Test Position

zullil · Post by **zullil** » Thu Aug 02, 2018 2:48 pm

[d]7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - 1 2

From a study by Neghina; see this thread.

Vinvin · Post by **Vinvin** » Thu Aug 02, 2018 4:12 pm

I overlooked this one. Thanks to point it out !
Forced draw after : ...Qxg3+! 3. fxg3 Rc2+
I will test deeper this evening.

zullil · Post by **zullil** » Fri Aug 03, 2018 12:33 am

zullil wrote: ↑Thu Aug 02, 2018 2:48 pm [d]7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - 1 2

From a study by Neghina; see this thread.

Cfish-dev gets it:

Code: Select all

info depth 48 seldepth 69 multipv 1 score cp -448 nodes 15026133907 nps 55774017 hashfull 713 tbhits 67585392 time 269411 pv d3g3 f2g3
 c3c2 h2h3 c2h2 h3g4 h2h4 g4g5 h4g4 g5f6 g4f4 f6e5 f4e4 e5d5 e4d4 d5c6 d4d6 c6b5 d6b6 b5c5 b6c6 c5d5 c6c5 d5e4 c5c4 e4d3 c4c3 d3d2 c3d3
  d2c2 d3d2 c2c3 d2c2 c3b4 c2c4 b4a3 c4a4 a3b3 a4b4 b3c3 b4c4 c3d2 c4c2 d2e3 c2e2 e3d4 e2e4 d4d5 e4e5 d5c4 e5e4 c4b5 e4b4 b5c6 b4c4 c6d6
   c4c6 d6e5 c6e6 e5f5 e6e5 f5g4 e5g5 g4f4 g5f5 f4e4 f5e5 e4f3
info depth 49 currmove d3g3 currmovenumber 1
info depth 49 seldepth 44 multipv 1 score cp -441 lowerbound nodes 15058230438 nps 55778247 hashfull 713 tbhits 67682489 time 269966 pv d3g3
info depth 49 currmove d3g3 currmovenumber 1
info depth 49 seldepth 44 multipv 1 score cp -433 lowerbound nodes 15150100468 nps 55773331 hashfull 715 tbhits 68111198 time 271637 pv d3g3
info depth 49 currmove d3g3 currmovenumber 1
info depth 49 seldepth 44 multipv 1 score cp -422 lowerbound nodes 15169401997 nps 55771090 hashfull 716 tbhits 68223075 time 271994 pv d3g3
info depth 49 currmove d3g3 currmovenumber 1
info depth 49 seldepth 44 multipv 1 score cp -406 lowerbound nodes 15253683966 nps 55756252 hashfull 719 tbhits 68786797 time 273578 pv d3g3
info depth 49 currmove d3g3 currmovenumber 1
info depth 49 seldepth 76 multipv 1 score cp -385 lowerbound nodes 15332741159 nps 55758058 hashfull 720 tbhits 69084328 time 274987 pv d3g3
info depth 49 currmove d3g3 currmovenumber 1
info depth 49 seldepth 76 multipv 1 score cp -355 lowerbound nodes 15416538202 nps 55758435 hashfull 723 tbhits 69480734 time 276488 pv d3g3
info depth 49 currmove d3g3 currmovenumber 1
info depth 49 seldepth 76 multipv 1 score cp -317 lowerbound nodes 15625357383 nps 55759244 hashfull 727 tbhits 70644625 time 280229 pv d3g3
info depth 49 currmove d3g3 currmovenumber 1
info depth 49 seldepth 76 multipv 1 score cp -267 lowerbound nodes 15916716023 nps 55804070 hashfull 739 tbhits 72241875 time 285225 pv d3g3
info depth 49 currmove d3g3 currmovenumber 1
info depth 49 seldepth 86 multipv 1 score cp -202 lowerbound nodes 16067598996 nps 55805000 hashfull 747 tbhits 73234692 time 287924 pv d3g3
info depth 49 currmove d3g3 currmovenumber 1
info depth 49 currmove d3e4 currmovenumber 2
info depth 49 currmove d3e2 currmovenumber 3
info depth 49 currmove d3e3 currmovenumber 4
info depth 49 currmove c3b3 currmovenumber 5
info depth 49 currmove d3d5 currmovenumber 6
info depth 49 currmove c3c2 currmovenumber 7
info depth 49 currmove c3c1 currmovenumber 8
info depth 49 currmove d3d1 currmovenumber 9
info depth 49 currmove d3d2 currmovenumber 10
info depth 49 currmove d3d4 currmovenumber 11
info depth 49 currmove d3g6 currmovenumber 12
info depth 49 currmove d3d6 currmovenumber 13
info depth 49 currmove d3c2 currmovenumber 14
info depth 49 currmove d3f3 currmovenumber 15
info depth 49 currmove c3a3 currmovenumber 16
info depth 49 currmove d3f5 currmovenumber 17
info depth 49 currmove d3f1 currmovenumber 18
info depth 49 currmove d3d7 currmovenumber 19
info depth 49 currmove d3d8 currmovenumber 20
info depth 49 currmove d3b1 currmovenumber 21
info depth 49 currmove c3c4 currmovenumber 22
info depth 49 currmove d3c4 currmovenumber 23
info depth 49 seldepth 86 multipv 1 score cp -192 nodes 16104495864 nps 55793047 hashfull 749 tbhits 73448881 time 288647 pv d3g3 f2g3 c3c2
 h2h3 c2h2 h3g4 h2h4 g4g5 h4g4 g5f6 g4f4 f6e5 f4e4 e5d6 e4e6 d6c5 e6c6 c5b4 c6c4 b4a3 c4a4 a3b3 a4b4 b3c3 b4c4 c3d2 c4d4 d2e1 d4e4 e1f1
  e4f4 f1g1 f4f1 g1g2 f1f2 g2h3 f2h2 h3g4 h2h4 g4f3 h4f4 f3e3 f4e4 e3d3 e4e3 d3c4 e3c3 c4d5 c3c5 d5e4 c5c4 e4e5 c4e4 e5d5 e4e5 d5d4 e5e4 d4c5
   e4c4 c5d6 c4c6 d6e5 c6e6 e5f5 e6e5 f5g4 e5e4 g4h3 e4h4 h3g2 h4h2 g2f3 h2f2 f3e4

