My "engine" is showing a weird pv with this position, in the first depths it's showing somes -M1 -M2 -M3, the position is -M7
[d] r5r1/3q1np1/2b1pb1p/1p1p4/1N1P3P/2P2pB1/1K6/3R1Bk1 b - - 3 8
The pv output is in this image http://i.imgur.com/VZc9Ha7.png
I've tested others engines and also are suffering of this weird pv like Maverick 0.51 x64, here is the pv image http://i.imgur.com/ln1WNOa.png
Also Chesser 1.9 x64 the pv image http://i.imgur.com/JHRqhUK.png
And CPW 1.1, image http://i.imgur.com/aiAHhDA.png
What is wrong? I've tested others mate in X positions and this is the only position where the engine becomes weird
Now I'm debugging in VS to see where is the problem
Some engines shows weird pv in this position
Moderators: hgm, Rebel, chrisw
-
tttony
- Posts: 268
- Joined: Sun Apr 24, 2011 12:33 am
-
pkumar
- Posts: 100
- Joined: Tue Oct 15, 2013 5:45 pm
Re: Some engines shows weird pv in this position
It may be a case of peek-a-boo at horizon.
Output of my engine (under development)
Output of my engine (under development)
Code: Select all
10 -99.86 578991 0:00.65 a8a1 d1a1 g8a8 a1b1 a8a1 b2a1 d7a7 a1b2 a7a2 b4a2 f3f2 11#1[#OK]
9 -99.86 284291 0:00.32 a8a1 d1a1 g8a8 a1b1 a8a1 b2a1 d7a7 a1b2 a7a2 b4a2 f3f2 f1h3 f2f1q b1f1 13$1[#OK]
9 -3.77 133268 0:00.17 a8a1?
8 -2.77 123351 0:00.15 a8a1 d1a1 g8a8 a1d1 a8a1 d1a1 d7a7 a1a7 8#0[#OK]
7 -2.77 96623 0:00.12 a8a1 d1a1 g8a8 a1d1 a8a1 d1a1 d7a7 a1a7 g1f1 b4c6 7$3[#OK]
7 +6.42 66255 0:00.09 a8a1?
6 +8.42 39929 0:00.06 a8a1 d1a1 g8a8 a1d1 a8a1 b2a1 d7a7 a1b2 6$2[#OK]
6 +10.35 16737 0:00.03 a8a1?
5 +12.35 9724 0:00.01 a8a1 d1a1 g8a8 b4a2 a8a2 b2a2 d7a7 a2b2 6$2[#OK]
5 +12.94 6470 0:00.01 a8a1?
4 +13.94 3766 0:00.01 a8a1 b2a1 d7a7 a1b2 a7a4 5$0[#OK]
3 +13.95 2016 0:00.01 a8a1 d1a1 g8a8 a1a8 c6a8 3$2[#OK]
3 +13.48 1503 0:00.01 a8a1!
3 -99.94 1200 0:00.01 a8a2 b4a2 f3f2 f1h3 f2f1q d1f1 5$1[#OK]
3 +11.93 735 0:00.01 a8a2?
2 +14.03 418 0:00.01 a8a2 b4a2 2$0[#OK]
2 +13.48 408 0:00.01 a8a2!
-
Joost Buijs
- Posts: 1563
- Joined: Thu Jul 16, 2009 10:47 am
- Location: Almere, The Netherlands
Re: Some engines shows weird pv in this position
My engine does not show this behavior.
I guess the problem has something to do with the handling of mate values in the quiescence search.
It can also be a problem with the transposition table, very difficult to tell by just looking at the output.
I guess the problem has something to do with the handling of mate values in the quiescence search.
It can also be a problem with the transposition table, very difficult to tell by just looking at the output.
