Surprisingly difficult stalemate problem (for some engines)

[Vinvin]

I'd say Stockfish also has trouble here.
I run on one core to emulate the speed of a phone (~ 1.7 Mn/s) and it needs 54 seconds (about 100 Mnodes) to find the draw !
That's way too much.

In comparison, Houdini needs 0.1 second, only 300 Knodes.

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FEN: 8/5R2/1p2p1pk/p6p/P2R3P/8/r5r1/7K w - - 0 1

Stockfish_20060117_x64_modern:
Found 511 tablebases
...
 28/53	00:38	 68 688 423	1 792 963	-9,12	1.Rc7 e5 2.Rd8 Rh2+ 3.Kg1 Rxh4 4.Re7 Re4 5.Kf1 Raxa4 6.Re6 b5 7.Rg8 Ra1+ 8.Kf2 Rg4 9.Re7 b4 10.Rh8+ Kg5 11.Rxe5+ Kh4 12.Ke2 a4 13.Rb8 a3 14.Ra5 Ra2+ 15.Kd3 Rb2 16.Ra6
 29/37-	00:39	 70 732 363	1 796 149	-9,22	1.Rc7 e5
 29/45-	00:40	 73 167 658	1 799 101	-9,32	1.Rc7 e5
 29/50-	00:47	 85 111 870	1 810 813	-9,68	1.Rc7 e5
 29/56+	00:54	 98 568 827	1 815 330	-9,25	1.Rh7+
 29/56+	00:54	 98 568 971	1 815 299	 0,00	1.Rh7+
 29/56	00:54	 98 571 608	1 815 315	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kf8
 30/11	00:54	 98 576 099	1 815 330	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kxe7
 31/12	00:54	 98 583 728	1 815 137	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kf8
 32/11	00:54	 98 587 334	1 815 136	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kf8

Code: Select all

Houdini_15_x64:
...
 12/27	00:00	 156 833	2 904 000	-3,26	1.Rc4 Rh2+ 2.Kg1 e5 3.Re4 Rhb2 4.Rc4 Rg2+ 5.Kf1 Rgd2 6.Kg1 Rg2+ 7.Kf1
 13/27	00:00	 231 029	2 961 000	-3,26	1.Rc4 Rh2+ 2.Kg1 e5 3.Re4 Rhb2 4.Rc4 Rg2+ 5.Kf1 Rgd2 6.Kg1 Re2 7.Kf1 Rh2 8.Kg1 Rag2+ 9.Kf1 Rb2 10.Kg1 Rbe2 11.Rf3 Reg2+ 12.Kf1 Rd2 13.Kg1 Rhg2+ 14.Kf1 Ra2 15.Rf7 Rgd2
 13/30+	00:00	 291 411	3 004 000	-3,11	1.Rh7+
 13/30+	00:00	 292 345	3 013 000	-0,17	1.Rh7+
 13/30	00:00	 293 183	2 991 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 14/30	00:00	 293 918	2 999 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 15/30	00:00	 296 947	2 999 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 16/30	00:00	 300 387	3 003 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 17/30	00:00	 306 602	3 035 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 18/30	00:00	 317 097	3 049 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 19/30	00:00	 333 804	3 119 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 20/30	00:00	 363 791	3 191 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 21/30	00:00	 414 969	3 267 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 22/30	00:00	 482 384	3 373 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 23/30	00:00	 588 154	3 521 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 24/30	00:00	 724 605	3 659 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7
 25/31	00:00	 923 391	3 784 000	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kh8 3.Rh7+ Kg8 4.Rg7+ Kf8 5.Rf7+ Ke8 6.Re7+ Kd8 7.Rd7+ Kc8 8.Rc7+ Kb8 9.Rb7+ Ka8 10.Ra7+ Kxa7

[Alayan]

Some moves are easier to find when you prune less. That's nothing new. But the engine that prunes less will be weaker in most positions.

[OliverBr]

Some moves are easier to find when you prune less. That's nothing new. But the engine that prunes less will be weaker in most positions.

This is true. My engine OliThink (http://brausch.org/home/chess) does hardly any pruning, so finds the stalemate very easily on ply 11. The other side is, that the general search depth is not that great.
Stockfish needs 29 plies.. Now we can gather why it is searching so deep, it misses a lot of moves, which doesn't affect strength a lot.

[Vinvin]

Some moves are easier to find when you prune less. That's nothing new. But the engine that prunes less will be weaker in most positions.

I think all engines should have a crazy-rook extension : when a king has no move (very rare case) and this side has only rook(s) (rare case) and this side is losing then extend all the possible checks (there are not so many, at most some hundreds) to see if it's possible to force a stalemate.
The algorithm can be more general (not only rooks check): when a king has no move (very rare case) and this side is losing then extend all the possible checks (there are not so many, at most some hundreds) to see if it's possible to force a stalemate.

