50 move counter in FEN and GUIs

[Jouni]

I haven't seen any difference in analysis with different values for 50 move counter. I use Friz and Arena GUI. Are GUIs buggy!?

[hgm]

In WinBoard it matters. E.g. pasting a FEN = "4k3/8/8/8/8/8/8/R3K3 w Q - 90 1" with Stockfish-Variant as analysis engine gives

Code: Select all

 20	  0.00 	217877	0:00.14	1. Ra7 Kd8 2. Kf2 Ke8 3. Kg3 Kd8 4. Ra3 Kd7 5. Ra1 Ke6 
 19	  0.00 	199181	0:00.13	1. Ra7 Kd8 2. Kf2 Ke8 3. Kg3 Kd8 4. Ra3 Kd7 5. Ra1 Ke6 
 18	  0.00 	184347	0:00.12	1. Ra7 Kd8 2. Kf2 Ke8 3. Kg3 Kd8 4. Ra3 Kd7 5. Ra1 Ke6 
 17	  0.00 	170630	0:00.12	1. Ra7 Kd8 2. Kf2 Ke8 3. Kg3 Kd8 4. Ra3 Kd7 5. Ra1 Ke6 
 16	  0.00 	160983	0:00.11	1. Ra7 Kd8 2. Kf2 Ke8 3. Kg3 Kd8 4. Ra3 Kd7 5. Ra1 Ke6 
 15	  0.00 	160523	0:00.11	1. Ra7 Kd8 2. Kf2 Ke8 3. Kg3 Kd8 4. Ra3 Kd7 5. Ra1 Ke6 
 14	  0.00 	145504	0:00.10	1. Ra7 Kd8 2. Kf1 Kc8 3. Kg2 Kd8 4. Rb7 Ke8 5. Kf1 Kd8 
 13	  0.00 	143317	0:00.10	1. Ra7 Kd8 2. Kf1 Kc8 3. Kg2 Kd8 4. Rb7 Ke8 5. Kf1 Kd8 
 12	+0.08 	87789  	0:00.08	1. Rd1 Ke7 2. Kf2 Ke8 3. Rc1 Ke7 4. Rc8 Kd7 5. Kg3 Kxc8 6. Kh3 Kd7 7. Kh4 Kd6 
 11	+0.08 	82575  	0:00.07	1. Rd1 Ke7 2. Kf2 Ke8 3. Rc1 Ke7 4. Rc8 Kd7 5. Kg3 Kxc8 6. Kh3 Kd7 
 10	+0.08 	53634  	0:00.05	1. Kd2 Kd7 2. Kc3 Ke7 3. Rf1 Kd6 4. Rf8 Ke7 5. Kb4 Kxf8 
  9	+46.02 	6078    	0:00.00	1. Kd2 Kd7 2. Kc3 Ke7 3. Kd4 Kd6 4. Rc1 Ke6 5. Rd1 
  8	+46.02 	5090    	0:00.00	1. Kd2 Kd7 2. Kc3 Ke7 3. Kd4 Kd7 4. Rc1 Ke7 
  7	+46.02 	3443    	0:00.00	1. Kd2 Kd7 2. Kc3 Ke7 3. Kd4 Kd7 4. Rc1 
  6	+45.94 	1645    	0:00.00	1. Kd2 Kd7 2. Kc3 Ke7 3. Rc1 Kd7 
  5	+45.94 	880      	0:00.00	1. Kd2 Kd7 2. Kc3 Ke7 3. Rc1 
  4	+45.86 	385      	0:00.00	1. Kd2 Kd7 2. Rb1 Ke7 
  3	+45.86 	196      	0:00.00	1. Kd2 Kd7 2. Rb1 
  2	+45.86 	92        	0:00.00	1. Kd2 Kd7 
  1	+45.86 	17        	0:00.00	1. Kd2 
  0	Found 0 tablebases

so it is clearly aware that the number of remaining moves is too small to force mate. With the ply counter at 0 it gives a mate in 12.

