 47.Nb5 Kd1 48.Kb8 Qe4 49.Ka8
17/27 00:00 176k 2,584k +5.86 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.Kb6 Ke2 47.Ka5 Qd8+ 48.Ka4 Qc7 49.Kb3 Qe5 50.Ka4
18/30 00:00 187k 2,563k +6.29 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Ke2 46.Kb6 Ke1 47.Ka5 Qc7+ 48.Ka4 Ke2 49.Kb3 b6 50.Ka2 Qh2 51.Kb2 Qh1 52.Kb3 Qf1
19/35 00:00 253k 2,750k +5.18 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka5 Qc7+ 46.Ka4 Ke2 47.Kb3 Qh2 48.Kb2 b6 49.Kb3 Qg1 50.Ka2 Qg6 51.Kb3 Qg5 52.Kb2 Kf3 53.Ka2 Ke4 54.Kb2 Qh6 55.Kb3 Qf4 56.Kb2 Qg5
20/36 00:00 260k 2,739k +5.18 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka5 Qc7+ 46.Ka4 Ke2 47.Kb3 Qh2 48.Kb2 b6 49.Kb3 Qg1 50.Ka2 Qe1 51.Kb2 Kf3 52.Ka2 Ke4 53.Kb3 Qc1 54.Ka2 Qd1 55.Kb2 Qe2 56.Ka1 Qe1
21/35 00:00 423k 2,765k +2.38 40. ... Qg5+ 41.Ke8 Qh5 42.Kf8 Qh8+ 43.Ke7 Qe5+ 44.Kd8 Qf6+ 45.Ke8 Qe6+ 46.Kf8 Qe5
22/35 00:00 658k 2,786k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8
23/13 00:00 664k 2,780k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8 Qe6+ 44.Kf8 Qe4 45.Kg8 Qg6+ 46.Kf8
24/13 00:00 677k 2,787k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8
25/25 00:00 690k 2,795k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qd6+ 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
26/25 00:00 702k 2,798k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qd6+ 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8
27/25 00:00 731k 2,801k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qd6+ 51.Ke8 Ke6 52.Nc2
28/25 00:00 756k 2,809k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
29/25 00:00 785k 2,813k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8
30/36 00:00 819k 2,816k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8
31/25 00:00 860k 2,802k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
32/25 00:00 913k 2,800k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
33/43 00:00 1,041k 2,830k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
34/41 00:00 1,118k 2,851k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qg4+ 46.Kh8 Qf5 47.Kg7
35/28 00:00 1,175k 2,853k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qg4+ 46.Kh8 Qh4+ 47.Kg8 Qg5+ 48.Kh8
36/25 00:00 1,234k 2,869k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
37/25 00:00 1,298k 2,884k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Qe5 45.Kg8 Qg5+ 46.Kh8 Qf6+ 47.Kg8 Qg6+ 48.Kf8 Kf4 49.Ke7 Qe4+ 50.Kd8 Qf5 51.Ke7 Qe4+
38/43 00:00 1,371k 2,898k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
39/46 00:00 1,607k 2,955k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd8 Qd6+ 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
40/44 00:00 1,799k 3,028k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
41/25 00:00 1,901k 3,051k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
42/47 00:00 2,124k 3,110k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
43/55 00:00 2,377k 3,178k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
44/25 00:00 2,570k 3,237k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
45/25 00:00 2,851k 3,307k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
46/50 00:00 3,048k 3,350k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
47/25 00:01 3,452k 3,441k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8
48/25 00:01 3,716k 3,479k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
49/58 00:01 4,391k 3,579k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
50/25 00:01 6,189k 3,729k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
51/25 00:01 7,087k 3,800k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
52/25 00:02 7,802k 3,851k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qd7 46.Kf6 Qf5+ 47.Kg7 Qg5+ 48.Kh7 Qf6 49.Kg8 Qg6+ 50.Kf8 Qf6
53/60 00:02 9,696k 3,924k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8
54/25 00:03 12,791k 4,017k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kf8 Ke4
55/25+ 00:03 13,048k 4,001k +0.10 40. ... Qg5+
55/25+ 00:03 13,441k 3,970k +0.20 40. ... Qg5+
55/25+ 00:03 13,651k 3,957k +0.35 40. ... Qg5+
55/51 00:03 13,823k 3,952k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8
56/25+ 00:03 13,924k 3,940k +0.10 40. ... Qg5+
56/25+ 00:03 14,023k 3,936k +0.20 40. ... Qg5+
56/25 00:03 14,458k 3,930k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kf8
57/25+ 00:03 14,553k 3,925k +0.10 40. ... Qg5+
57/68+ 00:03 14,592k 3,925k +0.20 40. ... Qg5+
57/68 00:04 16,019k 3,980k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qg4+ 46.Kh8 Qf5 47.Kg7
58/25+ 00:04 16,041k 3,979k +0.10 40. ... Qg5+
58/25 00:04 17,192k 4,022k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
59/25+ 00:04 17,733k 4,034k +0.10 40. ... Qg5+
59/25 00:04 19,179k 4,082k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Qd7 45.Kg8 Qg4+ 46.Kh8 Qh4+ 47.Kg8 Qg5+ 48.Kh8 Qf6+ 49.Kg8
60/25+ 00:04 19,951k 4,106k +0.10 40. ... Qg5+
60/25+ 00:04 20,379k 4,110k +0.20 40. ... Qg5+
60/25+ 00:04 20,478k 4,110k +0.34 40. ... Qg5+
60/25+ 00:05 20,544k 4,109k +0.54 40. ... Qg5+
60/38+ 00:05 20,704k 4,108k +0.82 40. ... Qg5+
60/38+ 00:05 20,881k 4,108k +1.18 40. ... Qg5+
60/38+ 00:05 21,154k 4,108k +1.65 40. ... Qg5+
60/38+ 00:05 21,617k 4,111k +2.27 40. ... Qg5+
60/38+ 00:05 22,218k 4,116k +3.06 40. ... Qg5+
60/38+ 00:05 23,051k 4,121k +4.07 40. ... Qg5+
60/38+ 00:05 23,978k 4,076k +5.35 40. ... Qg5+
60/41+ 00:06 25,672k 4,087k +6.97 40. ... Qg5+
60/55+ 00:08 35,047k 4,215k +9.02 40. ... Qg5+
60/55+ 00:08 37,779k 4,263k +11.61 40. ... Qg5+
60/55+ 00:09 40,686k 4,314k +14.86 40. ... Qg5+
60/55+ 00:09 42,447k 4,335k +18.95 40. ... Qg5+
60/55+ 00:10 48,147k 4,417k +24.08 40. ... Qg5+
60/55+ 00:12 56,448k 4,510k +30.52 40. ... Qg5+
60/55+ 00:12 57,829k 4,519k +47.95 40. ... Qg5+
60/55+ 00:12 58,065k 4,520k +58.90 40. ... Qg5+
60/134+ 00:14 63,827k 4,487k +71.55 40. ... Qg5+
60/134+ 00:14 64,279k 4,484k +M60 40. ... Qg5+
60/134 00:14 67,477k 4,514k +M34 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Ke4 44.f8Q Qxf8 45.Kxb6 Qc8 46.Ka5 b6+ 47.Ka4 Qe6 48.Kb3 Kf3 49.Nc2 dxc2 50.Kxc2 Qxc4 51.Kb2 Ke2 52.d4 Qxb5+ 53.Kc1 cxd4 54.Na3 Qd3 55.Kb2 dxc3+ 56.Kb3 c2+ 57.Kb2 c1Q+ 58.Kxc1 Qxa3+ 59.Kc2 Qd3+ 60.Kb2 Qd4+ 61.Kc2 Qd1+ 62.Kb2 Qd3 63.Ka1 Qd4+ 64.Ka2 Kd3
61/52 00:26 135,195k 5,170k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
62/38 00:26 135,861k 5,168k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
63/38 00:26 137,068k 5,166k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
64/38 00:26 138,598k 5,175k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
65/38 00:27 140,739k 5,175k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
66/38 00:27 141,974k 5,174k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
67/38 00:27 144,525k 5,181k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
68/44 00:46 272,779k 5,812k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
69/38 00:47 273,305k 5,813k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
70/38 00:47 277,874k 5,833k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
71/38 00:47 278,119k 5,834k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
72/38 00:47 278,440k 5,834k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
73/38 00:48 282,118k 5,843k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
74/38 00:48 282,386k 5,843k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
75/38 00:48 286,679k 5,852k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
76/38 00:49 290,321k 5,863k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
77/38 00:50 299,914k 5,891k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
78/38 00:52 312,616k 5,926k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
79/38 00:53 316,677k 5,928k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
80/38 00:58 345,193k 5,938k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
81/38 01:06 397,857k 6,000k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
82/38 01:07 402,037k 5,989k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
83/38 01:10 422,497k 5,955k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
84/38 01:19 465,520k 5,891k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
85/38 01:20 472,144k 5,884k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
86/38 01:25 497,719k 5,848k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
87/38 01:28 517,129k 5,837k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
88/38 01:33 541,120k 5,812k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
89/38 01:35 556,526k 5,827k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
90/38 01:42 602,773k 5,871k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
91/38 01:56 692,951k 5,924k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
92/38 02:11 804,505k 6,122k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+

stockfish miss 51.Kf8 Kg6 52.Nc2 or 52.Kg8 with a draw by the 50 move rule.

The initial position is from a study by N.Elkies and it shows that you cannot trust stockfish to handle the 50 move correctly and that it even can show false mate scores.

Note that I used 3 cores and stockfish is not deterministic with 3 cores so it can show also 0.00 but basically you cannot trust mate scores of stockfish to be correct.

Note that I am not convinced that the study is correct and maybe black can win faster without a draw by the 50 move rule but unfortunately I know no engine that can help to prove that the study is correct and if I cannot trust even mate scores then mate score in some different line also prove nothing.

I did not find a way to progress faster and force a win but not finding a faster way is not a proof because maybe there is something that I missed.
User error.

Engines are not designed to be used like that . FENs do not capture 3 fold move repetitions, so you must always enter the prior moves to correctly determine draws. Stockfish handles it correctly from your initial position. Komodo has the same "issue" which is not an issue, it's a defect when using FENs.
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MikeB
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Re: A wrong mate score by stockfish because 50 move rule