Code: Select all
FEN: r5r1/3q1np1/2b1pb1p/1p1p4/1N1P3P/2P2pB1/1K6/3R1Bk1 b - - 3 8
1 00:00 511 511 +19.76 e6-e5
2 00:00 781 781 +19.61 Ra8-a2+ Kb2xa2 f3-f2
3 00:00 4k 2,223k +19.46 Ra8-a1 Kb2xa1
4 00:00 7k 1,801k +15.17 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-e1 f3-f2
5 00:00 74k 9,233k +14.47 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b1 Qa7-a4 Kb1-c1
6 00:00 94k 9,411k +14.45 Ra8-a1 Kb2xa1 Qd7-a7+ Ka1-b1 Qa7-a4 Kb1-c1 Qa4-a3+ Kc1-c2
7 00:00 114k 9,535k +10.13 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Rd1xa1 Nf7-d6
8 00:00 145k 9,696k +9.76 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a2+ Kb2xa2 Qd7-a7+ Ka2-b1 Qa7-a4 Kb1-c1
9 00:00 160k 8,412k +4.60 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 Kg1xf1 Nb4xc6 Kf1-g2 Ra7xf7 Kg2xg3 Nc6-e5 f3-f2
10 00:00 165k 8,233k +4.60 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 Kg1xf1 Nb4xc6 Kf1-g2 Ra7xf7 Kg2xg3 Nc6-e5 f3-f2
11 00:00 202k 8,076k +4.92 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 Kg1xf1 Nb4xc6 Kf1-g2 Nc6-e7 Kg2xg3 Ne7xg8 f3-f2 Ra7-a1 Bf6xh4
12 00:00 220k 8,164k +4.92 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 Kg1xf1 Nb4xc6 Kf1-g2 Nc6-e7 Kg2xg3 Ne7xg8 f3-f2 Ra7-a1 Bf6xh4
13 00:00 351k 5,847k -1.01 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 Kg1xf1 Ra7xf7 Kf1-g2 Bg3-f2 Bc6-e8 Rf7-f8 Be8-g6
14 00:00 370k 5,515k -1.01 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 Kg1xf1 Ra7xf7 Kf1-g2 Bg3-f2 Bc6-e8 Rf7-f8 Be8-g6
15 00:00 410k 5,322k -1.01 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 Kg1xf1 Ra7xf7 Kf1-g2 Bg3-f2 Bc6-e8 Rf7-f8 Be8-g6
16 00:00 527k 4,581k -M7 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Rd1xa1 Qd7-a7 Ra1-b1 Qa7-a2+ Kb2xa2 Bf6-g5 Bf1-h3+ Bg5-c1 Rb1xc1+-
pkumar
- Posts: 100
- Joined: Tue Oct 15, 2013 5:45 pm
Re: Some engines shows weird pv in this position
Some strong engines show strange PV.
Others don't.
I have chosen these two engines whose source code is available with the hope that some expert will point out the cause.
Code: Select all
FEN: r5r1/3q1np1/2b1pb1p/1p1p4/1N1P3P/2P2pB1/1K6/3R1Bk1 b - - 3 1
Fruit_21:
1/7 00:00 11 0 -M1 Kg1-h1 Bf1-h3+
1/9 00:00 146 0 -M2 f3-f2 Bf1-h3+ f2-f1Q Rd1xf1+
1/12 00:00 269 0 +18.56 e6-e5 Bf1-d3+ Kg1-g2
2/12 00:00 1,267 0 -M1 e6-e5 Bf1-h3+
2/12 00:00 1,565 0 +13.79 Ra8-a2+ Kb2xa2 Rg8-a8+ Ka2-b2
3/19 00:00 3,356 0 -M3 Ra8-a2+ Nb4xa2 f3-f2 Bf1-h3+ f2-f1Q Rd1xf1+
3/19 00:00 4,356 0 +13.34 Ra8-a1 Rd1xa1 Rg8-a8 Ra1xa8 Bc6xa8
4/19 00:00 6,748 0 +13.34 Ra8-a1 Rd1xa1 Rg8-a8 Ra1xa8 Bc6xa8
5/19 00:00 12,696 0 +13.04 Ra8-a1 Rd1xa1 Rg8-a8 Ra1xa8 Bc6xa8 Bf1-d3
6/20 00:00 35,186 0 +8.70 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-b1 Ra8-a2+ Kb2xa2 Qd7-a7+ Ka2-b2
7/22 00:00 89,267 0 +8.30 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-b1 Ra8-a1 Rb1xa1 e6-e5 Bf1-d3+ Kg1-g2
8/22 00:00 202,279 0 -1.88 Ra8-a1 Rd1xa1 Qd7-a7 Ra1-b1 Qa7-a3+ Kb2xa3 Rg8-a8+ Ka3-b3 Ra8-a1 Rb1xa1