It apparently matters what I have did before, though; if I do the search with ply counter = 0 first, the low depths with ply counter = 90 report mate in 12, after which the score falls back to +9, to rise again to +46 before falling to 0.08. Apparently the hash table is not cleared between the searches. So the effect of the ply counter could be masked by hash hits on the results from an earlier search with a different ply counter.

[Jouni]

My mistake. I misunderstood SF github discussion. This position is NOT 50 move draw

[d]8/1p2KP2/1p4q1/1Pp5/2P5/N1Pp1k2/3P4/1N6 b - - 76 40

SF analysis

40...Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Qc7 46.b6 Qc6 47.Nb5 Ke2 48.Nc7 Kd1 49.Nd5 Kc2 50.Na3+ Kxd2 51.Nf4 Qe4 52.Nb1+ Kc2 53.Na3+ Kb3 54.Nxd3 Qxd3 55.Nb5 Kxc4 56.Nc7 Qf3 57.Kb8 Qc6 58.Kc8 Kxc3 59.Kd8 Qxb6 60.Kd7 Qxc7+ 61.Kxc7 Kd4 62.Kb6 c4 63.Kc7 c3 64.Kd7 c2 65.Ke6 c1Q 66.Kf6 Qc6+ 67.Kf5 Qb6 68.Kf4 Qf6+ 69.Kg3 Ke3 70.Kg2 Qg5+ 71.Kf1 Qg4 72.Ke1 Qg1#
-+ (-#33) Depth: 72/66 00:05:41 5078mN

[MikeB]

My mistake. I misunderstood SF github discussion. This position is NOT 50 move draw

[d]8/1p2KP2/1p4q1/1Pp5/2P5/N1Pp1k2/3P4/1N6 b - - 76 40

SF analysis

40...Qg5+ 41.Ke8 Qe5+ 42.Kd7 Qf6 43.Kc7 Qxf7+ 44.Kxb6 Qe7 45.Ka7 Qc7 46.b6 Qc6 47.Nb5 Ke2 48.Nc7 Kd1 49.Nd5 Kc2 50.Na3+ Kxd2 51.Nf4 Qe4 52.Nb1+ Kc2 53.Na3+ Kb3 54.Nxd3 Qxd3 55.Nb5 Kxc4 56.Nc7 Qf3 57.Kb8 Qc6 58.Kc8 Kxc3 59.Kd8 Qxb6 60.Kd7 Qxc7+ 61.Kxc7 Kd4 62.Kb6 c4 63.Kc7 c3 64.Kd7 c2 65.Ke6 c1Q 66.Kf6 Qc6+ 67.Kf5 Qb6 68.Kf4 Qf6+ 69.Kg3 Ke3 70.Kg2 Qg5+ 71.Kf1 Qg4 72.Ke1 Qg1#
-+ (-#33) Depth: 72/66 00:05:41 5078mN

You were right the first time, it was an original post on talkchess and the position should be evaluated as a draw and SF misevaluated with a mate score no less:
http://www.talkchess.com/forum3/viewtop ... =2&t=72166

Current dev SF will see it is a draw as it was fixed with this patch:
https://github.com/official-stockfish/S ... /pull/2381