Post by MikeB » Fri Oct 25, 2019 1:00 pm

Uri Blass wrote:
Fri Oct 25, 2019 12:23 am


I analyze the position after 40.Ke7 and get a wrong mate score

FEN: 8/1p2KP2/1p4q1/1Pp5/2P5/N1Pp1k2/3P4/1N6 b - - 76 40

Stockfish_19102310_x64_modern:
1/8 00:00 633 317k +1.82 40. ... Qg5+ 41.Ke6 Qh6+ 42.Ke7
2/3 00:00 845 423k +2.10 40. ... Qg5+ 41.Ke6 Qf4
3/6 00:00 1k 542k +2.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kf8 Qf4
4/6 00:00 2k 922k +2.23 40. ... Qg7 41.Ke8 Qe5+ 42.Kf8
5/8 00:00 3k 1,117k +1.61 40. ... Qg5+ 41.Kf8 Qg6 42.Ke7 Qe4+ 43.Kf6 Qf4+ 44.Kg7
6/23 00:00 9k 1,847k +1.64 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kf8 Qh8+ 43.Ke7 Qh7 44.Kf6 Qh6+ 45.Ke7 Qh4+ 46.Ke8 Qe4+ 47.Kf8
7/26 00:00 17k 2,178k 0.00 40. ... Qh7 41.Kf6 Qh4+ 42.Kg7 Qg5+ 43.Kh7 Qf6 44.Kg8 Qg6+ 45.Kf8 Kf4 46.Ke8 Qe6+ 47.Kf8
8/25 00:00 19k 2,062k 0.00 40. ... Qh7 41.Kf6 Qh4+ 42.Kg7 Qg5+ 43.Kh7 Qf6 44.Kg8 Qg6+ 45.Kf8 Kf4 46.Ke8 Qe6+ 47.Kf8
9/20 00:00 21k 2,080k +1.93 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kf8 Qh8+ 43.Ke7 Qh7 44.Ke8 Qe4+ 45.Kd7 Qf4 46.Ke7
10/26 00:00 35k 2,496k +2.54 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kf8 Qf6 47.Kg8 Qg6+ 48.Kf8 Ke5 49.Ke7 Qd6+ 50.Ke8 Ke6 51.f8N+ Kf5 52.Nd7 Qe6+ 53.Kd8
11/26 00:00 37k 2,334k +2.69 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kf8 Qf6 47.Kg8 Qg6+ 48.Kf8 Ke5 49.Ke7 Qd6+ 50.Ke8 Ke6 51.f8N+ Kf5 52.Nd7
12/26 00:00 40k 2,355k +2.87 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kf8 Qf6 47.Kg8 Qg5+ 48.Kf8 Ke5 49.Ke8 Qg6 50.Ke7 Qd6+ 51.Ke8 Ke6 52.f8N+ Kf5 53.Nd7
13/27 00:00 92k 2,364k +5.14 40. ... Qg5+ 41.Ke8 Qh5 42.Ke7 Qe5+ 43.Kd7 Qf6 44.Kc7 Qxf7+ 45.Kxb6 Qe7 46.Ka7 Kf2 47.b6 Qe4 48.Nb5 Qxc4
14/30 00:00 138k 2,470k +4.92 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.b6 Qf7 47.Ka8 Ke2 48.Ka7 Qh7 49.Nb5 Qe4 50.N5a3 Qh1 51.Ka8
15/23 00:00 143k 2,469k +5.28 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.Kb6 Ke2 47.Ka5 Qc7+ 48.Ka4 Qd6 49.Ka5 Qe7 50.Ka4
16/25 00:00 163k 2,547k +5.56 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.b6 Ke2 47.Nb5 Kd1 48.Kb8 Qe4 49.Ka8
17/27 00:00 176k 2,584k +5.86 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Kf2 46.Kb6 Ke2 47.Ka5 Qd8+ 48.Ka4 Qc7 49.Kb3 Qe5 50.Ka4
18/30 00:00 187k 2,563k +6.29 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Ke2 46.Kb6 Ke1 47.Ka5 Qc7+ 48.Ka4 Ke2 49.Kb3 b6 50.Ka2 Qh2 51.Kb2 Qh1 52.Kb3 Qf1
19/35 00:00 253k 2,750k +5.18 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka5 Qc7+ 46.Ka4 Ke2 47.Kb3 Qh2 48.Kb2 b6 49.Kb3 Qg1 50.Ka2 Qg6 51.Kb3 Qg5 52.Kb2 Kf3 53.Ka2 Ke4 54.Kb2 Qh6 55.Kb3 Qf4 56.Kb2 Qg5
20/36 00:00 260k 2,739k +5.18 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka5 Qc7+ 46.Ka4 Ke2 47.Kb3 Qh2 48.Kb2 b6 49.Kb3 Qg1 50.Ka2 Qe1 51.Kb2 Kf3 52.Ka2 Ke4 53.Kb3 Qc1 54.Ka2 Qd1 55.Kb2 Qe2 56.Ka1 Qe1
21/35 00:00 423k 2,765k +2.38 40. ... Qg5+ 41.Ke8 Qh5 42.Kf8 Qh8+ 43.Ke7 Qe5+ 44.Kd8 Qf6+ 45.Ke8 Qe6+ 46.Kf8 Qe5
22/35 00:00 658k 2,786k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8
23/13 00:00 664k 2,780k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8 Qe6+ 44.Kf8 Qe4 45.Kg8 Qg6+ 46.Kf8
24/13 00:00 677k 2,787k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8
25/25 00:00 690k 2,795k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qd6+ 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
26/25 00:00 702k 2,798k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qd6+ 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8
27/25 00:00 731k 2,801k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qd6+ 51.Ke8 Ke6 52.Nc2
28/25 00:00 756k 2,809k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
29/25 00:00 785k 2,813k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8
30/36 00:00 819k 2,816k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8
31/25 00:00 860k 2,802k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
32/25 00:00 913k 2,800k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
33/43 00:00 1,041k 2,830k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
34/41 00:00 1,118k 2,851k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qg4+ 46.Kh8 Qf5 47.Kg7
35/28 00:00 1,175k 2,853k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qg4+ 46.Kh8 Qh4+ 47.Kg8 Qg5+ 48.Kh8
36/25 00:00 1,234k 2,869k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
37/25 00:00 1,298k 2,884k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Qe5 45.Kg8 Qg5+ 46.Kh8 Qf6+ 47.Kg8 Qg6+ 48.Kf8 Kf4 49.Ke7 Qe4+ 50.Kd8 Qf5 51.Ke7 Qe4+
38/43 00:00 1,371k 2,898k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
39/46 00:00 1,607k 2,955k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd8 Qd6+ 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
40/44 00:00 1,799k 3,028k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
41/25 00:00 1,901k 3,051k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
42/47 00:00 2,124k 3,110k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
43/55 00:00 2,377k 3,178k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
44/25 00:00 2,570k 3,237k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
45/25 00:00 2,851k 3,307k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
46/50 00:00 3,048k 3,350k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
47/25 00:01 3,452k 3,441k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe5+ 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8
48/25 00:01 3,716k 3,479k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
49/58 00:01 4,391k 3,579k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Ke5 50.Ke7 Qe6+ 51.Kf8
50/25 00:01 6,189k 3,729k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
51/25 00:01 7,087k 3,800k 0.00 40. ... Qg7 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
52/25 00:02 7,802k 3,851k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qd7 46.Kf6 Qf5+ 47.Kg7 Qg5+ 48.Kh7 Qf6 49.Kg8 Qg6+ 50.Kf8 Qf6
53/60 00:02 9,696k 3,924k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8
54/25 00:03 12,791k 4,017k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd8 Qf6+ 43.Ke8 Qe6+ 44.Kf8 Ke4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kf8 Ke4
55/25+ 00:03 13,048k 4,001k +0.10 40. ... Qg5+
55/25+ 00:03 13,441k 3,970k +0.20 40. ... Qg5+
55/25+ 00:03 13,651k 3,957k +0.35 40. ... Qg5+
55/51 00:03 13,823k 3,952k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8
56/25+ 00:03 13,924k 3,940k +0.10 40. ... Qg5+
56/25+ 00:03 14,023k 3,936k +0.20 40. ... Qg5+
56/25 00:03 14,458k 3,930k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kf8
57/25+ 00:03 14,553k 3,925k +0.10 40. ... Qg5+
57/68+ 00:03 14,592k 3,925k +0.20 40. ... Qg5+
57/68 00:04 16,019k 3,980k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qg4+ 46.Kh8 Qf5 47.Kg7
58/25+ 00:04 16,041k 3,979k +0.10 40. ... Qg5+
58/25 00:04 17,192k 4,022k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8
59/25+ 00:04 17,733k 4,034k +0.10 40. ... Qg5+
59/25 00:04 19,179k 4,082k 0.00 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Qd7 45.Kg8 Qg4+ 46.Kh8 Qh4+ 47.Kg8 Qg5+ 48.Kh8 Qf6+ 49.Kg8
60/25+ 00:04 19,951k 4,106k +0.10 40. ... Qg5+
60/25+ 00:04 20,379k 4,110k +0.20 40. ... Qg5+
60/25+ 00:04 20,478k 4,110k +0.34 40. ... Qg5+
60/25+ 00:05 20,544k 4,109k +0.54 40. ... Qg5+
60/38+ 00:05 20,704k 4,108k +0.82 40. ... Qg5+
60/38+ 00:05 20,881k 4,108k +1.18 40. ... Qg5+
60/38+ 00:05 21,154k 4,108k +1.65 40. ... Qg5+
60/38+ 00:05 21,617k 4,111k +2.27 40. ... Qg5+
60/38+ 00:05 22,218k 4,116k +3.06 40. ... Qg5+
60/38+ 00:05 23,051k 4,121k +4.07 40. ... Qg5+
60/38+ 00:05 23,978k 4,076k +5.35 40. ... Qg5+
60/41+ 00:06 25,672k 4,087k +6.97 40. ... Qg5+
60/55+ 00:08 35,047k 4,215k +9.02 40. ... Qg5+
60/55+ 00:08 37,779k 4,263k +11.61 40. ... Qg5+
60/55+ 00:09 40,686k 4,314k +14.86 40. ... Qg5+
60/55+ 00:09 42,447k 4,335k +18.95 40. ... Qg5+
60/55+ 00:10 48,147k 4,417k +24.08 40. ... Qg5+
60/55+ 00:12 56,448k 4,510k +30.52 40. ... Qg5+
60/55+ 00:12 57,829k 4,519k +47.95 40. ... Qg5+
60/55+ 00:12 58,065k 4,520k +58.90 40. ... Qg5+
60/134+ 00:14 63,827k 4,487k +71.55 40. ... Qg5+
60/134+ 00:14 64,279k 4,484k +M60 40. ... Qg5+
60/134 00:14 67,477k 4,514k +M34 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Ke4 44.f8Q Qxf8 45.Kxb6 Qc8 46.Ka5 b6+ 47.Ka4 Qe6 48.Kb3 Kf3 49.Nc2 dxc2 50.Kxc2 Qxc4 51.Kb2 Ke2 52.d4 Qxb5+ 53.Kc1 cxd4 54.Na3 Qd3 55.Kb2 dxc3+ 56.Kb3 c2+ 57.Kb2 c1Q+ 58.Kxc1 Qxa3+ 59.Kc2 Qd3+ 60.Kb2 Qd4+ 61.Kc2 Qd1+ 62.Kb2 Qd3 63.Ka1 Qd4+ 64.Ka2 Kd3
61/52 00:26 135,195k 5,170k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
62/38 00:26 135,861k 5,168k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
63/38 00:26 137,068k 5,166k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
64/38 00:26 138,598k 5,175k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
65/38 00:27 140,739k 5,175k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
66/38 00:27 141,974k 5,174k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
67/38 00:27 144,525k 5,181k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kg4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh8 Qf6+ 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
68/44 00:46 272,779k 5,812k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
69/38 00:47 273,305k 5,813k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
70/38 00:47 277,874k 5,833k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
71/38 00:47 278,119k 5,834k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
72/38 00:47 278,440k 5,834k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
73/38 00:48 282,118k 5,843k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
74/38 00:48 282,386k 5,843k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
75/38 00:48 286,679k 5,852k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
76/38 00:49 290,321k 5,863k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
77/38 00:50 299,914k 5,891k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
78/38 00:52 312,616k 5,926k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
79/38 00:53 316,677k 5,928k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
80/38 00:58 345,193k 5,938k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
81/38 01:06 397,857k 6,000k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
82/38 01:07 402,037k 5,989k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
83/38 01:10 422,497k 5,955k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
84/38 01:19 465,520k 5,891k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
85/38 01:20 472,144k 5,884k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
86/38 01:25 497,719k 5,848k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
87/38 01:28 517,129k 5,837k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
88/38 01:33 541,120k 5,812k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
89/38 01:35 556,526k 5,827k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
90/38 01:42 602,773k 5,871k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
91/38 01:56 692,951k 5,924k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+
92/38 02:11 804,505k 6,122k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+

stockfish miss 51.Kf8 Kg6 52.Nc2 or 52.Kg8 with a draw by the 50 move rule.

The initial position is from a study by N.Elkies and it shows that you cannot trust stockfish to handle the 50 move correctly and that it even can show false mate scores.

Note that I used 3 cores and stockfish is not deterministic with 3 cores so it can show also 0.00 but basically you cannot trust mate scores of stockfish to be correct.

Note that I am not convinced that the study is correct and maybe black can win faster without a draw by the 50 move rule but unfortunately I know no engine that can help to prove that the study is correct and if I cannot trust even mate scores then mate score in some different line also prove nothing.

I did not find a way to progress faster and force a win but not finding a faster way is not a proof because maybe there is something that I missed.
User error.

Engines are not designed to be used like that . FENs do not capture 3 fold move repetitions, so you must always enter the prior moves to correctly determine draws. Stockfish handles it correctly from your initial position. Komodo has the same "issue" which is not an issue, it's a known defect when using FENs.
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User avatar
MikeB
Posts: 4043
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Location: Pen Argyl, Pennsylvania

Re: A wrong mate score by stockfish because 50 move rule

Post by MikeB » Fri Oct 25, 2019 1:43 pm

MikeB wrote:
Fri Oct 25, 2019 1:00 pm

User error.

Engines are not designed to be used like that . FENs do not capture 3 fold move repetitions, so you must always enter the prior moves to correctly determine draws. Stockfish handles it correctly from your initial position. Komodo has the same "issue" which is not an issue, it's a known defect when using FENs.
I withdraw this comment - this is something really strange about this position. It has nothing to do with the issue mentioend above - all though that is an issue with FEN. I agree with URI now - I'm not sure what the correct result is.

As an example,

I walked Stockfish from the initial study position - from move 1 to move 38 , it sees mate.