[ . . . ]

Code: Select all

info depth 57 seldepth 76 multipv 1 score cp 0 nodes 17422412892 nps 55797073 hashfull 773 tbhits 81999878 time 312246 pv d3g3 f2g3 c3c2
 h2h3 c2h2 h3g4 h2h4 g4f5 h4f4 f5e5 f4e4 e5d6 e4e6 d6c5 e6c6 c5b4 c6c4 b4a3 c4a4 a3b3 a4b4 b3c3 b4c4 c3d3 c4c3 d3e4 c3c4

MikeB · Post by **MikeB** » Fri Aug 03, 2018 2:46 am

zullil wrote: ↑Thu Aug 02, 2018 2:48 pm [d]7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - 1 2

From a study by Neghina; see this thread.

latest released McBrain 9.6, very nice position! - as an fyi, I alway set contempt to zero ( it is saved setting setting under xBoard) when using McBrain for any analysis, your mileage may vary if you use the default setting or different setting.

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 57	+0.08 	7.89G	4:34.33	Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kf5 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kd6 Rd7+ Kxc5 Rc7+ Kd6 Rc6+ Ke5 Re6+ Kf4 Rf6+ Kg5 Rf5+ Kg4 Rf4+ Kh5 Rf5+ Kg4 
 56	+0.08 	7.43G	4:18.74	Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kf5 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kd6 Rd7+ Kxc5 Rc7+ Kd6 Rc6+ Ke5 Re6+ Kf4 Rf6+ Kg5 Rf5+ Kh4 Rxf7 c5 Rc7 b4 Rb7 Kg5 Rxb4 g4 Rc4 Ne6 Kg8 Kf5 Kf7 Ng5+ Kg8 Ne4 Rc2 Kf6 Rc4 Kf5 
 55	+0.08 	7.24G	4:12.12	Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kf5 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kd6 Rd7+ Kxc5 Rc7+ Kd6 Rc6+ Ke5 Re6+ Kf4 Rf6+ Kg5 Rf5+ Kh4 Rxf7 c5 Rc7 b4 Rb7 Kg5 Rxb4 Kf5 Rc4 Ne6 Kg8 g4 Kf7 Ng5+ Kg8 Ne4 Rc2 Kf6 Rc4 Kf5 
 54	+0.08 	6.90G	3:59.86	Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kf5 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kd6 Rd7+ Kxc5 Rc7+ Kd6 Rc6+ Ke5 Re6+ Kf4 Rf6+ Kg5 Rf5+ Kh4 Rxf7 c5 Rc7 b4 Rb7 Kg5 Rxb4 Kf5 Rc4 Ne6 Kg8 g4 Kf7 Ng5+ Kg8 Ne4 Rc2 Kf6 Rc4 Kf5 
 53	+0.08 	6.89G	3:59.47	Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kf5 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kd6 Rd7+ Kxc5 Rc7+ Kd6 Rc6+ Ke5 Re6+ Kf4 Rf6+ Kg5 Rf5+ Kh4 Rxf7 c5 Rc7 b4 Rb7 Kg5 Rxb4 Kf5 Rc4 Ne6 Kg8 g4 Kf7 Ng5+ Kg8 Ne4 Rc2 Kf6 Rc4 Kf5 
 52	+0.08 	6.88G	3:59.36	Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kf5 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kd6 Rd7+ Kxc5 Rc7+ Kd6 Rc6+ Ke5 Re6+ Kf4 Rf6+ Kg5 Rf5+ Kh4 Rxf7 c5 Rc7 b4 Rb7 Kg5 Rxb4 Kf5 Rc4 Ne6 Kg8 g4 Kf7 Ng5+ Kg8 Ne4 Rc2 Kf6 Rc4 Kf5 
 51	+0.08 	6.88G	3:59.32	Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kf5 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kd6 Rd7+ Kxc5 Rc7+ Kd6 Rc6+ Ke5 Re6+ Kf4 Rf6+ Kg5 Rf5+ Kh4 Rxf7 c5 Rc7 b4 Rb7 Kg5 Rxb4 Kf5 Rc4 Ne6 Kg8 g4 Kf7 Ng5+ Kg8 Ne4 Rc2 Kf6 Rc4 Kf5 