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 68	+0.07!	478.8M	0:15.78	Qg5+! 
 67	  0.00 	476.7M	0:15.72	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg8 Qg5+ Kh7 Qf6 Kg8 
 67	+0.14!	476.3M	0:15.70	Qg5+! 
 67	+0.07!	462.7M	0:15.22	Qg7! 
 66	  0.00 	458.3M	0:15.07	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Ke4 Ke7 Qg5+ Ke8 Qg6 
 66	+0.14!	454.2M	0:14.94	Qg7! 
 66	+0.07!	451.5M	0:14.85	Qg5+! 
 65	  0.00 	451.3M	0:14.84	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 
 65	+0.14!	451.2M	0:14.84	Qg5+! 
 65	+0.07!	451.1M	0:14.84	Qg5+! 
 64	  0.00 	450.7M	0:14.82	Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Kg4 Kg7 Qe5+ Kg8 Qg5+ Kh8 Qh6+ Kg8 
 64	+0.23!	450.4M	0:14.81	Qg5+! 
 64	+0.14!	448.6M	0:14.75	Qg7! 
 64	+0.07!	448.5M	0:14.75	Qg7! 
 63	  0.00 	438.5M	0:14.40	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 
 62	  0.00 	437.9M	0:14.38	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 
 61	  0.00 	437.5M	0:14.37	Qg7 Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kh7 Qf6 Kg8 
 61	+0.07!	436.2M	0:14.33	Qg7! 
 60	  0.00 	435.5M	0:14.30	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 60	+0.07!	435.1M	0:14.29	Qg5+! 
 59	  0.00 	435.0M	0:14.29	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 59	+0.07!	434.9M	0:14.29	Qg5+! 
 58	  0.00 	434.9M	0:14.28	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 58	+0.07!	434.9M	0:14.28	Qg5+! 
 57	  0.00 	434.8M	0:14.28	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 57	+0.07!	434.8M	0:14.28	Qg5+! 
 56	  0.00 	434.8M	0:14.28	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 56	+0.07!	434.7M	0:14.28	Qg5+! 
 55	  0.00 	434.7M	0:14.28	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 
 55	+0.07!	434.7M	0:14.28	Qg5+! 
 54	  0.00 	434.6M	0:14.28	Qe4+ Kd7 Qf4 Ke7 
 54	+0.07!	434.5M	0:14.27	Qe4+! 
 53	  0.00 	434.5M	0:14.27	Qe4+ Kd7 Qf4 Ke7 Qg5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kg4 Kg7 Qe5+ Kg8 Qg5+ Kh8 Qf6+ Kg8 
 53	+0.07!	434.4M	0:14.27	Qe4+! 
 52	  0.00 	434.3M	0:14.26	Qe4+ Kd7 Qf4 Ke7 Qg5+ Kd7 
 51	  0.00 	434.3M	0:14.26	Qe4+ Kd7 Qf4 Ke7 
 50	  0.00 	434.2M	0:14.26	Qe4+ Kd7 Qf4 Ke7 Qg5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kg4 Kg7 Qe5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Qe4 Kg8 
 50	+0.07!	433.7M	0:14.25	Qe4+! 
 49	  0.00 	433.7M	0:14.24	Qe4+ Kd7 Qf4 Ke7 
 49	+0.07!	433.6M	0:14.24	Qe4+! 
 48	  0.00 	433.3M	0:14.23	Qe4+ Kd7 Qf4 Ke7 Qg5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kh7 Qf6 Kg8 Qg5+ 