References :
1) http://talkchess.com/forum3/viewtopic.p ... 09#p671509
White is winning : kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1

2) http://talkchess.com/forum3/viewtopic.p ... 18#p623318
White is winning : 1r4Q1/7p/2N1B2k/7P/3Pp1P1/K1N1P2R/PP2PR2/8 b - - 0 1

Some test positions where the theme is the stalemate :
1k6/3p4/1B6/4Pp1p/1p5R/1p4p1/pP3n2/K6n w - - bm Rxh1; id "Hard-Talkchess-2020.007" ;
4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - bm a8=B; id "Hard-Talkchess-2020.070" ;
7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - bm Qxg3+; id "Hard-Talkchess-2020.099" ;

[MikeB]

A similar thing happened once in a slow test game I ran between SF and Tornado 5, where SF took the Rook and allowed stalemate. It was about a year and a half ago, and SF also had trouble seeing the stalemate in analysis mode, but a newer SF may detect it faster, based on what I see in the other replies.

Regards,
CL

One day I was running a Spike 1.4 vs. Stockfish 6 with moderate time controls (40 moves in 20 minutes), and by move 67 Stockfish was clearly ahead (eval over +6 for black). Then, suddenly, and surprisingly, Spike, playing white, stalemated the game in just a few moves. Stockfish completely failed to see the stalemate and avoid it.

The crucial point in the game was this (white to play and stalemate):

[d]8/5R2/1p2p1pk/p6p/P2R3P/8/r5r1/7K w - - 0 68

It turns out that for some engines (including Stockfish), it's surprisingly hard to see the stalemate, while for other engines (such as Spike) it's very easy. When I analyze that position with several engines, using 4 threads on an i5, it takes on average about this much for them to see the stalemate (it can vary quite a lot between runs):

- Stockfish (even very recent versions): Between 2 and 8 minutes.
- Texel 1.02: Between 1 and 8 minutes.
- Gull 3: Doesn't seem to ever see the stalemate, no matter how long I let it run.
- Spike 1.4: Less than a second.
- Hakkapeliitta 3.0: 6 seconds (very consistently).
- Rybka 2.3.2a: Between 2 and 14 seconds.
- Bobcat 7.1: Doesn't seem to ever see the stalemate, no matter how long I let it run.
- Ruffian 1.0.5: Less than a second.
- Hermann 2.8: About one second.

I don't have Komodo, but I have been reported that it, too, can take several minutes to see the stalemate (although I don't know about the most recent versions).

What I find fascinating and interesting about this is that it's not an artificially constructed position, but it's an actual position that came up in an engine vs. engine game (and in which the stronger engine missed victory because it didn't see it).

I'm ok with 4 seconds here..