9/22 00:00 276,430 0 -5.66 Ra8-a1 Rd1xa1 Qd7-a7 Ra1-b1 Qa7-a3+ Kb2xa3 Rg8-a8+ Ka3-b3 Ra8-a1 Rb1xa1 Nf7-g5 Nb4xc6
10/22 00:00 1,486,262 0 -M7 Ra8-a1 Rd1xa1 Qd7-a7 Ra1-b1 Qa7-a3+ Kb2xa3 Rg8-a8+ Ka3-b3 Ra8-a1 Rb1xa1 f3-f2 Bf1-h3+ f2-f1Q Ra1xf1+
11/22 00:01 3,487,253 2,307,692 -M7 Ra8-a1 Rd1xa1 Qd7-a7 Ra1-b1 Qa7-a3+ Kb2xa3 Rg8-a8+ Ka3-b3 Ra8-a1 Rb1xa1 f3-f2 Bf1-h3+ f2-f1Q Ra1xf1+
12/22 00:02 7,143,033 2,845,168 -M7 Ra8-a1 Rd1xa1 Qd7-a7 Ra1-b1 Qa7-a3+ Kb2xa3 Rg8-a8+ Ka3-b3 Ra8-a1 Rb1xa1 f3-f2 Bf1-h3+ f2-f1Q Ra1xf1+
Code: Select all
Stockfish-231-32-ja:
1/5 00:00 3,007 187,937 +18.18 Ra8-a2+ Kb2xa2
2/6 00:00 5,660 353,750 +17.93 Ra8-a2+ Kb2xa2 Rg8-a8+ Ka2-b2
3/9 00:00 10,500 656,250 +17.41 Ra8-a1 Rd1xa1 Rg8-a8
4/9 00:00 10,867 115,606 +17.77 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-e1
5/9 00:00 13,516 95,858 +15.95 Ra8-a2+ Kb2xa2 Qd7-a7+ Ka2-b2 Qa7-a4 Rd1-a1 Qa4xb4+ c3xb4 Bf6xd4+ Kb2-a2 Bd4xa1 Ka2xa1 Kg1xf1
6/14 00:00 27,423 194,489 +9.73 Ra8-a2+ Kb2xa2 Qd7-a7+ Ka2-b2 Qa7-a4 Rd1-c1 Qa4xb4+ c3xb4 Bf6xd4+ Kb2-b3 Bd4-e3 Rc1xc6 Kg1xf1 Rc6xe6
7/18 00:00 37,223 237,089 +7.51 Ra8-a2+ Kb2xa2 Qd7-a7+ Ka2-b2 Qa7-a4 Rd1-c1 Qa4xb4+ c3xb4 Bf6xd4+ Kb2-b3 Bd4-e3 Rc1-d1 Kg1-h1 Bf1-h3+ Be3-g1 Bh3xe6 Rg8-f8
8/18 00:00 37,368 238,012 +7.51 Ra8-a2+ Kb2xa2 Qd7-a7+ Ka2-b2 Qa7-a4 Rd1-c1 Qa4xb4+ c3xb4 Bf6xd4+ Kb2-b3 Bd4-e3 Rc1-d1 Kg1-h1 Bf1-h3+ Be3-g1 Bh3xe6 Rg8-f8
9/22 00:00 70,789 411,563 +5.25 Ra8-a2+ Kb2xa2 Qd7-a7+ Ka2-b2 Qa7-a4 Rd1-c1 Qa4xb4+ c3xb4 Bf6xd4+ Kb2-b3 Bd4-e3 Rc1-d1 Kg1-h1 Bf1-h3+ Be3-g1 Bh3xe6 Kh1-g2 Be6xf7 Rg8-f8 Bf7-e6 Kg2xg3 Rd1xg1+ Kg3xh4 Rg1xg7
10/25 00:00 76,794 408,478 +7.59 Ra8-a2+ Kb2xa2 Qd7-a7+ Ka2-b2 Qa7-a4 Rd1-c1 Qa4xb4+ c3xb4 Bf6xd4+ Kb2-b3 Bd4-e3 Rc1-d1 Kg1-h1 Bf1-h3+ Be3-g1 Bh3xe6 Kh1-g2 Be6xf7 Rg8-f8 Bf7-e6 Kg2xg3 Rd1xg1+ Kg3-f4 Rg1xg7 f3-f2
11/25 00:00 109,092 534,764 +6.46 Ra8-a2+ Kb2xa2 Qd7-a7+ Ka2-b2 Qa7-a4 Rd1-c1 Qa4xb4+ c3xb4 Bf6xd4+ Kb2-b3 Bd4-e3 Rc1-d1 Kg1-h1 Bf1-h3+ Be3-g1 Bh3xe6 Kh1-g2 Be6xf7 Rg8-f8 Bf7-e6 f3-f2 Bg3xf2 Rf8-f3+ Kb3-c2 Bg1xf2 Be6xd5 Bc6xd5 Rd1xd5 Bf2xh4
12/32 00:00 209,407 837,628 -1.49 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 Kg1xf1 Nb4xc6 Kf1-g2 Bg3-f2 Kg2xf2 Ra7xf7
13/32 00:00 228,873 860,424 -0.56 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 Kg1xf1 Nb4xc6 Kf1-g2 Bg3-e1 Kg2-f1 Ra7xf7 Kf1xe1 Nc6-e5 Bf6xe5 Rf7xf3 Ke1-e2
14/32 00:00 251,950 893,439 -0.48 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Rd1xa1 Qd7-a7 Ra1xa7 Kg1xf1 Nb4xc6 Kf1-g2 Bg3-e1 Kg2-f1 Ra7xf7 Kf1xe1 Nc6-e5 Bf6xe5 Rf7xf3 Ke1-e2 Rf3-f7 Be5-f6 Rf7-b7 g7-g6
15/32 00:00 531,760 1,360,000 -M7 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Rd1xa1 Qd7-a7 Ra1-b1 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
16/32 00:00 630,322 1,493,654 -M7 Ra8-a1 Rd1xa1 Rg8-a8 Ra1-d1 Ra8-a1 Rd1xa1 Qd7-a7 Ra1-b1 Qa7-a3+ Kb2xa3 Bf6-g5 Bf1-h3+ Bg5-c1+ Rb1xc1+
-
Stan Arts
- Posts: 179
- Joined: Fri Feb 14, 2014 10:53 pm
- Location: the Netherlands