73 #-20 6.87G 3:40.87 Kf8 Kf3 Ke7 Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Ke5 Ke7 Qe6+ Kd8 Qxf7 Kc8 Kd6 Kb8 Qd7 Nc2 dxc2 Na3 Qc7+ Ka8 Qc8+ Ka7 Kc7 Nxc2 Qb8#



still sees mate

dep score nodes time (not shown: tbhits knps seldep)
78 #-13 193.3M 0:04.69 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Ke5 Ke7 Qe6+ Kd8 Qxf7 Kc8 Kd6 Kb8 Qe7 Nc2 dxc2 Na3 Qc7+ Ka8 Qc8+ Ka7 Kc7 Nxc2 Qb8#

bingo, now sees draw



dep score nodes time (not shown: tbhits knps seldep)
63 0.00 1.81G 0:34.74 Qg5+ Kh7 Qh5+ Kg7 Qe5+ Kg8 Qe6 Kg7
62 0.00 1.64G 0:31.46 Qg5+ Kh7 Qh5+ Kg7 Qe5+ Kg8 Qe6 Kg7

something is fishy here ..
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Jouni
Posts: 2121
Joined: Wed Mar 08, 2006 7:15 pm

Re: A wrong mate score by stockfish because 50 move rule

Post by Jouni » Fri Oct 25, 2019 3:40 pm

I asked just 2 days ago if SF can see draw by 50 move after 100 plies, but didn't get any answers. Test position

6k1/8/6p1/8/5r2/1Q6/8/6K1 b - - 1 60
Jouni

Uri Blass
Posts: 8764
Joined: Wed Mar 08, 2006 11:37 pm
Location: Tel-Aviv Israel

Re: A wrong mate score by stockfish because 50 move rule

Post by Uri Blass » Fri Oct 25, 2019 9:28 pm

Jouni wrote:
Fri Oct 25, 2019 3:40 pm
I asked just 2 days ago if SF can see draw by 50 move after 100 plies, but didn't get any answers. Test position

6k1/8/6p1/8/5r2/1Q6/8/6K1 b - - 1 60

For your question I guess stockfish cannot search 100 plies forward or does not see draw score.

I do not know but I tried many plies later at move 92 of the following game and got some huge branching factor when I analyze move 92 from clear hash tables for some reason with no 0.00 score.

5155 knodes for depth 27 and 468300 knodes to finish depth 28(branching factor of 468300/5155>90)
It seems that I get again a big branching factor at depth 33.

I can imagine the branching factor is even clearly higher if you try from the root position and the idea is that
you may get depth 90 in 1 hour only to wait 10000 hours to get depth 91 and still not get a draw score.





Stockfish_19102310_x64_modern:
1/2 00:00 302 151k +2.14 92.Qe7+ Kh6
2/4 00:00 722 361k +2.14 92.Qe7+ Kh6 93.Qe3+ Kh5
3/6 00:00 1k 564k +1.99 92.Qe7+ Kh6 93.Qe3+ Rg5+ 94.Kf3 Kh5
4/8 00:00 1k 745k +2.06 92.Qe7+ Kh6 93.Qe3+ Kh5 94.Qd4 Rg5+ 95.Kf4
5/8 00:00 3k 955k +2.26 92.Qe7+ Kh6 93.Qe3+ Kh5 94.Qd4
6/34 00:00 21k 1,786k +1.93 92.Kh4 Rf8 93.Qd3 Kh7 94.Kg4
7/40 00:00 85k 1,982k +1.55 92.Qe7+ Kh6 93.Qd7 Rg5+ 94.Kf3 Rf5+ 95.Ke2 Rh5 96.Qc6 Rf5 97.Qe6
8/39 00:00 144k 2,083k +1.48 92.Qe7+ Kh6 93.Qb7 Rg5+ 94.Kf3 Rf5+ 95.Ke3 Rg5 96.Qb2 Rh5 97.Qa1 Rf5 98.Qh8+ Kg5
9/40 00:00 191k 2,166k +1.38 92.Qe7+ Kh6 93.Qb7 Rg5+ 94.Kf3 Rf5+ 95.Ke2 Rh5 96.Ke3 Rg5 97.Qb2 Rf5 98.Qc3
10/40 00:00 259k 2,198k +1.27 92.Qe7+ Kh6 93.Kg4 Rh5 94.Qf6 Kh7 95.Qd4 Rf5 96.Kh4 Kg8 97.Qd7 Rh5+ 98.Kg3 Rf5 99.Qe7 Rh5 100.Qe3 Kh7
11/38 00:00 286k 2,186k +1.26 92.Qe7+ Kh6 93.Qe3+ Kg7 94.Qd4+ Kf8 95.Qd6+ Kg7 96.Qd8 Rh5 97.Qe7+ Kh6 98.Qc7
12/40 00:00 385k 2,267k +1.38 92.Qe7+ Kh6 93.Qe3+ Kg7 94.Qd4+ Kf7 95.Kg4 Rh5 96.Qd7+ Kf6 97.Qd8+ Kg7 98.Qe7+ Kh6 99.Qf8+ Kh7 100.Qf6
13/40 00:00 729k 2,447k +1.00 92.Qe7+ Kh6 93.Kg4 Rh5 94.Qf6 Kh7 95.Kg3 Rf5 96.Qd8 Kg7 97.Qd7+ Kh6 98.Qe7 Rg5+ 99.Kf2 Rf5+ 100.Ke2 Rd5 101.Qf6 Rb5 102.Qf8+ Kg5 103.Qh8 Rd5
14/39 00:00 767k 2,458k +1.16 92.Qe7+ Kh6 93.Qe3+ Kg7 94.Qc3+ Kf7 95.Qc7+ Kf6 96.Qd8+ Kf7 97.Kh3 Kg7 98.Qe7+ Kh6 99.Kg3 Rg5+ 100.Kf2 Rf5+ 101.Ke2 Rd5 102.Qf8+ Kg5 103.Qg7
15/40 00:00 1,205k 2,696k +0.95 92.Qe7+ Kh6 93.Qe3+ Kg7 94.Qe8 Rg5+ 95.Kf3 Rf5+ 96.Kg4 Rh5 97.Qe7+ Kh6 98.Qf8+ Kh7 99.Qf7+ Kh6 100.Qf4+ Kg7 101.Kg3 Rf5 102.Qh4 Kf7 103.Qh6 Rh5 104.Qd2 Kf6 105.Qd4+ Kf7 106.Kg4 Rf5
16/40 00:00 1,312k 2,711k +1.18 92.Qe7+ Kh6 93.Qc7 Rg5+ 94.Kf4 Rh5 95.Ke3 Rf5 96.Ke4 Rh5 97.Qe7 Rf5 98.Qd6 Kg5 99.Qd8+ Kh6 100.Qh8+ Kg5 101.Qg7 Rf1 102.Kd5 Rf2
17/40 00:00 1,689k 2,783k +1.00 92.Qe7+ Kh6 93.Qc7 Rg5+ 94.Kf4 Rd5 95.Ke3 Rh5 96.Qd6 Rf5 97.Qe7 Kh5 98.Qe8 Rf1 99.Qh8+ Kg5 100.Qg8 Rf5 101.Qd8+ Kh5 102.Kd4 Kh6 103.Ke4 Kg7 104.Qd1 Kh6 105.Qc1+ Kg7 106.Qb2+ Kh6
18/40 00:00 2,013k 2,823k +1.00 92.Qe7+ Kh6 93.Qc7 Rg5+ 94.Kf4 Rf5+ 95.Ke4 Rh5 96.Qe7 Rf5 97.Kd4 Rf4+ 98.Ke3 Rf5 99.Qd7 Re5+ 100.Kd3 Rf5 101.Qd4 Kh7 102.Ke4 Rh5 103.Qd8 Rf5 104.Qd1
19/38 00:00 2,140k 2,815k +1.28 92.Qe7+ Kh6 93.Qc7 Rg5+ 94.Kf4 Rh5 95.Qe7 Rf5+ 96.Ke3 Rf1 97.Qh4+ Kg7 98.Qd4+ Kh7 99.Qd7+ Kg8 100.Ke4 Rf5 101.Qc7 Rf7 102.Qc4 Kg7 103.Qd4+ Kh7 104.Ke5 Rf8
20/40 00:01 3,203k 2,790k +1.00 92.Qe7+ Kg8 93.Kg2 Rf7 94.Qd6 Kg7 95.Qe5+ Kg8 96.Kg3 Rf5 97.Qe7 Rf8 98.Qe6+ Rf7 99.Qe8+ Kg7 100.Qe5+ Kh7 101.Qc3 Rf5 102.Kg4 Kg8 103.Qb3+ Kg7 104.Qb7+ Kf6 105.Qa6+ Kg7 106.Qd6 Kf7 107.Qd7+ Kg8
21/38 00:01 3,249k 2,789k +1.00 92.Qe7+ Kg8 93.Kg2 Rf7 94.Qd6 Kg7 95.Qe5+ Kg8 96.Kg3 Rf5 97.Qe7 Rf8 98.Qe6+ Rf7 99.Qc4 Kg7 100.Qc3+ Kh7 101.Qd4 Rf5 102.Qa7+ Kg8 103.Kh4 Rf7 104.Qb8+ Kh7 105.Qe5 Rf5 106.Qc7+ Kg8 107.Qc3 Kf7 108.Kg4
22/40 00:01 3,879k 2,793k +0.90 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kg8 96.Kg1 Rf7 97.Qe8+ Kg7 98.Qe5+ Kh7 99.Qh2+ Kg7 100.Qb2+ Kg8 101.Kg2 Kh7 102.Qa3 Kg7 103.Qe3 Rf5 104.Qb6 Rg5+ 105.Kh3 Rh5+ 106.Kg4 Rf5 107.Qa7+ Kg8 108.Qe7 Rf7 109.Qe5 Rf5
23/38 00:01 3,952k 2,791k +0.90 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kg8 96.Kg1 Rf7 97.Qe8+ Kg7 98.Qe5+ Kh7 99.Qh2+ Kg7 100.Qb2+ Kg8 101.Kg2 Kh7 102.Kh3 Kg8 103.Qc3 Kh7 104.Qe3 Kg8 105.Qe6 Kg7 106.Qe5+ Kh7 107.Kg3 Kg8 108.Qc5 Kh7
24/38 00:01 4,134k 2,788k +0.90 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kg8 96.Kg1 Rf7 97.Qe8+ Kg7 98.Qe5+ Kh7 99.Qh2+ Kg7 100.Qb2+ Kg8 101.Kg2 Rf5 102.Kg3 Kh7 103.Qa1 Rf7 104.Qa8 Kg7 105.Qd5 Rf5 106.Qd7+ Kg8 107.Qd8+ Kg7 108.Kh3 Rf3+ 109.Kg2
25/38 00:01 4,358k 2,795k +0.90 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kg8 96.Kg1 Rf7 97.Qe8+ Kg7 98.Qe5+ Kh7 99.Qh2+ Kg7 100.Qb2+ Kg8 101.Kg2 Kh7 102.Kh2 Kg8 103.Qd2 Rf5 104.Qd7 Rh5+ 105.Kg3 Rg5+ 106.Kf3 Rf5+ 107.Ke3 Rf7 108.Qd4 Kh7 109.Qh4+ Kg7
26/38 00:01 4,440k 2,800k +0.90 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kg8 96.Kg1 Rf7 97.Qe8+ Kg7 98.Qe5+ Kh7 99.Qh2+ Kg7 100.Qb2+ Kg8 101.Kg2 Kh7 102.Qa3 Kg7 103.Qe3 Rf5 104.Qe8 Kh7 105.Qd7+ Kg8 106.Qe7 Rf7 107.Qd6 Kg7 108.Qd4+ Kg8 109.Kg3
27/40 00:01 5,155k 2,840k +0.90 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kg8 96.Kg1 Rf7 97.Qe8+ Kg7 98.Qe5+ Kh7 99.Qh2+ Kg7 100.Qb2+ Kg8 101.Kg2 Kh7 102.Qa3 Kg7 103.Kh3 Kh7 104.Qc3 Kg8 105.Kh4 Rf5 106.Qc1 Kg7 107.Qc7+ Rf7 108.Qc8 Kh7 109.Kg4 Rf5
28/41- 01:42 317,660k 3,099k +0.79 92.Qe7+ Rf7
28/44+ 01:45 326,774k 3,104k +0.90 92.Qe7+
28/44 02:25 468,300k 3,209k +0.79 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kg8 96.Kg1 Kh8 97.Qc7 Kg8 98.Qd8+ Kg7 99.Qd4+ Kg8 100.Kh2 Rh5+ 101.Kg2 Rg5+ 102.Kh3 Rh5+ 103.Kg4 Rf5 104.Kg3 Rg5+ 105.Kf4 Rf5+ 106.Kg4 Kh7 107.Qb6 Kg7 108.Qb8
29/38+ 02:25 468,362k 3,209k +0.90 92.Qe7+
29/38 02:26 468,693k 3,209k +0.79 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kg8 96.Kg1 Kh8 97.Qc7 Kg8 98.Qd8+ Kg7 99.Qh4 Rf7 100.Qg3 Rf5 101.Qc3+ Kg8 102.Kg2 Kh7 103.Kh3 Rf7 104.Qb3 Kg7 105.Kg4 Rf5 106.Qc4 Rf7 107.Qd4+ Kh7 108.Qg1 Rf5
30/38+ 02:26 468,743k 3,209k +0.90 92.Qe7+
30/38 02:26 468,834k 3,209k +0.79 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kg8 96.Kg1 Kh8 97.Qc7 Kg8 98.Qc3 Rf7 99.Qh3 Kg7 100.Qg3 Rf5 101.Qc3+ Kg8 102.Kg2 Kh7 103.Kh3 Rf7 104.Qb3 Kg7 105.Qb2+ Kg8 106.Qd4 Kh7 107.Qb6 Rf3+ 108.Kg4 Rf7 109.Qd6 Rf5
31/38+ 02:26 468,858k 3,209k +0.90 92.Qe7+
31/38 02:26 468,963k 3,208k +0.79 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kg8 96.Kg1 Kh8 97.Qc7 Kg8 98.Qc3 Rf7 99.Qh3 Kg7 100.Qg3 Rf5 101.Qc3+ Kg8 102.Kg2 Kh7 103.Kg3 Rf7 104.Qe5 Rf5 105.Qc7+ Kh8 106.Qc8+ Kg7 107.Qd7+ Rf7 108.Qd2 Kh7 109.Kh4
32/38+ 02:26 469,020k 3,208k +0.90 92.Qe7+
32/45 03:07 602,226k 3,219k +0.79 92.Qe7+ Rf7 93.Qe5+ Kh7 94.Kg2 Rf5 95.Qe7+ Kh8 96.Kh2 Rf2+ 97.Kg1 Rf5 98.Qc7 Kg8 99.Qc3 Kh7 100.Kh2 Rf7 101.Qd4 Kg8 102.Qc4 Kf8 103.Kg3 Kg8 104.Kg4 Kg7 105.Kh4 Rf5 106.Kg3 Kh7 107.Kh3 Rf3+ 108.Kg4 Rf5 109.Qc3 Kg8
33/39+ 03:07 602,294k 3,219k +0.90 92.Qe7+

Uri Blass
Posts: 8764
Joined: Wed Mar 08, 2006 11:37 pm
Location: Tel-Aviv Israel

Re: A wrong mate score by stockfish because 50 move rule

Post by Uri Blass » Fri Oct 25, 2019 10:07 pm

In second try I got bigger depth but no draw score at depth 38 inspite of the fact that 37 plies are enough for a draw by the 50 move rule so
I guess that even 101 plies from the root position are not enough for stockfish to see the draw.