# Honey-X*r2.exe

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Honey XI-r2 by M. Byrne and scores of others...
s dpa true
Confirmation: Deep Pro Analysis set to true
s t 60
info string Hash Table: Windows Large Pages, 256 Mb
Confirmation: Threads set to 60
s h 8192
info string Hash Table: Windows Large Pages, 8192 Mb
Confirmation: Hash set to 8192 Mb
p f 8/5R2/1p2p1pk/p6p/P2R3P/8/r5r1/7K w - - 0 68
g mt 10
info depth 1 seldepth 1 multipv 1 score cp -248 nodes 10464 nps 3488000 tbhits 0 time 3 pv d4e4
info depth 2 seldepth 2 multipv 1 score cp -268 nodes 64387 nps 16096750 tbhits 0 time 4 pv d4e4 g2g4
info depth 3 seldepth 3 multipv 1 score cp -268 nodes 269520 nps 38502857 tbhits 0 time 7 pv d4e4 g2g4 e4g4
info depth 4 seldepth 6 multipv 1 score cp -268 nodes 373119 nps 46639875 tbhits 0 time 8 pv d4e4 g2h2 h1g1 a2g2 g1f1 g2c2
info depth 5 seldepth 7 multipv 1 score cp -228 nodes 432111 nps 48012333 tbhits 0 time 9 pv d4e4 g2h2 h1g1 a2g2 g1f1 g2c2
info depth 6 seldepth 7 multipv 1 score cp -257 nodes 524907 nps 52490700 tbhits 0 time 10 pv d4e4 g2c2 h1g1 e6e5 f7f6 c2c1 f6f1
info depth 7 seldepth 9 multipv 1 score cp -258 nodes 701347 nps 63758818 tbhits 0 time 11 pv d4e4 g2h2 h1g1 e6e5 f7f6 h2c2 e4e5 a2a1 f6f1
info depth 8 seldepth 11 multipv 1 score cp -288 nodes 1146231 nps 76415400 tbhits 0 time 15 pv d4e4 e6e5 f7c7 g2b2 c7c1 b2h2 h1g1 a2g2 g1f1 g2g4 e4g4
info depth 9 seldepth 16 multipv 1 score cp -344 nodes 1988274 nps 90376090 tbhits 0 time 22 pv f7f3 e6e5 d4e4 g2b2 f3g3 b2d2 g3g5 d2d1 g5g1 d1d4 e4d4 e5d4 g1d1 a2a4
info depth 10 seldepth 19 multipv 1 score cp -394 nodes 3093313 nps 99784290 tbhits 0 time 31 pv f7f3 e6e5 d4c4 g2b2 h1g1 a2a1 f3f1 b2b4 f1a1 b4c4 g1f1 c4h4 a1a3 h6g5 f1e2 h4g4 e2d2 h5h4
info depth 11 seldepth 21 multipv 1 score cp -402 nodes 4907957 nps 106694717 tbhits 0 time 46 pv f7f6 g2b2 h1g1 e6e5 d4c4 a2a1 f6f1 b2b4 f1a1 b4c4 a1a2 c4h4 a2b2 h4a4 b2b6 a4a1 g1f2 a5a4 b6a6 a4a3 f2f3
info depth 12 seldepth 21 multipv 1 score cp -424 nodes 6818434 nps 109974741 tbhits 0 time 62 pv f7f6 e6e5 d4c4 g2h2 h1g1 h2b2 f6f3 a2a1 f3f1 b2b4 f1a1 b4c4 a1a3 c4h4 g1f2 h6g5 a3g3 g5f5
info depth 13 seldepth 26 multipv 1 score cp -442 nodes 10505442 nps 114189586 tbhits 0 time 92 pv f7f8 g2b2 h1g1 e6e5 d4c4 a2a1 f8f1 b2b4 f1a1 b4c4 a1b1 c4b4 b1a1 b4g4 g1h2 g4h4 h2g2 h6g5 g2f3 h4f4 f3e3
info depth 14 seldepth 24 multipv 1 score cp -465 nodes 18829427 nps 116952962 tbhits 0 time 161 pv f7f3 e6e5 d4e4 g2b2 h1g1 a2a1 f3f1 b2b4 f1a1 b4e4 g1f2 e4h4 f2f3 h6g5 f3e3 h4b4 a1g1 g5h6 g1f1 b4a4 f1f6 a4b4 f6f2 a5a4
info depth 15 seldepth 27 multipv 1 score cp -493 nodes 24747253 nps 117844061 tbhits 0 time 210 pv f7f3 e6e5 d4c4 g2b2 f3g3 a2a1 g3g1 b2b4 g1a1 b4c4 a1a3 c4h4 h1g2 h6g5 g2g3 h4g4 g3h3 g4b4 h3g2 g5f5 a3f3 b4f4 f3b3 f4a4 b3b6
info depth 16 seldepth 30 multipv 1 score cp -505 nodes 25110275 nps 117888615 tbhits 0 time 213 pv f7f3 e6e5 d4c4 g2b2 h1g1 a2a1 f3f1 b2b4 f1a1 b4c4 a1b1 c4b4 b1a1 b4h4 a1a3 h6g5 a3a2 h4g4 g1h2 g5f5 h2h3
info depth 17 seldepth 32 multipv 1 score cp -505 nodes 25988048 nps 118127490 tbhits 0 time 220 pv f7f3 e6e5 d4e4 g2b2 f3g3 a2a1 g3g1 b2b4 g1a1 b4e4 h1h2 e4h4 h2g2 h6g5 a1a3 h4g4 g2h3 g5f5 a3b3 g4a4 b3b6 a4a3 h3g2 a3a2 g2h3 g6g5 b6b1 e5e4 b1f1 f5e5 h3g3 a5a4
info depth 18 seldepth 32 multipv 1 score cp -505 nodes 27157159 nps 118074604 tbhits 0 time 230 pv f7f3 e6e5 d4e4 g2b2 f3g3 a2a1 g3g1 b2b4 g1a1 b4e4 h1h2 e4h4 h2g2 h6g5 a1a3 h4g4 g2h3 g5f5 a3a2 g4f4 h3g2 g6g5 g2h2 h5h4 h2h3 e5e4 a2b2 e4e3
info depth 19 seldepth 38 multipv 1 score cp -518 nodes 31315185 nps 119523606 tbhits 0 time 262 pv f7f3 e6e5 d4c4 g2b2 h1g1 a2a1 f3f1 b2b4 f1a1 b4c4 g1f2 c4h4 f2g3 h6g5 a1a3 h4f4 g3g2 g5f5 a3b3 f4g4 g2h1 g4b4 b3f3 f5g5 f3g3 b4g4 g3e3 g4h4 h1g1 h4a4 e3e5 g5h6 e5e8 b6b5 e8h8 h6g5 g1g2
info depth 20 seldepth 40 multipv 1 score cp -536 nodes 35739307 nps 120334367 tbhits 0 time 297 pv f7f3 e6e5 d4c4 g2h2 h1g1 h2b2 f3f6 a2a1 f6f1 b2b4 f1a1 b4c4 a1a3 c4h4 a3b3 h4b4 b3a3 h6g5 a3a1 b4g4 g1h2 g4f4 a1a2 f4h4 h2g3 h4g4 g3h3 g5f5 a2f2 g4f4 f2b2 f4a4 b2b6 a4a3 h3h2