Re: Some engines shows weird pv in this position
They simply seem to resolve the then best move to a mate on the next iteration? So they find some move on depth 1, turns out to be a mate in 1 on depth 2. Then find another move, which might turn out mate in 2, 3 etc. till they settle on Ra1 which is mate in 7.
Seems mostly ok though your engine's output is not. It resolves to a mate in 1 on depth 3 still? It then carries on to depth 4 without even finding another move? Same behaviour at depth 4 and 5.
Could be a number of things but I'd look at things I do at the root that could prevent it from finding a real score/better move first. Do you do aspiration?
Nemeton runs into some shallow mates as well till settling for Ra1. (and some aspiration fishyness but this is all "ok" ahem..)
Seems mostly ok though your engine's output is not. It resolves to a mate in 1 on depth 3 still? It then carries on to depth 4 without even finding another move? Same behaviour at depth 4 and 5.
Could be a number of things but I'd look at things I do at the root that could prevent it from finding a real score/better move first. Do you do aspiration?
Nemeton runs into some shallow mates as well till settling for Ra1. (and some aspiration fishyness but this is all "ok" ahem..)
Code: Select all
2 -29996 0 3417 f2 Bh3+ f1=Q Rxf1+ M2#
2 1320 0 3483 Ra2+ Kxa2 Ra8+
3 -29994 1 5111 Ra2+ Nxa2 f2 Bh3+ f1=Q Rxf1+ M3#
3 1304 1 5891 Ra1 Rxa1 Ra8 Bd3+
4 1304 1 6898 Ra1 Rxa1 Ra8 Bd3+ Rxa1
5 796 6 31568 Ra1 Rxa1 Ra8 Rb1 Ra1 Kxa1
6 801 7 39911 Ra1 Rxa1 Ra8 Rb1 Ra2+ Kxa2 Qa7+
7 769 7 46518 Ra1 <-->
7 569 9 55853 Ra1 <-->
7 297 12 78237 Ra1 Rxa1 Qa7 Rxa7 Kxf1 Nxc6 Rc8 Ra1+
8 329 14 96862 Ra1 <++>
8 328 14 99380 Ra1 <-->
8 -69 17 123382 Ra1 Rxa1 Ra8 Rb1 Ra1 Rxa1 Qa7 Rxa7 Kxf1
9 -101 18 126816 Ra1 <-->
9 -230 21 163128 Ra1 Rxa1 Qa7 Rb1 Qa1+ Kxa1 Ra8+ Kb2 Ra2+ Kxa2
10 -265 23 169114 Ra1 <-->
10 -465 25 182120 Ra1 <-->
10 -865 26 201332 Ra1 <-->
10 -29986 28 206280 Ra1 <-->
10 -29985 34 262590 Ra1 <++>
10 -29986 34 262959 Ra1 Rxa1 Qa7 Rb1 Qa1+ Kxa1 Ra8+ Kb2 Ra2+ Kxa2 f2 Bh3+ f1=Q Rxf1+ M7#
11 -29954 45 372040 Ra1 <++>
11 -29986 46 375501 Ra1 <-->
11 -29986 46 375722 Ra1 Rxa1 Qa7 Rb1 Qa1+ Kxa1 Ra8+ Na2 Rxa2+ Kxa2 f2 Bh3+ f1=Q Rxf1+ M7#
12 -29986 60 501653 Ra1 Rxa1 Qa7 Rb1 Qa1+ Kxa1 Ra8+ Na2 Rxa2+ Kxa2 f2 Bh3+ f1=Q Rxf1+ M7#
13 -29986 84 707467 Ra1 Rxa1 Qa7 Rb1 Qa1+ Kxa1 Ra8+ Na2 Rxa2+ Kxa2 f2 Bh3+ f1=Q Rxf1+ M7#
14 -29986 134 1164736 Ra1 Rxa1 Qa7 Rb1 Qa1+ Kxa1 Ra8+ Na2 Rxa2+ Kxa2 f2 Bh3+ f1=Q Rxf1+ M7# -
op12no2
- Posts: 490
- Joined: Tue Feb 04, 2014 12:25 pm
- Full name: Colin Jenkins
Re: Some engines shows weird pv in this position
Mine shows -M1 at depth 3 after a alpha fail in ID (shown in the PV) - live link:-
http://op12no2.me/toys/lozzadev/fen.htm ... 08&act=ana
It then takes 200 seconds (on my laptop) to find -M7 at depth 13. Ouch
Great position, thank you, I will use it to try and improve things a bit.