 48	+0.07!	433.1M	0:14.22	Qe4+! 
 47	  0.00 	433.1M	0:14.22	Qe4+ Kd7 Qf4 Ke7 
 47	+0.07!	433.0M	0:14.22	Qe4+! 
 46	  0.00 	433.0M	0:14.22	Qe4+ Kd7 Qf4 Ke7 Qg5+ Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kh7 Qh5+ Kg7 Qg4+ 
 46	+0.29?	432.8M	0:14.21	Qe4+? 
 46	+13.22?	432.7M	0:14.21	Qe4+ Kd7? 
 45	+99.22!	169.9M	0:05.45	Qe4+! 
 45	+47.70!	169.8M	0:05.45	Qe4+! 
 45	+41.11!	169.7M	0:05.44	Qe4+! 
 45	+20.57?	167.7M	0:05.38	Qe4+ Kd7? 
 45	+24.83?	167.0M	0:05.35	Qe4+ Kd7? 
 45	+42.48?	166.9M	0:05.35	Qe4+ Kd7? 
 45	+44.31?	166.9M	0:05.35	Qe4+ Kd7? 
 45	+48.68?	166.8M	0:05.35	Qe4+ Kd7? 
 45	+49.77?	166.8M	0:05.34	Qe4+ Kd7? 
 45	+51.67?	166.7M	0:05.34	Qe4+ Kd7? 
 44	+99.22 	166.6M	0:05.34	Qe4+ Kd7 Qf5+ Kc7 Qf6 f8=B Qxf8 Kxb6 Qe7 Ka7 Ke2 Kb6 Kd1 Ka7 Qc7 b6 Qe7 Nb5 Qd7 Nc7 Qc6 Nd5 Kc1 Na3 Kxd2 Nb5 Ke2 Ne7 Qd7 Nd5 d2 Kb8 d1=Q Nbc7 Qc6 Ka7 Qda4+ Kb8 Kf3 Ne7 Qd7 Ned5 Qxc4 Ne7 Qxe7 Ka7 Qf6 Kxb7 
 43	+99.22 	166.2M	0:05.32	Qe4+ Kd7 Qf5+ Kc7 Qf6 f8=B Qxf8 Kxb6 Qe7 Ka7 Ke2 Kb6 Kd1 Ka7 Qc7 b6 Qe7 Nb5 Qd7 Nc7 Qc6 Nd5 Kc1 Na3 Kxd2 Nb5 Ke2 Ne7 Qd7 Nd5 d2 Kb8 d1=Q Nbc7 Qc6 Ka7 Qda4+ Kb8 Kf3 Ne7 Qd7 Ned5 Qxc4 Ne7 Qxe7 Ka7 
 42	+99.22 	40.7M  	0:01.26	Qe4+ Kd7 Qf4 Ke6 Qh6+ Ke7 Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=R Qxf8 Kxb6 Ke5 Kxb7 Qf7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Ka5 Qxb1 Ka6 Qa2+ Kb7 Qxd2 Nb5 Qg2+ Kb6 Qa2 Na7 d2 Nc6 Qb3+ Ka7 d1=Q Nb4 cxb4 
 41	+99.22 	36.3M  	0:01.11	Qg7 Ke8 Qg6 Ke7 Qh7 Ke8 Qe4+ Kd7 Qf4 Ke6 Qb8 Ke7 Qe5+ Kd7 Qf6 Kc7 Kf4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Na3 Qxd2 N7b5 Kc6 Ka5 Qa2 Ka6 d2 Na7+ Kd7 Nb5 
 40	+99.22 	35.1M  	0:01.08	Qg7 Ke8 Qg6 Ke7 Qg5+ Kd7 Qf6 Kc7 Kf4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qf7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Na3 Qxd2 N7b5 Kc6 Ka5 Qa2 Ka6 d2 Na7+ Kd7 Nb5 d1=Q Kb7 Qdb3 Kb6 Qxb5+ cxb5 
 39	+99.22 	34.4M  	0:01.06	Qg7 Ke8 Qg6 Ke7 Qe4+ Kd7 Qf4 Ke6 Qh6+ Kd7 Qf6 Kc7 Kf4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Na3 Qxd2 N7b5 Kc6 Ka5 Qa2 Ka6 d2 Na7+ Kd7 Nb5 d1=Q Kb7 Qdb3 
 38	+99.22 	34.2M  	0:01.05	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Na3 Qxd2 N7b5 Kc6 Ka5 Qa2 Ka6 d2 Na7+ Kd7 Nb5 d1=Q Kb7 Qdb3 Kb6 Qaxa3 Kb7 Qaa2 
 37	+99.22 	34.0M  	0:01.05	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Na3 Qxd2 N7b5 Kc6 Ka5 Qa2 Ka6 d2 Na7+ Kd7 Nb5 d1=Q Kb7 Qdb3 Kb6 Qaxa3 Kb7 
 36	+99.22 	33.9M  	0:01.04	Qg7 Ke8 Qg6 Ke7 Qg5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Nb5 Qxb1 Ka5 Kc6 Ka4 Qa2+ Na3 Kb7 Kb5 Qxd2 Nb1 Qa2 Nd2 Qb2+ Ka4 