info depth 21 seldepth 42 multipv 1 score cp -551 nodes 42755317 nps 120099205 tbhits 0 time 356 pv f7f3 g2h2 h1g1 h2b2 d4c4 e6e5 f3f6 a2a1 f6f1 b2b4 f1a1 b4c4 a1a3 c4h4 g1f2 h4f4 f2g2 h6g5 a3b3 f4b4 b3a3 b4g4 g2h1 g5f5 a3f3 g4f4 f3b3 f4h4 h1g1 h4g4 g1f1 g4b4 b3a3 b4f4 f1e2 h5h4
info depth 22 seldepth 36 multipv 1 score cp -551 nodes 43715349 nps 120097112 tbhits 0 time 364 pv f7f3 g2h2 h1g1 h2b2 d4c4 e6e5 f3f6 a2a1 f6f1 b2b4 f1a1 b4c4 a1a3 c4h4 g1f2 h4f4 f2g2 h6g5 a3b3 f4b4 b3a3 b4g4 g2h1 g5f5 a3f3 g4f4 f3b3 f4h4 h1g1 h4g4 g1f1 g4b4 b3a3 b4f4 f1e2 h5h4
info depth 23 seldepth 37 multipv 1 score cp -551 nodes 43933574 nps 120365956 tbhits 0 time 365 pv f7f3 g2h2 h1g1 h2b2 d4c4 e6e5 f3f6 a2a1 f6f1 b2b4 f1a1 b4c4 a1a3 c4h4 g1f2 h4f4 f2g2 h6g5 a3b3 f4b4 b3a3 b4g4 g2h1 g5f5 a3f3 g4f4 f3b3 f4h4 h1g1 h4g4 g1f1 g4b4 b3a3 b4f4 f1e2 h5h4 a3b3
info depth 24 seldepth 44 multipv 1 score cp -551 nodes 46180617 nps 120262023 tbhits 0 time 384 pv f7f3 g2h2 h1g1 h2b2 d4c4 e6e5 f3f6 a2a1 f6f1 b2b4 f1a1 b4c4 a1a3 c4h4 g1f2 h4f4 f2g2 h6g5 a3b3 f4b4 b3a3 b4g4 g2h1 g5f5 a3f3 g4f4 f3b3 f4h4 h1g1 h4g4 g1f1 g4b4 b3a3 b4f4 f1g2 f4g4 g2h2 g4h4 h2g3 f5g5 a3b3 h4b4 b3e3
info depth 25 seldepth 46 multipv 1 score cp -581 nodes 68445843 nps 121143084 tbhits 0 time 565 pv f7f3 g2h2 h1g1 h2b2 d4c4 e6e5 f3f6 a2a1 f6f1 b2b4 f1a1 b4c4 g1f2 c4h4 f2g3 h6g5 a1a2 h4f4 a2b2 f4b4 b2a2 g5f5 g3h2 b4g4 h2h3 g6g5 a2a3 g4b4 a3a2 b4f4 h3g3 h5h4 g3h3 f4f3 h3h2 g5g4 a2b2 f3f4 b2b6 f4a4 b6b2 a4a3
info depth 26 seldepth 48 multipv 1 score cp -581 nodes 69607057 nps 121266649 tbhits 0 time 574 pv f7f3 g2h2 h1g1 h2b2 d4c4 e6e5 f3f6 a2a1 f6f1 b2b4 f1a1 b4c4 g1f2 c4h4 f2g3 h6g5 a1a2 h4f4 a2b2 f4b4 b2a2 g5f5 g3h2 g6g5 h2h3 h5h4 a2a3 b4g4 h3h2 g4f4 h2g1 f4b4 a3f3 f5g4 f3a3 g4f4 a3a2 f4f5 a2f2 b4f4
info depth 27 seldepth 51 multipv 1 score cp -600 nodes 101986088 nps 122139027 tbhits 0 time 835 pv f7f3 g2h2 h1g1 h2b2 d4c4 e6e5 f3f6 a2a1 f6f1 b2b4 f1a1 b4c4 g1f2 c4h4 f2f3 h4g4 a1a3 g4f4 f3g2 h6g5 a3a2 g5f5 g2h2 f4h4 h2g1 f5g5 a2b2 h4b4 b2a2 b4g4 g1h1 g4h4 h1g1 g5f5 a2a1 h4g4 g1h1 g6g5 a1a3 g4b4
info depth 28 seldepth 51 multipv 1 score cp -679 nodes 232835366 nps 123980493 hashfull 107 tbhits 0 time 1878 pv f7f3 g2h2 h1g1 h2b2 d4c4 e6e5 f3f6 a2a1 f6f1 b2b4 f1a1 b4c4 g1h1 c4h4 h1g2 h6g5 g2g3 h4g4 g3h3 g4f4 a1b1 f4h4 h3g2 h4b4 b1e1 b4g4 g2h2 g5f5 e1a1 g4f4 a1b1 f4h4 h2g1 h4g4 g1f2 g4b4 b1c1 b4a4 f2g2 a4b4 c1f1 b4f4 f1e1 f4g4 g2h2 g4b4 e1f1 b4f4 f1b1
info depth 29 seldepth 57 multipv 1 score cp -755 nodes 470070683 nps 126840443 hashfull 189 tbhits 0 time 3706 pv f7f3 e6e5 d4e4 g2h2 h1g1 h2b2 f3f6 a2a1 f6f1 b2b4 f1a1 b4e4 a1a3 e4h4 a3a1 h4g4 g1h2 g4b4 a1a2 h6g5 a2g2 g5f5 g2f2 b4f4 f2b2 f4h4 h2g1 h4b4 b2f2 f5g5 f2e2 b4a4 e2e5 g5h6 g1f1 a4b4 e5e8 a5a4 f1e2 h5h4 e2d3 b4b3 d3c2 h4h3 e8h8 h6g5 h8f8 b6b5
info depth 30 seldepth 49 multipv 1 score cp -0 nodes 544952250 nps 127533875 hashfull 215 tbhits 0 time 4273 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8d8
info depth 31 seldepth 19 multipv 1 score cp -0 nodes 544983423 nps 127511329 hashfull 215 tbhits 0 time 4274 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8b8 c7b7 b8c8
info depth 32 seldepth 9 multipv 1 score cp -0 nodes 544997176 nps 127514547 hashfull 215 tbhits 0 time 4274 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8g8
info depth 33 seldepth 9 multipv 1 score cp 0 nodes 545011129 nps 127517812 hashfull 215 tbhits 0 time 4274 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8f7
info depth 34 seldepth 17 multipv 1 score cp 0 nodes 545036110 nps 127523656 hashfull 215 tbhits 0 time 4274 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8b8 c7b7 b8b7
info depth 35 seldepth 11 multipv 1 score cp 0 nodes 545054758 nps 127528020 hashfull 215 tbhits 0 time 4274 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8e7
info depth 36 seldepth 12 multipv 1 score cp -0 nodes 545127371 nps 127515174 hashfull 216 tbhits 0 time 4275 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8f8