http://op12no2.me/toys/lozzadev/fen.htm ... 08&act=ana
It then takes 200 seconds (on my laptop) to find -M7 at depth 13. Ouch
Great position, thank you, I will use it to try and improve things a bit.-
xmas79
- Posts: 286
- Joined: Mon Jun 03, 2013 7:05 pm
- Location: Italy
Re: Some engines shows weird pv in this position
The depth 4 stop with a king in check is pretty suspicious. Some escapes are getting pruned? Other engines output are ok. Mine is ok too:
Code: Select all
--------------------------------------------------------------------------------
time depth move nps score line
--------------------------------------------------------------------------------
00:00:00.005 1 Bf6*h4 3.0K +16.29 9. ... Bf6*h4
10. Bg3*h4
00:00:00.006 1 g7-g6 3.7K +18.19 9. ... g7-g6
10. Nb4*c6 Qd7*c6
00:00:00.007 1 e6-e5 15.0K +18.39 9. ... e6-e5
10. Nb4*c6 Qd7*c6
00:00:00.008 1 f3-f2 13.8K +18.42 9. ... f3-f2
10. Nb4*c6 Qd7*c6
--------------------------------------------------------------------------------
00:00:00.012 1 f3-f2 14.0K +18.42 9. ... f3-f2
10. Nb4*c6 Qd7*c6
--------------------------------------------------------------------------------
00:00:00.013 2 ------ 19.0K +16.69 1 ?
00:00:00.014 2 ------ 19.2K -MATE2 2 ?
00:00:00.015 2 f3-f2?? 23.6K -MATE2 9. ... f3-f2
10. Bf1-h3+ f2-f1=Q
11. Rd1*f1#
00:00:00.018 2 Ra8-a1 30.2K +12.96 9. ... Ra8-a1
10. Kb2*a1
00:00:00.018 2 Ra8-a2 52.1K +13.27 9. ... Ra8-a2+
10. Kb2*a2 f3-f2
11. Nb4*c6 Qd7*c6
--------------------------------------------------------------------------------
00:00:00.022 2 Ra8-a2 45.3K +13.27 9. ... Ra8-a2+
10. Kb2*a2 f3-f2
11. Nb4*c6 Qd7*c6
--------------------------------------------------------------------------------
00:00:00.023 3 ------ 59.0K +11.02 1 ?
00:00:00.024 3 ------ 58.7K +8.52 2 ?
00:00:00.024 3 ------ 60.9K -MATE3 3 ?