Here is the analysis from clear hash(I used 1024 mbytes hash but I do not believe that bigger hash (of course without tablebases) can help.
Note that again you can see a huge branching factor(this time from depth 28 to depth 29)

I use 3 cores so stockfish is not deterministic with clear hash.




Stockfish_19102310_x64_modern:
1/2 00:00 295 295k +2.14 92.Qe7+ Kh6
2/4 00:00 755 378k +2.14 92.Qe7+ Kh6 93.Qe3+ Kh5
3/6 00:00 1k 593k +1.99 92.Qe7+ Kh6 93.Qe3+ Rg5+ 94.Kf3 Kh5
4/8 00:00 2k 780k +2.06 92.Qe7+ Kh6 93.Qe3+ Kh5 94.Qd4 Rg5+ 95.Kf4
5/38 00:00 52k 2,172k +1.62 92.Qe7+ Kh6 93.Qc7 Rf1 94.Qc4 Rf5 95.Qh4+ Kg7
6/27 00:00 55k 2,205k +2.07 92.Kh4 Rh5+ 93.Kg3 Rf5
7/40 00:00 99k 2,193k +1.61 92.Qe7+ Kh6 93.Qe3+ Kg7 94.Qc3+ Kf8 95.Qc7 Rg5+ 96.Kf2 Rf5+ 97.Ke3 Rf1
8/40 00:00 167k 2,289k +1.36 92.Qe7+ Kh6 93.Qc7 Rg5+ 94.Kf3 Rh5 95.Qe7 Rg5 96.Qa7 Rf5+ 97.Ke2 Kg5
9/38 00:00 177k 2,296k +1.46 92.Qe7+ Kh6 93.Qc7 Rg5+ 94.Kf3 Rh5 95.Qe7 Rf5+ 96.Ke3 Rg5 97.Qf8+ Kh7 98.Qf7+ Kh6 99.Kd4 Rg4+ 100.Kc5
10/40 00:00 341k 2,303k +1.20 92.Qe7+ Kh6 93.Qa7 Rg5+ 94.Kf2 Rf5+ 95.Ke3 Kh5 96.Qe7 Kh6 97.Ke2 Rh5 98.Qe3+ Kg7 99.Qc3+ Kf7 100.Kf2
11/40 00:00 451k 2,360k +1.19 92.Qe7+ Kh6 93.Qa7 Rg5+ 94.Kf4 Rf5+ 95.Ke4 Rh5 96.Kd3 Re5 97.Kc2 Kg5 98.Qg7 Rf5 99.Qe7+ Kg4 100.Qa7 Kg5
12/40 00:00 587k 2,397k +1.19 92.Qe7+ Kh6 93.Qc7 Rg5+ 94.Kf4 Rf5+ 95.Ke4 Rh5 96.Qd8 Rf5 97.Qh8+ Kg5 98.Qg7 Kh5 99.Qh7+ Kg5 100.Qh8 Rf4+ 101.Ke5 Rf7 102.Qd8+ Kh6 103.Qd2+ Kg7 104.Kd5 Rf5+ 105.Ke4 Kf7 106.Qb2 Rh5 107.Qb7+ Kf6
13/40 00:00 651k 2,419k +1.27 92.Qe7+ Kh6 93.Kg2 Rg5+ 94.Kf3 Rf5+ 95.Ke2 Rh5 96.Qf8+ Kh7 97.Kd3 Rf5 98.Qd8 Kh6 99.Qh4+ Kg7 100.Qe7+ Kh6 101.Kd4 Rf3
14/40 00:00 959k 2,492k +1.09 92.Qe7+ Kh6 93.Kg2 Rg5+ 94.Kf3 Rf5+ 95.Ke2 Rh5 96.Kd3 Rf5 97.Kc4 Rf4+ 98.Kc3 Rf3+ 99.Kd2 Rf5 100.Qc7 Kg5 101.Qg7 Ra5 102.Qc3 Rf5 103.Qe3+ Kf6 104.Qb6+ Kg7
15/40 00:00 1,452k 2,482k +0.84 92.Qe7+ Kh6 93.Kg2 Rg5+ 94.Kf3 Rf5+ 95.Ke3 Rh5 96.Qf8+ Kh7 97.Qf7+ Kh6 98.Qf4+ Kg7 99.Qc7+ Kf6 100.Qd8+ Kg7 101.Kf4 Rf5+ 102.Kg4 Rh5 103.Qd2 Rf5 104.Qc3+ Kh7 105.Kg3
16/38 00:00 1,525k 2,476k +0.84 92.Qe7+ Kh6 93.Kg2 Rg5+ 94.Kf3 Rf5+ 95.Ke3 Rh5 96.Ke2 Rf5 97.Qc7 Rh5 98.Kd3 Rf5 99.Ke3 Rd5 100.Qc1 Rf5 101.Qa1
17/40 00:00 1,642k 2,462k +1.13 92.Qe7+ Kh6 93.Kg2 Rg5+ 94.Kf3 Rf5+ 95.Ke3 Rh5 96.Kd3 Rf5 97.Kc4 Rh5 98.Kc3 Rf5 99.Kd3 Rh5 100.Qe3+ Kg7 101.Qa7+ Kf6 102.Qd4+ Kf7 103.Qd7+ Kf6 104.Qc6+ Kf7 105.Qc7+ Kf6 106.Ke4
18/40 00:01 3,306k 2,563k +0.84 92.Qe7+ Kg8 93.Qc7 Rf8 94.Qc4+ Rf7 95.Kh3 Kg7 96.Qd4+ Kg8 97.Qd5 Kg7 98.Qe5+ Kh7 99.Qe8 Kg7 100.Kg4 Rf5 101.Qd7+ Kg8 102.Qd8+ Kh7 103.Qe7+ Kg8 104.Kg3 Rf7 105.Qe3 Kg7 106.Qe5+ Kh7 107.Qb5 Rf5
19/38 00:01 3,386k 2,569k +0.84 92.Qe7+ Kg8 93.Qc7 Rf7 94.Qb8+ Kh7 95.Qe5 Rf5 96.Qc7+ Kg8 97.Qb8+ Kg7 98.Qb2+ Kh7 99.Qb7+ Kg8 100.Kh4 Rh5+ 101.Kg4 Rf5 102.Qd7 Rf7 103.Qd5 Kg7 104.Kh4 Rf5 105.Qd4+ Kg8 106.Qd7 Rh5+ 107.Kg4 Rf5 108.Qd8+ Kf7 109.Qc7+ Kg8
20/38 00:01 3,435k 2,571k +0.84 92.Qe7+ Kg8 93.Qc7 Rf7 94.Qb8+ Kh7 95.Qe5 Rf5 96.Qc7+ Kg8 97.Qb8+ Kg7 98.Qb2+ Kh7 99.Qb7+ Kg8 100.Kh4 Rh5+ 101.Kg4 Rf5 102.Qd7 Rf7 103.Qd5 Kg7 104.Qe5+ Kh7 105.Kh4 Rf5 106.Qe7+ Kg8 107.Qd6 Kf7 108.Qc7+ Kg8 109.Qc4+ Kg7
21/38 00:01 3,481k 2,571k +0.84 92.Qe7+ Kg8 93.Qc7 Rf7 94.Qb8+ Kh7 95.Qe5 Rf8 96.Qe7+ Kg8 97.Qd6 Kg7 98.Qd4+ Kg8 99.Kg4 Rf5 100.Qe3 Kg7 101.Qe7+ Kg8 102.Qe8+ Kg7 103.Qd8 Kh7 104.Qh4+ Kg7 105.Kg3 Rf7 106.Kg2 Rf5 107.Qe7+ Kg8 108.Qe8+ Kg7 109.Qd7+ Kg8
22/38 00:01 3,552k 2,580k +0.84 92.Qe7+ Kg8 93.Qc7 Rf7 94.Qb8+ Kh7 95.Qe5 Rf8 96.Qe7+ Kg8 97.Qd6 Kg7 98.Qd4+ Kg8 99.Kg4 Rf5 100.Qd7 Rf7 101.Qd5 Kg7 102.Qd4+ Kh7 103.Kh4 Rf5 104.Qd7+ Kg8 105.Qe8+ Kg7 106.Qd8 Kf7 107.Kh3 Rh5+ 108.Kg2 Rf5
23/38 00:01 3,614k 2,580k +0.84 92.Qe7+ Kg8 93.Qc7 Rf7 94.Qb8+ Kh7 95.Qe5 Rf8 96.Qd5 Rf5 97.Qd6 Rf7 98.Qd4 Kg8 99.Qe3 Kh7 100.Kg4 Kg7 101.Qd4+ Kh7 102.Kh4 Rf5 103.Qd6 Kg7 104.Qe7+ Kg8 105.Qd8+ Kg7 106.Qd6 Rh5+ 107.Kg3
24/38 00:01 3,674k 2,577k +0.84 92.Qe7+ Kg8 93.Qc7 Rf7 94.Qb8+ Kh7 95.Qe5 Rf8 96.Qd5 Rf5 97.Qd6 Rf7 98.Qd4 Kg8 99.Qe3 Kh7 100.Kg4 Kg7 101.Qd4+ Kh7 102.Qd8 Rf5 103.Qc7+ Kg8 104.Qd6 Kg7 105.Kh4 Kh7 106.Qc7+ Kg8 107.Qc4+ Kg7 108.Qc3+ Kh7 109.Kg3 Rf7
25/38 00:01 3,797k 2,576k +0.84 92.Qe7+ Kg8 93.Qc7 Rf7 94.Qb8+ Kh7 95.Qe5 Rf8 96.Qd5 Rf5 97.Qa8 Rf7 98.Kg4 Rf5 99.Qc6 Kg7 100.Qc2 Kf7 101.Qc3 Kg8 102.Qc4+ Kg7 103.Qd4+ Kh7 104.Qd7+ Kg8 105.Qe8+ Kh7 106.Kg3 Kg7 107.Kg2 Rf7 108.Qe5+ Kg8 109.Qd5 Kg7
26/38 00:01 3,873k 2,575k +0.84 92.Qe7+ Kg8 93.Qc7 Rf7 94.Qb8+ Kh7 95.Qe5 Rf8 96.Qd5 Rf5 97.Qd6 Rf7 98.Kh3 Rf3+ 99.Kh4 Rf5 100.Kg4 Kg7 101.Qd4+ Kh7 102.Qc3 Rf7 103.Qe5 Rf5 104.Qh2+ Kg7 105.Qb2+ Kg8 106.Qb3+ Kg7 107.Qc4 Rf7 108.Kh4 Rf5
27/38 00:01 3,920k 2,572k +0.84 92.Qe7+ Kg8 93.Qc7 Rf7 94.Qb8+ Kh7 95.Qe5 Rf8 96.Qd5 Rf5 97.Qd6 Rf7 98.Kh3 Rf3+ 99.Kh4 Rf5 100.Kg4 Kg7 101.Qd4+ Kh7 102.Qc3 Rf7 103.Qc4 Kg7 104.Kh4 Rf5 105.Qc7+ Kg8 106.Qb8+ Kg7 107.Qa7+ Kg8 108.Qd4 Rh5+ 109.Kg4
28/38 00:01 4,085k 2,580k +0.84 92.Qe7+ Kg8 93.Qc7 Rf7 94.Qb8+ Kh7 95.Qe5 Rf8 96.Qd5 Rf5 97.Qd6 Rf7 98.Kh4 Rf5 99.Kg4 Kg7 100.Qd4+ Kh7 101.Qc3 Rf7 102.Qc4 Kg7 103.Kh4 Rf5 104.Qc1 Rh5+ 105.Kg4 Rf5 106.Qc3+ Kh7 107.Kh4 Rf4+ 108.Kh3 Rf5 109.Qe3 Kg7
29/44- 01:13 255,381k 3,465k +0.73 92.Qe7+ Kg8
29/44+ 01:14 258,548k 3,463k +0.84 92.Qe7+
29/44 01:21 282,224k 3,466k +0.78 92.Qe7+ Kh8 93.Kg4 Kg8 94.Qh4 Kg7 95.Qh2 Rf7 96.Qe5+ Kh7 97.Qc3 Rf5 98.Qc7+ Kh8 99.Qd8+ Kg7 100.Qa8 Rf1 101.Qb7+ Rf7 102.Qb6 Rf5 103.Kg3 Kh7 104.Qe6 Kg7 105.Qe3 Rf8 106.Qg5 Kh7 107.Qd2 Kg7 108.Qa2 Rf5 109.Qh2 Rf1
30/47 03:19 675,307k 3,391k +0.78 92.Qe7+ Kh8 93.Kg4 Kg8 94.Qh4 Kg7 95.Qh2 Rf7 96.Qe5+ Kh7 97.Qc3 Rf5 98.Qc7+ Kh8 99.Qd8+ Kg7 100.Qa8 Rf1 101.Qa3 Rf5 102.Qa7+ Kh8 103.Qc7 Kg8 104.Qc6 Kh7 105.Qc3 Kg8 106.Qd4 Kh7 107.Kg3 Kg8 108.Qd6 Kh7 109.Qe6 Kh8 110.Qxg6 Rf3+ 111.Kh4
31/39 03:19 675,392k 3,390k +0.78 92.Qe7+ Kh8 93.Kg4 Kg8 94.Qh4 Kg7 95.Qh2 Rf7 96.Kh4 Rf5 97.Qc7+ Kg8 98.Kg3 Kh8 99.Qe7 Kg8 100.Qe3 Kh7 101.Kg4 Kg7 102.Qe6 Kh7 103.Kh4 Kh8 104.Qe4 Kg7 105.Qd4+ Kh7 106.Qa7+ Kg8 107.Qa8+ Kg7 108.Kg3 Rf8 109.Qe4 Kh8 110.Qxg6 Rf3+ 111.Kh4
32/41 03:19 675,663k 3,391k +0.78 92.Qe7+ Kh8 93.Kg4 Kg8 94.Qh4 Kg7 95.Qh2 Rf7 96.Kh4 Rf5 97.Qc7+ Kg8 98.Kg3 Kh8 99.Qe7 Kg8 100.Qe3 Kh7 101.Qe6 Kg7 102.Qe8 Rf8 103.Qe7+ Kg8 104.Qd6 Rf7 105.Kh3 Kh7 106.Qe6 Rf1 107.Qe7+ Kg8 108.Qd6 Kh8 109.Kg3 Rf5 110.Qxg6 Rf3+ 111.Kh4
33/43 03:19 676,534k 3,391k +0.78 92.Qe7+ Kh8 93.Kg4 Kg8 94.Qh4 Kg7 95.Qh2 Rf7 96.Kh4 Rf5 97.Qc7+ Kg8 98.Qd7 Kh8 99.Kg4 Kg8 100.Qc8+ Kh7 101.Qb7+ Kg8 102.Qh1 Kg7 103.Kg3 Rf8 104.Qa1+ Kg8 105.Qc3 Rf5 106.Qe3 Kh7 107.Qb3 Kh8 108.Qb6 Kg7 109.Qc6 Kh8 110.Qxg6 Rf3+ 111.Kh4 Rf4+ 112.Kh5 Rh4+ 113.Kg5
34/41 03:19 677,288k 3,391k +0.78 92.Qe7+ Kh8 93.Kg4 Kg8 94.Qh4 Kg7 95.Qh2 Rf7 96.Kh4 Rf5 97.Qc7+ Kg8 98.Kg3 Rf7 99.Qc6 Kh7 100.Qh1+ Kg7 101.Qe4 Rf5 102.Qe8 Kh7 103.Qc8 Kg7 104.Qb8 Rf7 105.Qe5+ Kh7 106.Kh3 Rf3+ 107.Kg4 Rf5 108.Qe3 Kg7 109.Qb6 Kh8 110.Qxg6 Rf4+ 111.Kg3 Rf3+ 112.Kg2
35/41 03:19 677,932k 3,391k +0.78 92.Qe7+ Kh8 93.Kg4 Kg8 94.Qh4 Kg7 95.Qh2 Rf7 96.Kh4 Rf5 97.Qc7+ Kg8 98.Kg3 Rf7 99.Qc6 Kg7 100.Qc3+ Kg8 101.Qe3 Kg7 102.Qd4+ Kh7 103.Qh4+ Kg7 104.Qh3 Rf8 105.Qh2 Rf5 106.Qd2 Kh7 107.Qe3 Kg7 108.Kh4 Kh7 109.Qe6 Kh8 110.Qxg6 Rf4+ 111.Kh3 Rf3+ 112.Kg4
36/48 06:16 1,256,464k 3,339k +0.78 92.Qe7+ Kh8 93.Kg4 Kg8 94.Qh4 Kg7 95.Qh2 Rf7 96.Kh4 Rf5 97.Qc7+ Kg8 98.Kg3 Rf7 99.Qc6 Kg7 100.Qc3+ Kg8 101.Qe3 Kg7 102.Qe5+ Kh7 103.Qc5 Rf5 104.Qd6 Kg7 105.Qd2 Rf8 106.Kg4 Rf7 107.Qd3 Rf5 108.Qe3 Kh7 109.Qe6 Kh8 110.Qxg6 Rf4+ 111.Kg3 Rf3+ 112.Kh4
37/44 06:17 1,259,219k 3,340k +0.78 92.Qe7+ Kh8 93.Kg4 Kg8 94.Qh4 Kg7 95.Qh2 Rf7 96.Kh4 Rf5 97.Qc7+ Kg8 98.Kg3 Rf8 99.Qe7 Rf5 100.Qh4 Kg7 101.Qd8 Kh7 102.Qd6 Kg7 103.Qd2 Rf8 104.Kg4 Rf7 105.Qc3+ Kh7 106.Qc8 Kg7 107.Qe8 Rf5 108.Qe3 Kh7 109.Qe6 Kh8 110.Qxg6 Rf4+ 111.Kg3 Rf3+ 112.Kh2 Rf2+ 113.Kh3
38/41 06:17 1,259,688k 3,340k +0.78 92.Qe7+ Kh8 93.Kg4 Kg8 94.Qh4 Kg7 95.Qh2 Rf7 96.Kh4 Rf5 97.Qc7+ Kg8 98.Kg3 Rf8 99.Qe7 Rf5 100.Qh4 Kg7 101.Qd8 Kh7 102.Qd6 Kg7 103.Qd2 Rf8 104.Kg4 Rf7 105.Qc3+ Kh7 106.Qc5 Rf5 107.Qc1 Kg7 108.Qe3 Kh7 109.Qe6 Kh8 110.Qxg6 Rf4+ 111.Kg3 Rf3+ 112.Kh4