info depth 37 seldepth 17 multipv 1 score cp 0 nodes 545188502 nps 127529474 hashfull 216 tbhits 0 time 4275 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8b8 c7b7 b8b7
info depth 38 seldepth 16 multipv 1 score cp -0 nodes 545239382 nps 127511548 hashfull 216 tbhits 0 time 4276 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8d8
info depth 39 seldepth 15 multipv 1 score cp -0 nodes 546803841 nps 127519552 hashfull 217 tbhits 0 time 4288 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8d8
info depth 40 seldepth 12 multipv 1 score cp -0 nodes 548281200 nps 127507255 hashfull 218 tbhits 0 time 4300 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8f8
info depth 41 seldepth 18 multipv 1 score cp -0 nodes 552212320 nps 127502267 hashfull 220 tbhits 0 time 4331 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8b8 c7b7 b8c8
info depth 42 seldepth 13 multipv 1 score cp -0 nodes 558530785 nps 127489336 hashfull 224 tbhits 0 time 4381 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8g8
info depth 43 seldepth 12 multipv 1 score cp -0 nodes 561366711 nps 127467463 hashfull 224 tbhits 0 time 4404 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8g8
info depth 44 seldepth 15 multipv 1 score cp -0 nodes 563073081 nps 127478623 hashfull 225 tbhits 0 time 4417 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8g8
info depth 45 seldepth 15 multipv 1 score cp 0 nodes 573670222 nps 127453948 hashfull 229 tbhits 0 time 4501 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8c7
info depth 46 seldepth 9 multipv 1 score cp -0 nodes 584750359 nps 127507710 hashfull 235 tbhits 0 time 4586 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8g8
info depth 47 seldepth 19 multipv 1 score cp -0 nodes 590541157 nps 127464096 hashfull 237 tbhits 0 time 4633 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8b8 c7c8 b8a7 c8c7
info depth 48 seldepth 13 multipv 1 score cp 0 nodes 599166882 nps 127482315 hashfull 242 tbhits 0 time 4700 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8d7
info depth 49 seldepth 11 multipv 1 score cp -0 nodes 614267668 nps 127520794 hashfull 248 tbhits 0 time 4817 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8f8
info depth 50 seldepth 11 multipv 1 score cp -0 nodes 624425387 nps 127563919 hashfull 253 tbhits 0 time 4895 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8f8
info depth 51 seldepth 15 multipv 1 score cp -0 nodes 651732050 nps 127590456 hashfull 269 tbhits 0 time 5108 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8d8
info depth 52 seldepth 11 multipv 1 score cp 0 nodes 691054388 nps 127712878 hashfull 289 tbhits 0 time 5411 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8e7
info depth 53 seldepth 11 multipv 1 score cp 0 nodes 726769363 nps 127929829 hashfull 302 tbhits 0 time 5681 pv f7h7 h6h7 d4d7 h7h8 d7h7 h8g8 h7g7 g8f8 g7f7 f8f7
info depth 54 seldepth 13 multipv 1 score cp -0 nodes 730093961 nps 127929553 hashfull 303 tbhits 0 time 5707 pv f7h7 h6h7 d4d7 h7h8 d7h7 h8g8 h7g7 g8f8 g7f7 f8e8 f7e7 e8f8
info depth 55 seldepth 12 multipv 1 score cp -0 nodes 773455080 nps 127991904 hashfull 320 tbhits 0 time 6043 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8f8
info depth 56 seldepth 11 multipv 1 score cp -0 nodes 801386599 nps 128057941 hashfull 335 tbhits 0 time 6258 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8f8
info depth 57 seldepth 13 multipv 1 score cp -0 nodes 841268179 nps 128261652 hashfull 354 tbhits 0 time 6559 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8f8
info depth 58 seldepth 20 multipv 1 score cp -0 nodes 938333315 nps 128715132 hashfull 397 tbhits 0 time 7290 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8b8 c7c8 b8a7 c8c7 a7a8 c7c8
info depth 59 seldepth 11 multipv 1 score cp 0 nodes 970466078 nps 128674897 hashfull 411 tbhits 0 time 7542 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8e7
info depth 60 seldepth 18 multipv 1 score cp -0 nodes 1288949542 nps 128882065 hashfull 537 tbhits 0 time 10001 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8d8
bestmove f7h7 ponder h6h7