 35	+99.22 	33.8M  	0:01.04	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Ka5 Qxb1 Nb5 Kc6 Ka4 Qa2+ Na3 Kb7 Kb5 Qxd2 Nb1 Qa2 Nd2 Qb2+ Ka4 Qxd2 
 34	+99.22 	33.8M  	0:01.04	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Ka5 Qxb1 Nb5 Kc6 Ka4 Qa2+ Na3 Kb7 Kb5 Qxd2 Nb1 Qa2 Nd2 Qb2+ Ka4 
 33	+99.22 	33.7M  	0:01.04	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Ka5 Qxb1 Nb5 Kc6 Ka4 Qa2+ Na3 Kb7 Kb5 Qxd2 Nb1 Qa2 Nd2 
 32	+99.22 	33.7M  	0:01.04	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Ka5 Qxb1 Nb5 Kc6 Ka4 Qa2+ Na3 Kb7 Kb5 Qxd2 Nb1 Qa2 Nd2 Qb2+ Ka4 Qxd2 Kb3 
 31	+99.22 	33.7M  	0:01.04	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Nb5 Qxb1 Ka5 Kc6 Ka4 Qa2+ Na3 Kb7 Kb5 Qxd2 
 30	+99.22 	33.6M  	0:01.03	Qe4+ Kd7 Qf4 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Ka5 Qxb1 Ka6 Qa2+ Kb7 Qxd2 Nb5 Qa2 Kb6 d2 
 29	+99.22 	33.5M  	0:01.03	Qe4+ Kd7 Qf4 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Ka5 Qxb1 Ka6 Qa2+ Kb7 
 28	+14.26 	10.9M  	0:00.34	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Kf4 f8=R Qxf8 Kxb6 Ke5 Kxb7 Qf7+ Ka6 Qe8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 N1a3 Qxd2 Na7+ Kd7 N7b5 Qa2 Ka5 Kc6 Ka6 d2 Na7+ Kd7 Kb7 
 27	+11.54 	9.06M  	0:00.28	Qh7 Ke8 Qg6 Ke7 Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=B Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qd8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 N1a3 Qxd2 
 26	+8.83 	7.90M  	0:00.24	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Ke4 f8=Q Qxf8 Kxb6 Ke5 Kxb7 Qe7+ Ka6 Qd8 b6 Qa8+ Kb5 Kd6 b7 Qxb7+ Ka4 Qb2 Nb5+ Kc6 Na7+ Kd7 Na3 Qxd2 
 25	+5.83 	6.18M  	0:00.19	Qh7 Kf6 Qh6+ Ke7 Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke2 b6 Kd1 Nb5 Qd7 N5a3 Qc6 Kb8 Qxb6 Kc8 Qc6+ Kd8 Qd6+ Ke8 Kc1 Kf7 Kb2 Kg7 Qe6 Kh7 Qf6 Kg8 Qe7 
 24	+5.77 	6.02M  	0:00.19	Qh7 Kf6 Qh6+ Ke7 Qg7 Ke8 Qe5+ Kd8 Qf6+ Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke2 b6 Qd7 Nb5 Kd1 Kb8 Qc6 N5a3 Qxb6 Kc8 Qc6+ Kb8 Kc1 Ka7 Kb2 Kb8 Qd7 Ka7 b5+ Kb6 b4 Nb5 Kxb1 Kxc5 bxc3 Nxc3+ Kc1 Ne4 Kb2 Nd6 Qc7+ Kd5 
 23	+5.14 	1.94M  	0:00.06	Qg7 Ke8 Qg6 Kf8 Ke4 Ke7 Qg5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke5 Kb6 Qd7 Ka5 Qd8+ Ka4 Ke4 Kb3 Qf6 Ka2 Kf3 Kb2 Ke2 Kc1 b6 Nc2 dxc2 
 22	+4.89 	1.28M  	0:00.04	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke2 Kb6 Kd1 Ka5 Kc1 Kb6 Kb2 Ka7 Qc7 b6 Qc6 Ka8 Kc1 Ka7 Kd1 Nb5 Kc2 N5a3+ Kc1 Ka8 Qxb6 Kb8 Kb2 Kc8 Ka2 Kd7 