00:00:00.024 3 Ra8-a2?? 76.5K -MATE3 9. ... Ra8-a2+
10. Nb4*a2 f3-f2
11. Bf1-h3+ f2-f1=Q
12. Rd1*f1#
00:00:00.027 3 Ra8-a1 99.0K +13.08 9. ... Ra8-a1
10. Kb2*a1 Rg8-a8+
11. Ka1-b1
--------------------------------------------------------------------------------
00:00:00.030 3 Ra8-a1 97.3K +13.08 9. ... Ra8-a1
10. Kb2*a1 Rg8-a8+
11. Ka1-b1
--------------------------------------------------------------------------------
00:00:00.031 4 Ra8-a1 136.0K +13.04 9. ... Ra8-a1
10. Rd1*a1 Rg8-a8
11. Nb4*c6 Ra8*a1
12. Kb2*a1 Qd7*c6
--------------------------------------------------------------------------------
00:00:00.036 4 Ra8-a1 120.9K +13.04 9. ... Ra8-a1
10. Rd1*a1 Rg8-a8
11. Nb4*c6 Ra8*a1
12. Kb2*a1 Qd7*c6
--------------------------------------------------------------------------------
00:00:00.040 5 Ra8-a1 227.8K +12.78 9. ... Ra8-a1
10. Kb2*a1 Qd7-a7+
11. Ka1-b1 Qa7-a4
12. Bf1-e2+ Kg1-g2
--------------------------------------------------------------------------------
00:00:00.045 5 Ra8-a1 205.8K +12.78 9. ... Ra8-a1
10. Kb2*a1 Qd7-a7+
11. Ka1-b1 Qa7-a4
12. Bf1-e2+ Kg1-g2
--------------------------------------------------------------------------------
00:00:00.050 6 Ra8-a1 344.0K +11.42 9. ... Ra8-a1
10. Rd1*a1 Rg8-a8
11. Nb4-a2 Ra8*a2+
12. Kb2*a2 b5-b4
--------------------------------------------------------------------------------
00:00:00.055 6 Ra8-a1 318.9K +11.42 9. ... Ra8-a1
10. Rd1*a1 Rg8-a8
11. Nb4-a2 Ra8*a2+
12. Kb2*a2 b5-b4
--------------------------------------------------------------------------------
00:00:00.061 7 Ra8-a1 540.8K +10.68 9. ... Ra8-a1
10. Rd1*a1 Rg8-a8
11. Nb4-a2 Ra8*a2+
12. Kb2*a2 Qd7-a7+
13. Ka2-b1
--------------------------------------------------------------------------------
00:00:00.067 7 Ra8-a1 503.0K +10.68 9. ... Ra8-a1
10. Rd1*a1 Rg8-a8
11. Nb4-a2 Ra8*a2+
12. Kb2*a2 Qd7-a7+
13. Ka2-b1
--------------------------------------------------------------------------------
00:00:00.072 8 ------ 551.9K +9.23 1 ?
00:00:00.074 8 ------ 586.9K +6.73 2 ?
00:00:00.075 8 ------ 610.7K +4.23 3 ?
00:00:00.085 8 Ra8-a1 887.0K +3.40 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1*a7 Kg1*f1
12. Nb4*c6 Rg8-c8
13. h4-h5 Rc8*c6
14. Ra7*f7
--------------------------------------------------------------------------------
00:00:00.092 8 Ra8-a1 857.0K +3.40 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1*a7 Kg1*f1
12. Nb4*c6 Rg8-c8
13. h4-h5 Rc8*c6
14. Ra7*f7
--------------------------------------------------------------------------------
00:00:00.116 9 Ra8-a1 1.4M +3.44 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1*a7 Kg1*f1
12. Nb4*c6 Rg8-c8
13. h4-h5 f3-f2
--------------------------------------------------------------------------------
00:00:00.126 9 Ra8-a1 1.4M +3.44 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1*a7 Kg1*f1
12. Nb4*c6 Rg8-c8
13. h4-h5 f3-f2
--------------------------------------------------------------------------------
00:00:00.167 10 Ra8-a1 1.9M +3.46 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1*a7 Kg1*f1
12. Nb4*c6 Rg8-c8
13. h4-h5 f3-f2
14. Bg3-c7
--------------------------------------------------------------------------------
00:00:00.180 10 Ra8-a1 1.9M +3.46 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1*a7 Kg1*f1
12. Nb4*c6 Rg8-c8
13. h4-h5 f3-f2
14. Bg3-c7
--------------------------------------------------------------------------------
00:00:00.219 11 ------ 2.1M +1.65 1 ?
00:00:00.221 11 ------ 2.1M -0.85 2 ?
00:00:00.233 11 ------ 2.2M -3.37 3 ?
00:00:00.292 11 Ra8-a1 2.7M -4.78 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1-c1 Qa7-a3+
12. Kb2*a3 Bf6-g5
13. h4*g5 Rg8-a8+
14. Ka3-b3 Ra8-a1
15. Rc1*a1
--------------------------------------------------------------------------------
00:00:00.318 11 Ra8-a1 2.7M -4.78 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1-c1 Qa7-a3+
12. Kb2*a3 Bf6-g5
13. h4*g5 Rg8-a8+
14. Ka3-b3 Ra8-a1
15. Rc1*a1
--------------------------------------------------------------------------------
00:00:00.351 12 ------ 2.8M -MATE9 1 ?