User avatar
MikeB
Posts: 4043
Joined: Thu Mar 09, 2006 5:34 am
Location: Pen Argyl, Pennsylvania

Re: A wrong mate score by stockfish because 50 move rule

Post by MikeB » Sat Oct 26, 2019 6:06 am

Uri Blass wrote:
Fri Oct 25, 2019 12:23 am


I analyze the position after 40.Ke7 and get a wrong mate score

FEN: 8/1p2KP2/1p4q1/1Pp5/2P5/N1Pp1k2/3P4/1N6 b - - 76 40

Stockfish_19102310_x64_modern:
<snip>
92/38 02:11 804,505k 6,122k +M19 40. ... Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Ke8 Qe6+ 44.Kf8 Kf4 45.Kg7 Qe7 46.Kg8 Qg5+ 47.Kh7 Qf6 48.Kg8 Qg6+ 49.Kf8 Kf5 50.Ke7 Qe6+ 51.Kd8 Qxf7 52.Kc8 Ke5 53.Kb8 Kd6 54.Nc2 dxc2 55.d4 Qc7+ 56.Ka7 cxb1Q 57.dxc5+ bxc5 58.b6 Qa1+

stockfish miss 51.Kf8 Kg6 52.Nc2 or 52.Kg8 with a draw by the 50 move rule.

The initial position is from a study by N.Elkies and it shows that you cannot trust stockfish to handle the 50 move correctly and that it even can show false mate scores.

Note that I used 3 cores and stockfish is not deterministic with 3 cores so it can show also 0.00 but basically you cannot trust mate scores of stockfish to be correct.

Note that I am not convinced that the study is correct and maybe black can win faster without a draw by the 50 move rule but unfortunately I know no engine that can help to prove that the study is correct and if I cannot trust even mate scores then mate score in some different line also prove nothing.

I did not find a way to progress faster and force a win but not finding a faster way is not a proof because maybe there is something that I missed.
I now have a version that sees it cannot make progress - not sure if I crippled SF or not. Will run some tests overnight


Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 91	+1.11!	3.56G	1:56.21	Qg7! 
 91	+0.79!	3.52G	1:54.91	Qg7! 
 91	+0.55!	3.50G	1:54.37	Qg7! 
 91	+0.37!	3.50G	1:54.24	Qg7! 
 91	+0.23!	3.50G	1:54.19	Qg7! 
 91	+0.14!	3.49G	1:54.14	Qg7! 
 91	+0.07!	3.49G	1:54.08	Qg7! 
 90	  0.00 	3.48G	1:53.82	Qg7 Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Ke5 Ke7 Qe6+ Kf8 
 90	+0.79!	3.48G	1:53.61	Qg7! 
 90	+0.55!	3.42G	1:51.65	Qg7! 
 90	+0.37!	3.40G	1:50.98	Qg7! 
 90	+0.23!	3.19G	1:43.40	Qe4+! 
 90	+0.14!	3.18G	1:43.30	Qe4+! 
 90	+0.07!	3.17G	1:42.99	Qe4+! 
 89	  0.00 	3.10G	1:40.45	Qe4+ Kf6 Qh4+ Kg7 Qg5+ Kh8 Qf6+ Kg8 Qg6+ Kf8 Kf4 Ke7 Qg7 Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Qg6 
 89	+0.23!	2.71G	1:27.08	Qe4+! 
 89	+0.14!	2.71G	1:27.03	Qe4+! 
 89	+0.07!	2.71G	1:27.00	Qe4+! 
 88	  0.00 	2.51G	1:20.75	Qe4+ Kd6 Qf4+ Ke7 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qg4+ Kh8 Qh5+ Kg7 Qg5+ Kh7 Qe7 Kg8 Qg5+ 
 88	+0.14!	2.45G	1:18.91	Qe4+! 
 88	+0.07!	2.43G	1:17.98	Qe4+! 
 87	  0.00 	2.42G	1:17.93	Qe4+ Kd7 Qg4+ Ke7 
 87	+0.14!	2.42G	1:17.86	Qe4+! 
 87	+0.07!	2.41G	1:17.46	Qe4+! 
 86	  0.00 	2.34G	1:14.92	Qe4+ Kd7 Qg4+ Ke8 Qc8+ Ke7 Qc7+ Ke8 
 86	+0.07!	2.18G	1:09.70	Qe4+! 
 85	  0.00 	1.96G	1:02.32	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kh8 Qf6+ Kg8 
 84	  0.00 	1.92G	1:01.23	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 84	+0.14!	1.92G	1:01.12	Qg5+! 
 84	+0.07!	1.92G	1:01.09	Qg5+! 
 83	  0.00 	1.92G	1:01.09	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kf8 Kf4 Ke8 Qe5+ Kd8 Qd6+ Ke8 
 83	+0.37!	1.88G	1:00.03	Qg5+! 
 83	+0.23!	1.88G	0:59.99	Qg5+! 
 83	+0.14!	1.88G	0:59.96	Qg5+! 
 83	+0.07!	1.88G	0:59.95	Qg5+! 
 82	  0.00 	1.87G	0:59.58	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kh8 Qh6+ Kg8 
 82	+0.23!	1.87G	0:59.49	Qg5+! 
 82	+0.14!	1.86G	0:59.24	Qg5+! 
 82	+0.07!	1.85G	0:58.96	Qg5+! 
 81	  0.00 	1.81G	0:57.85	Qg5+ Kd7 Qf5+ Ke7 Qe5+ Kd7 Qb8 Ke7 Qc7+ Ke8 Qc8+ Ke7 
 81	+1.52!	1.76G	0:56.03	Qg5+! 
 81	+1.11!	1.76G	0:55.98	Qg5+! 
 81	+0.79!	1.73G	0:55.25	Qg5+! 
 81	+0.55!	1.73G	0:55.23	Qg5+! 
 81	+0.37!	1.73G	0:55.20	Qg5+! 
 81	+0.23!	1.73G	0:55.17	Qg5+! 
 81	+0.14!	1.73G	0:55.16	Qg5+! 
 81	+0.07!	1.73G	0:55.09	Qe4+! 
 80	  0.00 	846.8M	0:27.89	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 80	+0.07!	809.7M	0:26.69	Qg5+! 
 79	  0.00 	809.7M	0:26.69	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 79	+0.14!	806.8M	0:26.60	Qg5+! 
 79	+0.07!	805.4M	0:26.55	Qg5+! 
 78	  0.00 	805.1M	0:26.54	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 
 78	+0.07!	803.7M	0:26.50	Qg5+! 
 77	  0.00 	803.3M	0:26.49	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 
 77	+0.07!	802.5M	0:26.46	Qg5+! 
 76	  0.00 	801.9M	0:26.44	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kh7 Qf6 Kg8 
 76	+0.07!	801.8M	0:26.44	Qg5+! 
 75	  0.00 	801.7M	0:26.44	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kh7 Qf6 Kg8 
 75	+0.07!	801.0M	0:26.42	Qg5+! 
 74	  0.00 	801.0M	0:26.42	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Ke5 Ke7 Qd6+ Ke8 Ke6 Nc2 
 74	+0.55!	794.3M	0:26.21	Qg5+! 
 74	+0.37!	777.7M	0:25.69	Qg5+! 
 74	+0.23!	774.0M	0:25.57	Qg5+! 
 74	+0.14!	772.0M	0:25.50	Qg5+! 
 74	+0.07!	754.3M	0:24.95	Qg5+! 
 73	  0.00 	754.2M	0:24.95	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 73	+0.07!	259.2M	0:09.14	Qg5+! 
 72	  0.00 	259.0M	0:09.13	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 72	+0.23!	253.2M	0:08.93	Qg5+! 
 72	+0.14!	247.5M	0:08.72	Qg5+! 
 72	+0.07!	243.8M	0:08.59	Qg5+! 
 71	  0.00 	243.1M	0:08.56	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 71	+0.23!	234.5M	0:08.26	Qg5+! 
 71	+0.14!	234.0M	0:08.25	Qg5+! 
 71	+0.07!	221.4M	0:07.78	Qg5+! 
 70	  0.00 	219.4M	0:07.71	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Ke4 Kg7 Qe5+ Kg8 Qg5+ Kh8 Qf6+ Kg8 
 70	+0.07!	212.9M	0:07.47	Qg5+! 
 69	  0.00 	211.2M	0:07.40	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Ke4 Kg7 Qe5+ Kg8 Qg5+ Kh8 Qf6+ Kg8 
 69	+0.07!	197.7M	0:06.88	Qg5+! 
 68	  0.00 	196.4M	0:06.84	Qg5+ Ke8 Qe5+ Kd8 Qd6+ Ke8 Qe6+ Kf8 Ke4 Kg7 Qe5+ Kg8 Qg5+ Kh8 Qf6+ Kg8 
 68	+0.79!	192.3M	0:06.68	Qg5+! 
 68	+0.55!	187.6M	0:06.50	Qg5+! 
 68	+0.37!	186.7M	0:06.47	Qg5+! 
 68	+0.23!	186.4M	0:06.46	Qg5+! 
 68	+0.14!	183.8M	0:06.36	Qg5+! 
 68	+0.07!	182.1M	0:06.29	Qg5+! 
 67	  0.00 	179.1M	0:06.17	Qg5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Ke4 Kg7 Qe5+ Kg8 Qg5+ Kh8 Qf6+ Kg8 Qg6+ Kf8 Qg5 Ke8 Qe5+ Kd7 Qf6 Ke8 
 67	+0.55!	174.2M	0:05.98	Qg5+! 
 67	+0.37!	172.1M	0:05.90	Qg5+! 
 67	+0.23!	171.0M	0:05.86	Qg5+! 
 67	+0.14!	170.4M	0:05.83	Qg5+! 
 67	+0.07!	170.1M	0:05.82	Qg5+! 
 66	  0.00 	163.8M	0:05.59	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 66	+0.07!	157.2M	0:05.35	Qg5+! 
 65	  0.00 	156.3M	0:05.31	Qg5+ Ke8 Qe5+ Kd8 Qd6+ Ke8 Qe6+ Kf8 Kg4 Kg7 Qe7 Kg8 Qg5+ Kf8 Qf6 Kg8 
 65	+0.37!	152.7M	0:05.18	Qg5+! 
 65	+0.23!	151.9M	0:05.15	Qg5+! 
 65	+0.14!	151.2M	0:05.13	Qg5+! 
 65	+0.07!	148.0M	0:05.02	Qe4+! 
 64	  0.00 	106.0M	0:03.60	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 
 64	+0.14!	100.5M	0:03.42	Qg7! 
 64	+0.07!	99.2M  	0:03.38	Qg7! 
 63	  0.00 	98.3M  	0:03.35	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 
 63	+0.14!	98.2M  	0:03.35	Qg7! 
 63	+0.07!	96.6M  	0:03.30	Qg5+! 
 62	  0.00 	95.3M  	0:03.25	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 
 62	+0.14!	94.4M  	0:03.23	Qg5+! 
 62	+0.07!	93.1M  	0:03.19	Qg5+! 
 61	  0.00 	91.0M  	0:03.11	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kh8 Qh5+ Kg8 Qg6+ Kf8 Kf4 Ke8 Qe6+ Kf8 Qg6 
 60	  0.00 	80.7M  	0:02.75	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Kf4 Kg7 Qd7 Kf6 Qf5+ Kg7 Qg5+ Kh8 Qf6+ Kg8 Qg6+ Kf8 
 59	  0.00 	79.9M  	0:02.73	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Kf4 Kg7 Qd7 Kf6 Qf5+ Ke7 Qe5+ Kf8 Kg4 Kg8 Qg5+ Kh7 Qf6 Kg8 
 58	  0.00 	79.7M  	0:02.72	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh8 Qf6+ Kg8 
 57	  0.00 	79.6M  	0:02.72	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 
 56	  0.00 	78.8M  	0:02.69	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kg4 Kg7 Qd7 Kf6 Qf5+ Kg7 Qg5+ Kh8 Qf6+ Kg8 Qg6+ Kf8 Qe6 
 55	  0.00 	77.5M  	0:02.65	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 54	  0.00 	76.5M  	0:02.62	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 53	  0.00 	76.1M  	0:02.60	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 
 52	  0.00 	51.0M  	0:01.78	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 51	  0.00 	48.9M  	0:01.71	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 
 50	  0.00 	45.3M  	0:01.59	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Kg4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 
 49	  0.00 	40.9M  	0:01.45	Qg5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kh8 Qf6+ Kg8 Qg6+ Kf8 Qh7 Ke7 Qh4+ Ke8 Qh5 Ke7 
 48	  0.00 	39.2M  	0:01.39	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 
 47	  0.00 	36.5M  	0:01.30	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kf8 
 46	  0.00 	35.6M  	0:01.27	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kh7 Qf6 Kg8 
 45	  0.00 	34.0M  	0:01.21	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Kg4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 
 44	  0.00 	33.2M  	0:01.18	Qg5+ Ke8 Qg6 Ke7 
 43	  0.00 	26.1M  	0:00.92	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Kf5 Ke7 Qe6+ Kf8 
 42	  0.00 	25.0M  	0:00.88	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh8 Qh6+ Kg8 Qg6+ Kf8 
 41	  0.00 	24.8M  	0:00.87	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 
 40	  0.00 	24.7M  	0:00.87	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 
 39	  0.00 	24.6M  	0:00.86	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 
 38	  0.00 	24.1M  	0:00.85	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh8 Qh6+ Kg8 
 37	  0.00 	23.7M  	0:00.83	Qg5+ Ke8 Qe5+ Kd8 Qd6+ Ke8 Qe6+ Kf8 Kg4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 
 36	  0.00 	22.9M  	0:00.80	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 
 35	  0.00 	22.7M  	0:00.79	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 
 34	  0.00 	22.5M  	0:00.79	Qe4+ Kd8 Qf4 Ke7 Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 33	  0.00 	22.4M  	0:00.78	Qe4+ Kd7 Qf4 Ke7 
 32	  0.00 	22.3M  	0:00.78	Qe4+ Kd8 Qh4+ Ke8 Qh5 Ke7 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qd7 Kf6 Qd8+ Kg7 
 31	  0.00 	22.1M  	0:00.77	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Qf6 
 30	  0.00 	22.0M  	0:00.76	Qg5+ Ke8 Qe5+ Kd8 Qd6+ Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Qd6+ 
 29	+6.42 	15.1M  	0:00.54	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke2 b6 Qd7 Nb5 Qc6 Nc7 Kd1 Nb5 Kc2 N5a3+ Kc1 Kb8 Qxb6 Kc8 Qc6+ Kb8 Qd7 Ka7 Qc7 Nb5 Qa5+ Kxb7 Kxb1 Kc6 Kc1 Nd6 Kxd2 
 28	+6.42 	14.9M  	0:00.53	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke2 Kb6 Kd1 Ka7 Qc7 b6 Qd7 Ka8 Qc8+ Ka7 Kc1 Nb5 Qd7 N5a3 Qc6 Kb8 Qxb6 Kc8 Qc6+ Kd8 Qd6+ Kc8 Qe7 Kb8 Qd7 Ka7 Qc7 
 27	+6.20 	14.1M  	0:00.50	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kg4 Kg7 Qe7 Kg8 Qg5+ Kf8 Kf4 Ke8 Qh5 Ke7 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Kf3 b6 Ke2 Ka8 Qe4 Ka7 Qc6 Nb5 Kd1 
 26	+3.32 	13.1M  	0:00.46	Qe4+ Kd7 Qf5+ Ke7 Qe5+ Kd7 Qh8 Kc7 Qf6 Kxb7 Ke4 Ka7 Ke5 Ka6 Qd8 f8=Q Qxf8 Kxb6 Qc8 Ka7 Qc7+ Ka6 Qb8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 N5a3 Qa2 
 25	+5.99 	4.88M  	0:00.17	Qg5+ Kf8 Qg6 Ke7 Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Qc7 b6 Qc6 Nb5 Ke2 N5a3 Kd1 Kb8 Qxb6 Kc8 Qc6+ Kd8 Qd6+ Kc8 Qe7 Kb8 Qd7 Ka7 Kc1 Kb6 Qc6+ Ka7 Qc7 Nb5 Qa5+ Kxb7 Kxb1 
 24	+5.92 	4.64M  	0:00.16	Qg5+ Kf8 Qg6 Ke7 Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Qc7 b6 Qc6 Kb8 Ke2 Ka7 Kd1 Kb8 Qxb6 Kc8 Qc6+ Kd8 Qd6+ Ke8 Qe6+ Kd8 Kc1 Kc7 Qc6+ Kd8 Qd6+ Kc8 Qe7 Kb8 Qd7 Ka7 Qc7 Nb5 Qa5+ Kxb7 Kxb1 Nd6 Qa2 
 23	+5.82 	4.31M  	0:00.15	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Qc7 b6 Qc6 Nb5 Ke2 N5a3 Kd1 Kb8 Qxb6 Kc8 Qc6+ Kd8 Qd6+ Ke8 Qe6+ Kd8 Kc1 Kc7 Qc6+ Kd8 Qd6+ Kc8 Qe7 Kb8 Qd7 Ka7 Qc7 Nb5 Qa5+ Kxb7 Kxb1 Kc6 Kc1 Kd5 
 22	+5.81 	4.24M  	0:00.15	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Qc7 b6 Qc6 Kb8 Ke2 Ka7 Kd1 Kb8 Qxb6 Kc8 Qc6+ Kd8 Qd6+ Ke8 Qe6+ Kd8 Kc1 Kc7 Qc6+ Kd8 Qd6+ Kc8 Qe7 Kb8 Qd7 Ka7 
 21	+5.24 	2.49M  	0:00.09	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Qc7 b6 Qc6 Nb5 Ke2 Nc7 Qh1 Nb5 Qxb1 Kxb7 Kxd2 Kc6 Ke3 b7 d2 b8=Q d1=Q Kxc5 Qh5+ Kb6 Qbg6+ Nd6 
 20	+5.19 	2.06M  	0:00.07	Qg7 Ke8 Qe5+ Kd7 Qf5+ Ke7 Qg5+ Kf8 Kf4 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Kf3 b6 Ke2 Nb5 Qe4 Nd6 Qh1 Nxb7 Qxb1 Nxc5 Qa2+ Na6 Qxd2 b7 
 19	+5.08 	1.85M  	0:00.06	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Qc7 b6 Qc6 Nb5 Ke2 Nc7 Qh1 Nd5 Qxb1 Kxb7 Kxd2 Kc7 Kc1 b7 
 18	+4.11 	1.07M  	0:00.04	Qg5+ Ke8 Qh5 Kf8 Qe5 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Kf4 Ke7 Qg7 Ke8 Qe5+ Kd8 Qf6+ Kc7 Qxf7+ Kxb6 Qe7 Ka7 Kf3 b6 Qe4 
 17	+3.56 	900269	0:00.03	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qg4+ Kf8 Qg5 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Kf3 b6 Ke2 
 16	+4.38 	734292	0:00.03	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka5 Qe6 Ka4 Ke2 Kb3 Qg4 b6 Qg6 Ka4 Qxb6 Nb5 Kd1 Ka3 Kc1 
 15	+3.73 	668362	0:00.02	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Qc7 b6 Qc6 Nb5 Ke2 N5a3 Kd1 
 14	+3.48 	577768	0:00.02	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka5 Kf4 Ka4 Qe6 Ka5 Kf5 b6 Kf4 Kb5 Qe5 Ka5 Qe7 
 13	+3.60 	524444	0:00.02	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke2 Kb6 Kd1 Ka5 Qc7+ b6 Qc6 Nb5 
 12	+3.98 	344500	0:00.01	Qg5+ Kf8 Kf4 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kf8 Kf5 Ke8 Qg6 Ke7 Qg7 Kd7 Qxf7+ Kd6 Qf6+ Kc7 
 11	  0.00 	326580	0:00.01	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 10	+1.46 	244752	0:00.01	Qe4+ Kf6 Qf4+ Kg7 Qe5+ Kg8 Qg5+ Kh8 Qf6+ Kg8 Qg6+ Kf8 Qg3 Ke7 Qg5+ Ke8 Qe5+ Kd7 
  9	+1.65 	118260	0:00.00	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Ke4 Kg7 Qe5+ Kf8 Kf4 
  8	+1.60 	92800  	0:00.00	Qe4+ Kf6 Qh4+ Kg7 Qe7 Kg8 Qg5+ Kh8 Qf6+ Kg8 Qg6+ Kf8 
  7	+1.23 	66244  	0:00.00	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qh6+ Kg8 
  6	+1.57 	33068  	0:00.00	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
  5	+1.24 	17577  	0:00.00	Qg7 Ke8 Qe5+ Kd7 Qf4 Ke7 
  4	+1.24 	10802  	0:00.00	Qg7 Ke8 Qe5+ Kf8 Qf4 Ke7 
  3	+1.24 	7365    	0:00.00	Qe4+ Kd6 Qf5 Ke7 Qe4+ Kd6 
  2	+1.24 	4206    	0:00.00	Qe4+ Kd6 Qf4+ Ke7 
  1	+1.16 	1584    	0:00.00	Qg5+ Ke6 
  1	Found 1511 tablebases 
Below is a link to a test run with the fix
1st one is 500 games at 10 sec with .333 second. Takes less than hour, 2nd run is 2 min with 4 sec increment, will run for 11 hours . Good night!
PS A lot of times, fixes like this cost elo.