 21	+4.86 	1.13M  	0:00.04	Qg7 Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Ke4 Kg7 Qg4+ Kf6 Qf5+ Ke7 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke5 Kb6 Qd7 Ka5 Qd8+ Ka4 Ke4 
 20	+4.65 	839863	0:00.03	Qg7 Ke8 Qe5+ Kd8 Qd6+ Ke8 Qe6+ Kf8 Ke4 Kg7 Qe5+ Kg8 Qg5+ Kf8 Kf4 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke5 Kb6 Qd7 Ka5 Qd8+ Ka4 
 19	+4.33 	786177	0:00.03	Qg7 Ke8 Qe5+ Kd8 Qf6+ Ke8 Qe6+ Kf8 Ke4 Kg7 Qe5+ Kg8 Qg5+ Kf8 Kf4 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka5 Qd8+ Ka4 Ke4 Kb3 Qf6 Ka2 Kf3 Kb2 Ke2 Kb3 Qf2 
 18	+4.37 	518360	0:00.02	Qg7 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke2 b6 Kd1 Ka8 Kc1 Kb8 Qe4 Ka8 Qc6 Ka7 Kb2 Kb8 
 17	+3.52 	488617	0:00.02	Qg7 Ke8 Qe5+ Kd8 Qd6+ Ke8 Qe6+ Kf8 Kf4 Kg7 Qe7 Kg6 Ke5 Kg7 Qg5+ Kf8 Kf4 Ke8 Qe5+ Kd7 
 16	+3.52 	405564	0:00.02	Qg5+ Kf8 Ke4 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke5 Kb6 Qd7 Ka5 Qd8+ Ka4 Qf6 Kb3 Ke4 Kb2 Kf3 Ka2 Ke2 Kb3 Qg7 Kb2 b6 Ka2 
 15	+3.53 	376965	0:00.01	Qg5+ Kf8 Ke4 Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke5 Kb6 Qd7 Ka5 Qd8+ Ka4 Ke4 Kb3 Qf6 Kb2 Kf3 Kb3 b6 Ka2 Qe6 Kb3 Ke2 Kb2 
 14	+3.45 	294392	0:00.01	Qg5+ Ke8 Qe5+ Kd7 Qf6 Kc7 Qxf7+ Kxb6 Qe7 Ka7 Ke2 Kb6 Kd1 Ka7 Kc1 Kb6 Kb2 Ka7 Ka2 Kb6 Kb3 Ka7 
 13	+3.59 	197137	0:00.01	Qg5+ Ke8 Qe5+ Kd7 Qf6 f8=R Qxf8 Kc7 Qf7+ Kxb6 
 12	+2.06 	170365	0:00.01	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Kf4 Kg7 Qe5+ Kg8 Qg5+ Kf8 Ke5 Ke8 Qg6 Ke7 
 11	+2.54 	120066	0:00.01	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Ke2 Kg7 
 10	+1.90 	102160	0:00.00	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 
  9	+1.77 	84998  	0:00.00	Qe4+ Kf6 Qf4+ Kg7 Qe5+ Kg8 Qg5+ Kh7 Qf6 Kg8 Qg6+ Kf8 Qg3 Ke7 Qg5+ Ke8 
  8	+1.78 	45598  	0:00.00	Qg5+ Ke8 Qe5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kh8 Qf6+ Kg8 
  7	+1.78 	40388  	0:00.00	Qg5+ Kd7 Qf6 Ke8 Qe6+ Kf8 Qe5 Kg8 Qg5+ Kh8 
  6	+1.74 	29425  	0:00.00	Qg5+ Kd7 Qf6 Ke8 Qe5+ Kd7 
  5	+1.17 	23266  	0:00.00	Qg5+ Kf8 Qf6 Ke8 Qe5+ Kd7 Qh8 
  4	+1.22 	8412    	0:00.00	Qe4+ Kd6 Qf4+ Ke7 Qe5+ Kd7 Qf5+ Ke7 
  3	+1.33 	5669    	0:00.00	Qe4+ Kd6 Qf4+ Ke7 Qe5+ Kd7 
  2	+1.33 	4044    	0:00.00	Qe4+ Kd6 Qf4+ Ke7 
  1	+1.01 	2261    	0:00.00	Qg7 

edit: This is the result of the well known GHI problem , and the patch SF used does not solve every problem corrected. Entries saved in the transposition table do not contain the move count used in evaluating the position - so a position that is mate with one move count , may be a draw with higher 50 move draw count.

https://www.chessprogramming.org/Graph_ ... nteraction