00:00:00.589 12 Ra8-a1?? 3.3M -MATE7 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1-b1 Qa7-a3+
12. Kb2*a3 Rg8-a8+
13. Ka3-b3 Ra8-a1
14. Rb1*a1 Bf6-g5
15. Bf1-h3+ Bg5-c1
16. Ra1*c1#
--------------------------------------------------------------------------------
00:00:00.634 12 Ra8-a1?? 3.3M -MATE7 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1-b1 Qa7-a3+
12. Kb2*a3 Rg8-a8+
13. Ka3-b3 Ra8-a1
14. Rb1*a1 Bf6-g5
15. Bf1-h3+ Bg5-c1
16. Ra1*c1#
--------------------------------------------------------------------------------
00:00:01.006 13 Ra8-a1?? 3.8M -MATE7 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1-b1 Qa7-a3+
12. Kb2*a3 Rg8-a8+
13. Ka3-b3 Ra8-a1
14. Rb1*a1 Bf6-g5
15. Bf1-h3+ Bg5-c1
16. Ra1*c1#
--------------------------------------------------------------------------------
00:00:01.128 13 Ra8-a1?? 3.9M -MATE7 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1-b1 Qa7-a3+
12. Kb2*a3 Rg8-a8+
13. Ka3-b3 Ra8-a1
14. Rb1*a1 Bf6-g5
15. Bf1-h3+ Bg5-c1
16. Ra1*c1#
--------------------------------------------------------------------------------
00:00:01.882 14 Ra8-a1?? 3.9M -MATE7 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1-b1 Qa7-a3+
12. Kb2*a3 Rg8-a8+
13. Ka3-b3 Ra8-a1
14. Rb1*a1 Bf6-g5
15. Bf1-h3+ Bg5-c1
16. Ra1*c1#
--------------------------------------------------------------------------------
00:00:02.114 14 Ra8-a1?? 3.9M -MATE7 9. ... Ra8-a1
10. Rd1*a1 Qd7-a7
11. Ra1-b1 Qa7-a3+
12. Kb2*a3 Rg8-a8+
13. Ka3-b3 Ra8-a1
14. Rb1*a1 Bf6-g5
15. Bf1-h3+ Bg5-c1
16. Ra1*c1#-
hgm
- Posts: 27792
- Joined: Fri Mar 10, 2006 10:06 am
- Location: Amsterdam
- Full name: H G Muller
Re: Some engines shows weird pv in this position
Fairy-Max:
Code: Select all
dep score nodes time (not shown: tbhits knps seldep)
15 -79.93 14.6M 0:17.42 a8a1 d1a1 d7a7 a1b1 a7a3 b2a3 g8a8 a3b3 a8a1 b1a1 f3f2 f1h3 f2f1 a1f1
14 -79.93 7.68M 0:09.31 a8a1 d1a1 g8a8 a1b1 a8a1 b2a1 d7a7 a1b2 a7a3 b2a3 f6g5 f1h3 g5c1 b1c1
13 -79.93 4.49M 0:05.54 a8a1 d1a1 g8a8 a1b1 a8a1 b2a1 d7a7 a1b2 a7a3 b2a3 f6g5 f1h3 g5c1 b1c1
12 -79.93 2.92M 0:03.67 a8a1 d1a1 g8a8 a1b1 a8a1 b2a1 d7a7 a1b2
11 -79.93 1.82M 0:02.34 a8a1 d1a1 g8a8 a1b1 a8a1 b2a1 d7a7 a1b2
10 -1.74 1.07M 0:01.39 a8a1 d1a1 g8a8 a1d1 a8a1 d1a1 d7a7 a1a7 g1f1 b4c6
9 +8.59 351138 0:00.46 a8a1 b2a1 d7a7 a1b2 a7a4 d1e1 f3f2 e1a1 a4a1 b2a1 g8a8
8 +8.60 228342 0:00.31 a8a1 b2a1 d7a7 a1b2 a7a4 d1a1 a4a1 b2a1 g8a8 a1b2 f3f2 b4c6 g1f1
7 +8.09 186207 0:00.26 a8a1 b2a1 d7a7 a1b2 a7a4 d1a1 a4a1 b2a1 g8a8
6 +9.41 133891 0:00.18 a8a1 b2a1 g8a8 a1b1 f3f2 f1b5 f2f1 d1f1
5 +10.63 61319 0:00.09 a8a1 d1a1 g8a8 a1b1 f3f2 b4c6 d7c6 f1b5
5 +9.92 54069 0:00.07 a8a2 b4a2 f3f2 f1h3 f2f1 d1f1
4 +11.39 39326 0:00.06 a8a2 b4a2 f3f2 f1b5
4 -79.98 35321 0:00.04 f3f2 f1h3 f2f1 d1f1
3 +13.48 2341 0:00.00 f3f2 f1b5 f2f1 d1f1
2 +15.16 614 0:00.00 f3f2 b4c6
1 +15.16 610 0:00.00 f3f2 b4c6 d7c6 f1b5
-
op12no2
- Posts: 490
- Joined: Tue Feb 04, 2014 12:25 pm
- Full name: Colin Jenkins
Re: Some engines shows weird pv in this position
Bloody hell!