[Vinvin]

I'm ok with 4 seconds here..

# Honey-X*r2.exe
...

I tested with one thread (2 Mn/sec) to emulate the speed of a phone, it took 2m9s.

Code: Select all

FEN: 8/5R2/1p2p1pk/p6p/P2R3P/8/r5r1/7K w - - 0 1

Honey-XI-r2:
...
 32/59	01:54	 228 871 919	1 995 674	-8,15	1.Rc4 Rgb2 2.Kg1 e5 3.Re4 Ra1+ 4.Rf1 Rb4 5.Rxa1 Rxe4 6.Kf2 Rxh4 7.Kg3 Kg5 8.Kf3 Rf4+ 9.Kg2 Rg4+ 10.Kh2 Kf5 11.Rb1 Rxa4 12.Rxb6 Ra2+ 13.Kh3 Ra3+ 14.Kg2 a4 15.Rc6 h4 16.Rc2 e4 17.Rf2+ Rf3 18.Rb2 a3 19.Rb8 g5 20.Ra8 Rb3 21.Rf8+ Kg4 22.Rf1 Rb2+ 23.Kg1 a2
 32/51	02:00	 240 442 361	2 003 619	-8,34	1.Rc4 Rgb2
 33/56	02:09	 261 244 887	2 010 890	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kf8
 34/33	02:09	 261 260 541	2 010 872	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kxe7
 35/19	02:10	 262 330 672	2 009 904	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kd8 6.Rd7+ Kc8 7.Rc7+ Kb8 8.Rc8+ Kb7 9.Rc7+ Kb8
 36/24	02:10	 262 551 840	2 010 197	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kd8 6.Rd7+ Kc8 7.Rc7+ Kb8 8.Rc8+ Kb7 9.Rc7+ Ka8 10.Ra7+ Kb8 11.Rb7+ Ka8

[MikeB]

I'm ok with 4 seconds here..

# Honey-X*r2.exe
...

I tested with one thread (2 Mn/sec) to emulate the speed of a phone, it took 2m9s.

Code: Select all

FEN: 8/5R2/1p2p1pk/p6p/P2R3P/8/r5r1/7K w - - 0 1

Honey-XI-r2:
...
 32/59	01:54	 228 871 919	1 995 674	-8,15	1.Rc4 Rgb2 2.Kg1 e5 3.Re4 Ra1+ 4.Rf1 Rb4 5.Rxa1 Rxe4 6.Kf2 Rxh4 7.Kg3 Kg5 8.Kf3 Rf4+ 9.Kg2 Rg4+ 10.Kh2 Kf5 11.Rb1 Rxa4 12.Rxb6 Ra2+ 13.Kh3 Ra3+ 14.Kg2 a4 15.Rc6 h4 16.Rc2 e4 17.Rf2+ Rf3 18.Rb2 a3 19.Rb8 g5 20.Ra8 Rb3 21.Rf8+ Kg4 22.Rf1 Rb2+ 23.Kg1 a2
 32/51	02:00	 240 442 361	2 003 619	-8,34	1.Rc4 Rgb2
 33/56	02:09	 261 244 887	2 010 890	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kf8
 34/33	02:09	 261 260 541	2 010 872	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kxe7
 35/19	02:10	 262 330 672	2 009 904	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kd8 6.Rd7+ Kc8 7.Rc7+ Kb8 8.Rc8+ Kb7 9.Rc7+ Kb8
 36/24	02:10	 262 551 840	2 010 197	 0,00	1.Rh7+ Kxh7 2.Rd7+ Kg8 3.Rg7+ Kf8 4.Rf7+ Ke8 5.Re7+ Kd8 6.Rd7+ Kc8 7.Rc7+ Kb8 8.Rc8+ Kb7 9.Rc7+ Ka8 10.Ra7+ Kb8 11.Rb7+ Ka8

Here BF is much better with one thread:

Code: Select all

# B*h-X*-r2*
Bluefish XI-r2  by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
s dpa true
Confirmation: Deep Pro Analysis set to true
s z c:/syzygy
info string Found 510 tablebases
Confirmation: SyzygyPath set to c:/syzygy
p f 8/5R2/1p2p1pk/p6p/P2R3P/8/r5r1/7K w - - 0 68
g mt 120
...
info 20 seconds
info depth 28 seldepth 55 multipv 1 score cp -589 nodes 60052311 nps 3002315 hashfull 868 tbhits 117809 time 20002 pv f7f6 g2b2 h1g1 e6e5 d4c4 b2g2 g1f1 g2h2 f1g1 h2b2 f6f3 a2a1 f3f1 b2b4 f1a1 b4c4 g1f2 c4h4 f2g3 h6g5 a1b1 h4b4 b1e1 b4g4 g3h3 e5e4 e1e2 g5f4 e2f2 f4e5 f2e2 g6g5 h3h2 g4f4 h2g2 h5h4 e2b2 g5g4 b2b6 e4e3 b6b5 e5e4 b5c5 e3e2 c5c4 e4e3 c4c3 e3d4 c3c1 f4e4
info depth 29 seldepth 54 multipv 1 score cp -590 nodes 64924154 nps 3002134 hashfull 893 tbhits 128808 time 21626 pv f7f6 g2b2 h1g1 e6e5 d4c4 b2g2 g1f1 g2h2 f1g1 h2b2 f6f3 a2a1 f3f1 b2b4 f1a1 b4c4 g1f2 c4h4 f2g3 h6g5 a1b1 h4b4 b1e1 b4g4 g3f3 g5f5 e1b1 g4b4 b1e1 b4a4 f3g2 a4g4 g2f1 h5h4 e1e2 g4a4 f1g1 e5e4 e2f2 f5g4 f2e2 g4f4 e2b2 e4e3
info depth 30 seldepth 53 multipv 1 score cp 0 nodes 75076821 nps 3005958 hashfull 927 tbhits 151020 time 24976 pv f7h7 h6h7 d4d7 h7h8 d7h7 h8g8 h7g7 g8f8 g7f7 f8f7
info depth 31 seldepth 19 multipv 1 score cp -0 nodes 75263230 nps 3006320 hashfull 928 tbhits 151994 time 25035 pv f7h7 h6h7 d4d7 h7h8 d7h7 h8g8 h7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8e8