https://www.dropbox.com/s/gcongeceqygmt ... a.txt?dl=0
Image

User avatar
MikeB
Posts: 4043
Joined: Thu Mar 09, 2006 5:34 am
Location: Pen Argyl, Pennsylvania

Re: A wrong mate score by stockfish because 50 move rule

Post by MikeB » Mon Oct 28, 2019 1:57 am

Stockfish lost a game earlier this year against Lc0 because of this bug.

https://www.tcec-chess.com/archive.html ... =fl&game=9





Interestingly - cur dev Honey would have gladly ended the game right here - can you find the move? (scroll down to see it)

































Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 70	  0.00 	1.63G	11:51.58	Qxb4+ Kxb4 
 69	  0.00 	1.63G	11:49.55	Qxb4+ Kxb4 
 68	  0.00 	1.36G	9:59.30	Qxb4+ Kxb4 
 67	  0.00 	1.36G	9:59.30	Qxb4+ Kxb4 
 66	  0.00 	1.36G	9:59.29	Qxb4+ Kxb4 
 65	  0.00 	1.33G	9:43.61	Qxb4+ Kxb4 
 64	  0.00 	727.8M	5:27.32	Qxb4+ Kxb4 
 63	  0.00 	725.6M	5:26.42	Qxb4+ Kxb4 
 62	  0.00 	512.2M	3:49.75	Qxb4+ Kxb4 
 61	  0.00 	249.9M	1:52.29	Qxb4+ Kxb4 
 60	  0.00 	128.2M	0:55.48	Qxb4+ Kxb4 
 59	  0.00 	128.2M	0:55.48	Qxb4+ Kxb4 
 58	  0.00 	124.5M	0:53.94	Qxb4+ Kxb4 
 57	  0.00 	124.5M	0:53.94	Qxb4+ Kxb4 
 56	  0.00 	50.8M  	0:22.44	Qxb4+ Kxb4 
 55	  0.00 	50.8M  	0:22.44	Qxb4+ Kxb4 
 54	  0.00 	33.5M  	0:14.60	Qxb4+ Kxb4 
 53	  0.00 	17.1M  	0:07.47	Qxb4+ Kxb4 
 52	  0.00 	16.5M  	0:07.23	Qxb4+ Kxb4 
 51	  0.00 	16.2M  	0:07.10	Qxb4+ Kxb4 
 50	  0.00 	4.08M  	0:01.79	Qxb4+ Kxb4 
 49	  0.00 	3.22M  	0:01.39	Qxb4+ Kxb4 
 48	  0.00 	3.05M  	0:01.32	Qxb4+ Kxb4 
 47	  0.00 	2.75M  	0:01.20	Qxb4+ Kxb4 
 46	  0.00 	2.74M  	0:01.19	Qxb4+ Kxb4 
 45	  0.00 	2.74M  	0:01.19	Qxb4+ Kxb4 
 44	  0.00 	2.73M  	0:01.19	Qxb4+ Kxb4 
 43	  0.00 	2.73M  	0:01.19	Qxb4+ Kxb4 
 42	  0.00 	2.73M  	0:01.19	Qxb4+ Kxb4 
 41	  0.00 	998347	0:00.41	Qxb4+ Kxb4 
 40	  0.00 	995679	0:00.41	Qxb4+ Kxb4 
 39	  0.00 	993775	0:00.40	Qxb4+ Kxb4 
 38	  0.00 	57597  	0:00.02	Qxb4+ Kxb4 
 37	  0.00 	55128  	0:00.02	Qxb4+ Kxb4 
 36	  0.00 	53113  	0:00.02	Qxb4+ Kxb4 
 35	  0.00 	50418  	0:00.02	Qxb4+ Kxb4 
 34	  0.00 	48754  	0:00.02	Qxb4+ Kxb4 
 33	  0.00 	46365  	0:00.02	Qxb4+ Kxb4 
 32	  0.00 	44368  	0:00.02	Qxb4+ Kxb4 
 31	  0.00 	42611  	0:00.02	Qxb4+ Kxb4 
 30	  0.00 	40758  	0:00.02	Qxb4+ Kxb4 
 29	  0.00 	38693  	0:00.02	Qxb4+ Kxb4 
 28	  0.00 	35213  	0:00.01	Qxb4+ Kxb4 
 27	  0.00 	32263  	0:00.01	Qxb4+ Kxb4 
 26	  0.00 	29533  	0:00.01	Qxb4+ Kxb4 
 25	  0.00 	26716  	0:00.01	Qxb4+ Kxb4 
 24	  0.00 	25227  	0:00.01	Qxb4+ Kxb4 
 23	  0.00 	24742  	0:00.01	Qxb4+ Kxb4 
 22	  0.00 	24095  	0:00.01	Qxb4+ Kxb4 
 21	  0.00 	23663  	0:00.01	Qxb4+ Kxb4 
 20	  0.00 	23157  	0:00.01	Qxb4+ Kxb4 
 19	  0.00 	21694  	0:00.01	Qxb4+ Kxb4 
 18	  0.00 	20445  	0:00.01	Qxb4+ Kxb4 
 17	  0.00 	19326  	0:00.01	Qxb4+ Kxb4 
 16	  0.00 	18928  	0:00.01	Qxb4+ Kxb4 
 15	  0.00 	17762  	0:00.01	Qxb4+ Kxb4 
 14	  0.00 	16995  	0:00.01	Qxb4+ Kxb4 
 13	  0.00 	16756  	0:00.01	Qxb4+ Kxb4 
 12	  0.00 	16173  	0:00.01	Qxb4+ Kxb4 
 11	  0.00 	15622  	0:00.01	Qxb4+ Kxb4 
 10	  0.00 	14767  	0:00.01	Qxb4+ Kxb4 
  9	  0.00 	14644  	0:00.01	Qxb4+ Kxb4 
  8	  0.00 	14448  	0:00.01	Qxb4+ Kxb4 
  7	  0.00 	14267  	0:00.01	Qxb4+ Kxb4 
  6	  0.00 	13884  	0:00.01	Qxb4+ Kxb4 
  5	  0.00 	13451  	0:00.01	Qxb4+ Kxb4 
  4	  0.00 	13302  	0:00.01	Qxb4+ Kxb4 
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MikeB
Posts: 4043
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Location: Pen Argyl, Pennsylvania

Re: A wrong mate score by stockfish because 50 move rule

Post by MikeB » Mon Oct 28, 2019 2:29 am

MikeB wrote:
Mon Oct 28, 2019 1:57 am
Stockfish lost a game earlier this year against Lc0 because of this bug.

https://www.tcec-chess.com/archive.html ... =fl&game=9



<snip>
This was the position where Stockfish failed. It played Qf6, thinking it would draw because the move in the Transposition table had a different 50 move Rule count that what we have here (66) below