I was massively over predicating reductions, pruning and null move etc in the presence of abs(score) mate values. Relaxed it all and the 200 seconds from depth 12 to 13 itself reduced to a very nice 0.
Probably something in-between called for, but I'm very happy to discover this. Thank you Tony for the post
I was massively over predicating reductions, pruning and null move etc in the presence of abs(score) mate values. Relaxed it all and the 200 seconds from depth 12 to 13 itself reduced to a very nice 0.
Code: Select all
0.63 13 (-7mate) Ra1 Rxa1 Ra8 Rb1 Ra1 Kxa1 Qa7 Kb2 Qa1 Rxa1 f2 Bh3 f1q Rxf1
ALPHA 13 -922 >= -922 < 524
0.63 12 (-199cp) Ra1 Rxa1 Ra8 Rd1 Ra1 Rxa1 Qa7 Rxa7 Kxf1 Nxc6 Kg2 Bb8
0.12 11 (383cp) Ra1 Rxa1 Qa7 Rxa7 Kxf1 Nxc6 Kg2 Rxf7 Kxg3 h5 Ra8
0.12 10 (529cp) Ra1 Rxa1 Ra8 Rd1 Ra1 Rxa1 f2 Bxb5 f1q Rxf1
0.12 9 (703cp) Ra1 Rxa1 Ra8 Rd1 Ra2 Nxa2 f2 Bh3 f1q Rxf1
0.12 8 (1094cp) Ra1 Rxa1 Ra8 Rd1 f2 Bxb5 f1q Rxf1
0.12 7 (1094cp) Ra1 Rxa1 Ra8 Rd1 f2 Bxb5 f1q
0.12 6 (1266cp) Ra1 Rxa1 Ra8 Rd1 Nd6 Nxc6
0.12 5 (1266cp) Ra1 Kxa1 Ra8 Kb2 Nd6
0.12 5 (1237cp) Ra2 Nxa2 f2 Bh3 f1q Rxf1
0.12 4 (1623cp) f2 Bxb5 f1q Rxf1
0 3 (1623cp) f2 Bxb5 f1q
0 3 (1322cp) Ra2 Nxa2 Nd6
0 3 (-1mate) Nd6 Bh3
ALPHA 3 1720 >= 1720 < 1864
0 2 (1792cp) Nd6 Nxc6
0 1 (1792cp) Nd6
0 1 (1693cp) Bxh4
0 1 (1685cp) Bxd4
Lozza version 1.13 build 6734 is alive
-
SMIRF
- Posts: 91
- Joined: Wed Mar 26, 2014 4:29 pm
- Location: Buettelborn/Hessen/Germany
Re: Some engines shows weird pv in this position
Old Smirf shows:
Code: Select all
00:01.0 End of thinking (unavoidable)
00:00.8 (09.00-) -16.75 8...Ta1 (=/=) 9.Txa1 Ta8 10.Te1 Ta1 11.Kxa1 f2 12.Tb1 Da7+ 13.Sa2
00:00.8 (09.00-) -6.090 8...Ta1 (=/=) 9.Txa1 Ta8 10.Te1 Ta1 11.Kxa1 f2 12.Tb1 Da7+ 13.Sa2
00:00.7 (09.00-) +3.156 8...Ta1 (=/=) 9.Txa1 Ta8 10.Te1 Ta1 11.Kxa1 f2 12.Tc1 Da7+ 13.Kb1 Ld7 14.Lh3+
00:00.3 (08.01+) -24.81 8...Ta1 (=/=) 9.Txa1 Ta8 10.Td1 Ta1 11.Txa1 Da7 12.Tb1 Da2+ 13.Sxa2 f2 14.Lh3+ f1=D 15.Txf1+
00:00.2 (08.00-) -24.83 8...Ta1 (=/=) 9.Txa1 Ta8 10.Td1 Ta1 11.Txa1 Da7 12.Tb1 Da2+ 13.Sxa2 f2 14.Lh3+
00:00.1 (07.00-) -0.266 8...Ta1 (=/=) 9.Txa1 Ta8 10.Td1 Ta2+ 11.Sxa2 f2 12.Lh3+
00:00.0 (06.00-) +6.941 8...Ta1 (=/=) 9.Kxa1 Da7+ 10.Kb2 Da4 11.Sc2