and here using 60 cylinders - 1.2 seconds

Code: Select all

# B*h-X*-r2*
Bluefish XI-r2  by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
s t 60
info string Hash Table: Windows Large Pages, 256 Mb
Confirmation: Threads set to 60
s h 16384
info string Hash Table: Windows Large Pages, 16384 Mb
Confirmation: Hash set to 16384 Mb
s z c:/syzygy
info string Found 510 tablebases
Confirmation: SyzygyPath set to c:/syzygy
s dpa true
Confirmation: Deep Pro Analysis set to true
p f 8/5R2/1p2p1pk/p6p/P2R3P/8/r5r1/7K w - - 0 68
g mt 10
info depth 1 seldepth 1 multipv 1 score cp -238 nodes 179105 nps 25586428 tbhits 0 time 7 pv f7f6
info depth 2 seldepth 3 multipv 1 score cp -223 nodes 240294 nps 30036750 tbhits 0 time 8 pv d4d6 g2h2 h1g1 h2h4
info depth 3 seldepth 4 multipv 1 score cp -254 nodes 321913 nps 40239125 tbhits 0 time 8 pv d4d8 g2h2 h1g1 h2h4
info depth 4 seldepth 6 multipv 1 score cp -260 nodes 378027 nps 42003000 tbhits 0 time 9 pv d4e4 g2h2 h1g1 a2g2 g1f1 g2c2
info depth 5 seldepth 7 multipv 1 score cp -205 nodes 408248 nps 45360888 tbhits 0 time 9 pv d4e4 g2h2 h1g1 a2g2 g1f1 g2d2
info depth 6 seldepth 9 multipv 1 score cp -160 nodes 461531 nps 46153100 tbhits 1 time 10 pv d4e4 g2h2 h1g1 a2g2 g1f1 g2c2
info depth 7 seldepth 11 multipv 1 score cp -220 nodes 626257 nps 56932454 tbhits 7 time 11 pv d4e4 g2h2 h1g1 a2g2 g1f1 g2d2 f1g1 d2a2
info depth 8 seldepth 12 multipv 1 score cp -237 nodes 957236 nps 68374000 tbhits 49 time 14 pv d4e4 g2h2 h1g1 h2d2 e4e6 a2a1 f7f1 a1a4 e6b6 a4g4 g1h1
info depth 9 seldepth 15 multipv 1 score cp -245 nodes 2189991 nps 87599640 tbhits 275 time 25 pv d4e4 g2c2 h1g1 e6e5 f7f6 h6g7 f6f3 c2g2 g1f1 g2h2
info depth 10 seldepth 21 multipv 1 score cp -328 nodes 3378217 nps 96520485 tbhits 630 time 35 pv f7f6 g2e2 h1g1 e6e5 d4d1 a2a4 f6b6 a4g4 g1f1 e2a2 b6e6 g4h4 f1g1 a2b2 d1e1 h4g4 g1f1
info depth 11 seldepth 19 multipv 1 score cp -359 nodes 5425477 nps 104336096 tbhits 1711 time 52 pv f7f6 e6e5 d4e4 g2d2 h1g1 d2d1 f6f1 d1d4 e4d4 e5d4 f1d1 a2a4 g1f2 d4d3 f2e3 a4h4 e3d3 b6b5
info depth 12 seldepth 24 multipv 1 score cp -265 nodes 8915892 nps 108730390 tbhits 3914 time 82 pv d4e4 g2h2 h1g1 h2d2 e4e6 a2a1 f7f1 a1a4 e6b6 a4g4 g1h1 g4h4 h1g1
info depth 13 seldepth 35 multipv 1 score cp -372 nodes 14628889 nps 112529915 tbhits 7545 time 130 pv f7f6 e6e5 d4d6 g2g4 d6b6 g4h4 h1g1 h4g4 g1h1 a2a1 h1h2 a1a4 f6f2 g4h4 h2g1 a4g4 f2g2 a5a4 b6a6 g4g2 g1g2 h6g5 a6a7 h4f4 g2g3 f4d4
info depth 14 seldepth 23 multipv 1 score cp -306 nodes 21285911 nps 115058978 tbhits 12286 time 185 pv d4c4 g2d2 h1g1 e6e5 c4e4 d2d1 f7f1 d1d4 e4d4 e5d4 f1f8 d4d3 f8h8 h6g7 h8d8 a2a4
info depth 15 seldepth 35 multipv 1 score cp -431 nodes 39135586 nps 117524282 tbhits 30930 time 333 pv f7f8 e6e5 f8h8 h6g7 d4d8 g2h2 h1g1 h2h4 h8g8 g7h6 d8d6 h4g4 g1f1 a2a4 d6b6 a4f4 f1e1 a5a4 g8h8 h6g7 h8a8 g4g1 e1d2 h5h4 b6b7 g7f6 d2d3 g1g2
info depth 16 seldepth 35 multipv 1 score cp -447 nodes 40790552 nps 117552023 tbhits 33165 time 347 pv f7f8 e6e5 f8h8 h6g7 d4d8 g2h2 h1g1 h2h4 h8g8 g7h6 d8d6 h4g4 g1h1 a2a4 d6b6 a4a1 h1h2 a1a2 h2h1 e5e4 g8a8 a5a4 b6b1 a4a3 b1e1 g4h4 h1g1
info depth 17 seldepth 39 multipv 1 score cp -436 nodes 43228061 nps 117787632 tbhits 37413 time 367 pv f7f8 e6e5 d4e4 g2d2 h1g1 d2d1 f8f1 d1d4 f1e1 a2a4 e4e5 d4h4 e5e8 a4g4 g1f2 h4h2 f2f3 a5a4 e1e6 b6b5 e8h8 h6g5 e6e5 g5h4 e5b5 a4a3 h8a8 a3a2
info depth 18 seldepth 40 multipv 1 score cp -474 nodes 52691215 nps 118141737 tbhits 50764 time 446 pv f7f8 e6e5 d4e4 g2d2 h1g1 d2d1 f8f1 d1d4 f1e1 a2a4 e4e5 d4h4 g1f2 a4f4 f2e3 a5a4 e3d2 f4b4 e1e3 h4c4 d2d3 a4a3 e3e2 c4c1 e2a2 b4b3 d3e4
info depth 19 seldepth 41 multipv 1 score cp -495 nodes 68311716 nps 119009958 tbhits 73354 time 574 pv f7f8 e6e5 d4d8 g2h2 h1g1 h2h4 d8e8 h4a4 f8h8 h6g5 e8e5 g5h4 h8f8 a2b2 f8f2 a4g4 g1f1 b2f2 f1f2 a5a4 e5e1 b6b5 f2e3 b5b4 e3d3 h4g5 e1a1 a4a3
info depth 20 seldepth 45 multipv 1 score cp -501 nodes 72722773 nps 119217660 tbhits 78393 time 610 pv f7f8 e6e5 f8h8 h6g7 d4d8 g2h2 h1g1 h2h4 h8g8 g7h6 d8d6 h4g4 g1h1 a2a3 h1h2 a3a4 d6b6 a4a2 h2h3 a5a4 b6c6 a2a3 h3h2 e5e4 c6c5 g4h4 h2g2 a3a2 g2g1 h4g4 g1h1 a4a3 g8h8 h6g7 h8a8 g4f4
info depth 21 seldepth 38 multipv 1 score cp -525 nodes 99601606 nps 119857528 tbhits 117226 time 831 pv f7f8 e6e5 f8h8 h6g7 d4d8 g2h2 h1g1 h2h4 h8g8 g7h6 d8d6 h4g4 g1h1 a2a4 d6b6 a4a1 h1h2 a1a2 h2h3 a5a4 b6d6 a2a3 h3h2 e5e4 d6d2 h6g5 d2b2 a3b3 b2b3 a4b3 g8b8 e4e3 b8b5 g5f4 b5b3 e3e2
info depth 22 seldepth 50 multipv 1 score cp -0 nodes 150696163 nps 120943951 hashfull 33 tbhits 194636 time 1246 pv f7h7 h6h7 d4d7 h7g8 d7g7 g8f8 g7f7 f8e8 f7e7 e8d8 e7d7 d8c8 d7c7 c8b8 c7c8 b8a7 c8c7

[Paloma]

Code: Select all

s z c:/syzygy
info string Found 510 tablebases
Confirmation: SyzygyPath set to c:/syzygy

but there are 511 files, or i'm wrong?

[Vinvin]

Code: Select all

s z c:/syzygy
info string Found 510 tablebases
Confirmation: SyzygyPath set to c:/syzygy

but there are 511 files, or i'm wrong?

Yes, I added one 7-piece : KRPPKRP