here Qf6 loses

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 33	+100.00 	110.6M	0:25.53	Qe5 
 32	+100.00 	94.6M  	0:21.89	Qe5 
 31	+100.00 	80.8M  	0:18.81	Qe5 Qh6 
 30	+100.00 	62.1M  	0:14.63	Qe5 
 29	+100.00 	55.7M  	0:13.14	Qe5 
 28	+100.00 	33.7M  	0:07.97	Qe5 
 27	+100.00 	24.6M  	0:05.85	Qe5 
 26	+100.00 	14.1M  	0:03.39	Qe5 Qh6 
 25	+100.00 	13.8M  	0:03.31	Qe5 Qh6 Ke8 Qh8+ Kf7 Qh6 Nf5 Qh7+ Kf8 Qc7 Nd6+ Ka8 Nc4 Kb8 Qxc7+ Kxc7 Ke7 c5 b5 Kb8 Kd6 Kb7 Kxc5 Ka7 Kc6 Kb8 Ne5 Ka7 
 24	+100.00 	9.90M  	0:02.37	Qe5 Qh6 Ke8 Qg6+ Kd8 Qd3+ Ke7 Qh7 Qd4 Kc7 Qa7+ Kc8 Qa6+ Kc7 Kf7 Kd7 Qb7+ Kd8 Qxc6 Qh5+ Qg6 Qd5+ Ne6+ Kd7 Qg4 Kc6 Qf4 Qh5+ Kg7 Kd5 Nc7+ Kc6 Na6 Kb6 Qd6+ Kb5 Qe6 Qg5+ Kf7 Qf4+ Ke7 Qd4 Ke8 
 23	+100.00 	7.83M  	0:01.90	Qe5 Qh6 Ke8 Qg6+ Kd8 Qd3+ Ke7 Qh7 Qd4 Kc7 Qa7+ Kc8 Qa6+ Kc7 Kf7 Kd7 Qb7+ Kd8 Qxc6 Qh5+ Qg6 Qxg6+ Kxg6 Kd7 Nf5 Kc6 Nd4+ Kd5 b5 Kc5 Kf6 Kb6 Ke6 Kc5 Ke7 Kb6 Kd6 
 22	+100.00 	5.57M  	0:01.36	Qe5 Qh6 Ke8 Qg6+ Kd8 Qd3+ Ke7 Qh7 Qd4 Kc7 Kf7 Kb7 Qc5 Qd3 Nf5 Qd7+ Ne7 Qc7 Qd4 Qb6 Qd7+ Qc7 Ke6 Qxd7+ Kxd7 Kb6 Nxc6 Kb5 Kc7 Kc4 Kb6 
 21	+100.00 	4.35M  	0:01.07	Qe5 Qh6 Kf7 Qh4 Qc5 Qh7 Qd4 Ka6 Qe5 Kb6 Qa5+ Kb7 Qc5 Qh1 Qd4 Kc8 Ke6 Qh6+ Ke7 Qg5+ Kd6 Kb7 Kd7 Qb5 Ke7 Qg5+ Ke8 Qd5 Qxd5 cxd5 Ne6 Kc6 Nd4+ Kd6 Kf7 Ke5 
 20	+100.00 	3.10M  	0:00.77	Qe5 Qg4 Qc5 Qc8+ Kf7 Qd7+ Kg6 Qg4+ Kf6 Qh4+ Kf7 Qh7 Qd4 Ka6 Qe5 Kb6 Qa5+ Kb7 Qc5 Qh1 Qd4 Kc8 Kg6 Kc7 Nf5 Qg2+ Kf6 Qf1 Qc5 Kb7 Kf7 Qg2 b5 cxb5 Nd6+ Ka8 Qc8+ Ka7 
 19	+100.00 	1.70M  	0:00.44	Qe5 Qg4 Qc5 Qc8+ Kf7 Qd7+ Kg6 Qg4+ Kf6 Qh4+ Kf7 Qh7 Qd4 Kc8 Ke7 Qh3 Qd6 Qh4+ Ke8 Qh8+ Kf7 Qh1 Qc5 Kb7 Kg6 Qf3 Nf5 Qg4+ Kh6 Qg2 b5 cxb5 Nd6+ Ka8 
 18	+100.00 	1.50M  	0:00.39	Qe5 Qg4 Qc5 Qc8+ Kf7 Qc7+ Kg6 Qg3+ Kf6 Qh4+ Kf7 Qh7 Qd4 Kc8 Ke7 Qh3 Qd6 Qh4+ Ke8 Qh8+ Kf7 Qh1 Qf8+ Kb7 Nf5 Kb6 Qc5+ Kb7 b5 cxb5 Nd6+ Ka8 Nxb5 Qb7+ Kf6 
 17	+100.00 	1.25M  	0:00.33	Qe5 Qg4 Qc5 Qc8+ Kf7 Qc7+ Kg6 Qg3+ Kf6 Qh4+ Kf7 Qh7 Qd4 Kc8 Ke7 Qh3 Qc5 Qd7+ Kf6 Qd8+ Kg6 Kb7 Nf5 Qe8+ Kg5 Qd8+ Qe7+ Qxe7+ Nxe7 Kc7 
 16	+100.00 	1.03M  	0:00.27	Qe5 Qg4 Qc5 Qc8+ Kf7 Qc7+ Kg6 Qg3+ Kf6 Qh4+ Kf7 Qh7 Qd4 Kc8 Ke6 Qh6+ Ke7 Qh3 Qd6 Qh4+ Ke8 Qe4+ Qe6+ Qxe6+ Nxe6 Kb7 Nf4 Kb6 Nd3 Kb7 Ke7 Kc7 
 15	+100.00 	703031	0:00.19	Qe5 Qg4 Qe7+ Kc8 Qc5 Qf4+ Ke7 Qc7+ Kf6 Qd8+ Kg6 Kb7 Nf5 Qb6 Nd4 Qxc5 bxc5 Kc7 Kf5 Kd7 
 14	+100.00 	452343	0:00.13	Qe5 Qh6 Qd4 Kc8 Ke7 Qh3 Ne6 Qh7+ Kd6 Qd7+ Ke5 Qe8 Qd6 Qh8+ Ke4 Qh4+ Kd3 Qh7+ Kd2 Qd7 Qxd7+ Kxd7 Nc5+ Ke7 
 13	+100.00 	317674	0:00.09	Qe5 Qh6 Kf7 Qh4 Qc5 Qh7 Qd4 Qh8 Qe4 Qc8 Ne6 Qd7+ Kf8 Qd6+ Ke8 Kc8 Nf8 Qd5 Qxd5 cxd5 Ne6 
 12	+100.00 	241738	0:00.07	Qe5 Qh6 Kf7 Qh4 Qc5 Qh7 Qd6 Qh4 Nf5 Qh7+ Kf6 Qh8+ Kg5 Qc8 Kf4 Qc7 Qxc7+ Kxc7 Ke5 
 11	+100.00 	141758	0:00.05	Qe5 Qh7 Nf5 Qc7 Nd6+ Ka8 Nc4 Qxe5 Nxe5 Ka7 Ke7 Kb6 
 10	+100.00 	116676	0:00.04	Qe5 Qh7 Nf5 Qd7 Nd6+ Kb8 Nc4+ Ka7 Qe3+ Kb8 Qb6+ Kc8 Ne5 Qb7 Qxc6+ Qxc6 Nxc6 
  9	+100.00 	63346  	0:00.03	Qe5 Qh7 Kf7 Qh6 Qd4 Qh8 Ne6 Qxd4 Nxd4 Kc7 
  8	+100.00 	22790  	0:00.02	Qe5 Qh7 Qd4 Kc8 Ke7 Qh8 Ne6 Qxd4 Nxd4 Kb7 
  7	+100.00 	20343  	0:00.02	Qe5 Qh7 Qd4 Kc8 Ke7 Qh8 Ne6 Qxd4 Nxd4 Kb7 
  6	+100.00 	11411  	0:00.01	Qe5 Qb1 Qe7+ Kb6 Ne8 Kb5 
  5	+100.00 	11115  	0:00.01	Qe5 Qb1 Qe7+ Kb6 Ne6 Qd3 Ke8 Kb5 Qc5+ Ka4 Qxc6+ Kxb4 Qc5+ Kb3 
  4	+100.00 	467      	0:00.01	Qe5 Qb1 Ne6 Qxb4+ Ke8 Kb6 
  3	+100.00 	338      	0:00.01	Qe5 Qb1 Ne6 Qxb4+ Ke8 Kb6 
  2	+100.00 	147      	0:00.01	Qe5 Qb1 Ne6 Qxb4+ Kf7 
  1	+100.00 	1          	0:00.01	Qe5 
  0	# 

Here , with the movecounter at 71 below , Qf6 still draws - so the transposition table (TT) had this move as a draw when the move count was at 71 ( or higher), but the position came up where 50 move rule move counter was at 66 , so it plays the losing move thinking it still had a draw. The 50 Rule move counter is not stored in the TT. It look this will be fixed in the near future by the SF team.


Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 43	+0.33 	1.46G	7:07.52	Qe5 Qh6 Ke8 Qh8+ Kf7 Qh4 Qc5 Qh7 Qd4 Ka6 Qe5 Kb6 Qa5+ Kb7 Qc5 Qh4 b5 cxb5 Qxb5+ Ka7 Nf5 Qh7+ Kf6 Qb7 Qe5 Qb4 Qd5 Kb6 Nd4 Qc5 Qe6+ Kc7 Qe4 Kb6 Qb1+ Ka6 Qa2+ Kb6 Qb2+ Ka6 Ne6 Qc4 Qd2 Kb6 Kf5 Qb5+ Kg4 Qc4+ Nf4 Qe4 Kg3 Kb5 Ne2 Qg6+  
 42	+0.33 	1.26G	6:22.72	Qe5 
 41	+0.33 	1.07G	5:29.36	Qe5 
 40	+0.33 	473.6M	2:30.12	Qe5 
 39	+0.33 	449.5M	2:22.31	Qe5 
 38	+0.33 	438.0M	2:18.97	Qe5 
 37	+0.33 	432.9M	2:17.51	Qe5 
 36	+0.33 	326.9M	1:44.86	Qe5 
 35	+0.33 	176.5M	0:56.87	Qe5 
 34	+0.33 	70.8M  	0:22.66	Qe5 Qh6 
 33	+0.33 	65.7M  	0:21.10	Qe5 
 32	+0.33 	62.0M  	0:19.90	Qe5 
 31	+0.33 	39.9M  	0:12.70	Qe5 
 30	+0.33 	35.6M  	0:11.41	Qe5 Qh6 
 29	+0.33 	30.7M  	0:09.84	Qe5 
 28	+0.33 	29.4M  	0:09.41	Qe5 
 27	+0.33 	26.6M  	0:08.57	Qe5 
 26	+0.33 	22.6M  	0:07.32	Qe5 
 25	+0.33 	17.8M  	0:05.90	Qe5 
 24	+0.33 	15.4M  	0:05.17	Qe5 
 23	+0.33 	14.6M  	0:04.95	Qe5 
 22	+0.33 	14.4M  	0:04.87	Qe5 
 21	+0.33 	9.88M  	0:03.45	Qe5 Qh6 
 20	+0.33 	1.30M  	0:00.43	Qe5 Qh6 Qe7+ Ka6 Qc5 Qf6+ Kg8 Qg6 Qe5 Kb7 Qa5 Kb8 Qb6+ Kc8 Qa6+ Kb8 Qa5 Qf6 Qc5 Kc8 b5 Kb7 Nf5 Qd8+ Kh7 cxb5 Nd6+ Kb8 Qxb5+ Kc7 Ne8+ Kc8 Qc6+ Kb8 
 19	+0.33 	1.09M  	0:00.36	Qe5 Qh6 Kf7 Qd2 Qc5 Qd7+ Kg6 Qg4+ Kf6 Qh4+ Kf7 Qh7 Qe7+ Ka6 Qe5 Kb7 Qc5 Qh4 Kf8 Qf6+ Kg8 Kc8 b5 Kb7 Nf5 Qd8+ Kf7 Qd7+ Kf6 cxb5 Nd6+ Ka6 Qa3+ Kb6 
 18	+0.33 	816475	0:00.27	Qe5 Qh6 Qe7+ Ka6 Qc5 Qf6+ Kg8 Qg6 Qe5 Qg4 Qa5+ Kb7 Qc5 Qg3 Kh7 Qh3+ Kg6 Qg3+ Kf6 Qh4+ Kf7 Qh7 Qe5 Qh4 Ne6 Qxb4 Nc5+ Kb6 Nd7+ Ka7 Qc7+ Qb7 
 17	+0.33 	302074	0:00.11	Qe5 Qh6 Kf7 Qh4 Qc5 Qh7 Qe7+ Kc8 Qd6 Kb7 Qc5 Qh3 Nf5 Qh7+ Ke6 Qg6+ Kd7 Qh7+ Ne7 Qh3+ Ke8 Qh8+ Kf7 Qh7+ Kf8 Qe4 b5 cxb5 Qxb5+ Ka8 
 16	+0.33 	247109	0:00.09	Qe5 Qh6 Qc5 Qf6+ Kg8 Kc8 b5 Kb7 Nf5 Qd8+ Kh7 cxb5 Nd6+ Kb8 Qxb5+ Kc7 Ne8+ Kc8 Qc6+ Kb8 Nf6 
 15	+0.33 	219807	0:00.08	Qe5 Qh6 Kf7 Qh4 Qc5 Qh7 Qe7+ Kc8 Qe5 Kd7 Qc5 Qe4 b5 Qf3+ Nf5 cxb5 Qd6+ Kc8 Ke6 Qe2+ Kf6 Qf2 Qc6+ Kb8 
 14	+0.33 	184378	0:00.07	Qe5 Qh6 Kf7 Qh4 Qc5 Qh7 Qe7+ Kc8 Qe5 Kd7 Qd4+ Kc8 Qb6 Qe4 Qc5 Kd7 b5 Qf3+ Nf5 cxb5 Qd6+ Kc8 Ke6 
 13	+0.33 	165808	0:00.06	Qe5 Qh6 Kf7 Qh7 Qc5 Qd3 Nf5 Qd7+ Kg6 Qe6+ Kg5 Qg8+ Kf4 Qf7 Ke5 Qe8+ Qe7+ Qxe7+ Nxe7 Kc7 
 12	+0.33 	96180  	0:00.04	Qe5 Qh6 Qe7+ Ka6 Qc5 Qf6+ Kg8 Kb7 Nf5 Kb8 Nd6 Qg6+ Kf8 Qf6+ Nf7 Kb7 Qe5 Qf2 b5 cxb5 Qxb5+ Kc7 Qc4+ Kb8 
 11	+0.33 	70146  	0:00.03	Qe5 Qh6 Qe7+ Kb6 Qc5+ Kb7 Kg8 Qh4 Nf5 Qe1 Kg7 Qe6 Kf8 Qf6+ Kg8 Kb8 Nd6 Qg6+ Kf8 Qf6+ Nf7 Kb7 Qe5 Qxe5 Nxe5 Kc7 Ke8 
 10	+0.33 	25541  	0:00.02	Qe5 Qh6 Qe7+ Kb6 Qc5+ Kb7 Kg8 Qg6 Qe7+ Ka8 Kf8 Qh6 Kf7 Qf4+ Ke8 Qb8+ Qd8 Qxd8+ Kxd8 Ka7 
  9	+0.33 	6316    	0:00.01	Qe5 Qg4 Qe7+ Kc8 Qe6+ Qxe6 Nxe6 Kd7 Kf7 Kd6 
  8	+0.33 	2199    	0:00.01	Qe5 Qg4 Qe7+ Kc8 Qe6+ Qxe6 Nxe6 Kd7 Kf7 
  7	+0.33 	1415    	0:00.01	Qe5 Qg4 Qe7+ Kb8 Ne6 
  6	+0.33 	553      	0:00.01	Qe5 Qd3 Qe7+ Ka6 Qc5 Kb7 Nf5 
  5	+0.33 	332      	0:00.01	Qe5 Qd3 Qe7+ Ka6 Qc5 Qd8+ Kf7 
  4	+0.33 	185      	0:00.01	Qe5 Qd3 Qe7+ Ka6 b5+ Qxb5 
  3	+0.33 	94        	0:00.01	Qe5 Qh6 Ke8 
  2	+0.33 	41        	0:00.01	Qe5 Qh6 
  1	+0.33 	6          	0:00.01	Qe5 
Image

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