 50	+0.08 	6.88G	3:59.27	Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kf5 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kd6 Rd7+ Kxc5 Rc7+ Kd6 Rc6+ Ke5 Re6+ Kf4 Rf6+ Kg5 Rf5+ Kh4 Rf4+ Kh3 Rxf7 c5 Rb7 Kg4 Rxb2 Ne6 Rc2 Kf5 Rf2+ Ke5 Rg2 Kf4 Rc2 g4 Re2 Nd4 Rf2+ K 
 49	+0.08 	6.51G	3:46.26	Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kf5 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kd6 Rd7+ Kxc5 Rc7+ Kd6 Rc6+ Ke5 Re6+ Kf4 Rf6+ Kg5 Rf5+ Kh4 Rxf7 Kg5 Rc7 b3 Rb7 c5 Rxb3 g4 Rc3 Ne6 Kg8 Kf6 Rf3+ Ke5 Re3+ Kf5 Rc3 Kf6 
 48	+0.08 	6.45G	3:44.32	Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kf5 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kd6 Rd7+ Kxc5 Rc7+ Kb4 Rxc4+ Ka5 Rc5+ Kb6 Rb5+ Kc6 Rb6+ Kc5 Rc6+ Kd4 Rc4+ Kd5 Rc5+ Ke6 Rc6+ Ke5 Re6+ Kd4 Re4+ Kc5 Rc4+ Kd6 Rc6+ Ke5 
 47	+0.08!	6.34G	3:40.83	Qxg3+! 
 47	+0.15!	6.31G	3:39.90	Qxg3+! 
 47	+0.23!	6.24G	3:37.44	Qxg3+! 
 47	+0.30!	6.21G	3:36.53	Qxg3+! 
 47	+0.38!	6.17G	3:35.27	Qxg3+! 
 47	+0.45!	6.13G	3:34.12	Qxg3+! 
 47	+0.53!	6.07G	3:31.98	Qxg3+! 
 47	+0.60!	6.02G	3:30.53	Qxg3+! 
 47	+0.68!	6.00G	3:29.76	Qxg3+! 
 47	+0.75!	5.97G	3:28.68	Qxg3+! 
 47	+0.83!	5.95G	3:28.03	Qxg3+! 
 47	+0.90!	5.93G	3:27.45	Qxg3+! 
 47	+0.98!	5.91G	3:26.81	Qxg3+! 
 47	+1.05!	5.89G	3:26.29	Qxg3+! 
 47	+1.13!	5.88G	3:25.77	Qxg3+! 
 47	+1.20!	5.85G	3:24.94	Qxg3+! 
 47	+1.28!	5.85G	3:24.77	Qxg3+! 
 47	+1.35!	5.81G	3:23.43	Qxg3+! 
 47	+1.43!	5.80G	3:23.08	Qxg3+! 
 47	+1.50!	5.79G	3:22.83	Qxg3+! 
 47	+1.62!	5.79G	3:22.83	Qxg3+! 
 47	+2.52!	5.79G	3:22.83	Qxg3+! 
 46	+5.19 	4.07G	2:23.47	Qd7 e8=Q+ Qxe8 Nxe8 Rxc4 Kxh3 Rc2 f4 Rxb2 Kg4 Rb4 Nd6 Rd4 Nb5 Rb4 Nc3 Rc4 Ne2 Ra4 Kf5 Ra3 g4 Re3 Bc4 Re5+ Kf6 Re4 Bd3 Re3 Bb5 Re4 Kf5 Rb4 Bd3 Rb3 Ke4 c4 Bc2 Rh3 g5 Kg8 Nd4 Rg3 Ke5 Kh8 Kd5 Rg4 Ke4 Rg1 Ke3 Rg3+ Kf2 Rh3 Bf5 Ra3 Be4

lech · Post by **lech** » Fri Aug 03, 2018 10:24 am

I think this position is not too interesting and the two solutions are possible only thanks to the "rule 50", and it it is not a good way.

Let's go to the source position:

[d]4N2k/4PB1p/7P/B1p5/2P5/3q2Pp/1P3P1K/2r5 w - - best move Bc3+ and next Rxc3 Nc7 and win;

In my project Sting I missed the difficult question of perpeptual stalemates. Now I have two good examples and I tried to get it.
next Sting 1024M Hash; 1 threads; time 28 sec.

Code: Select all

info depth 29 multipv 1 score cp 246 nodes 15882981 nps 725150 time 21903 pv a5c3 c1c3 e8g7 d3g3 f2g3 c3c2 h2h3 c2h2 h3g4 h2h4 g4g5 h4g4 g5f6 g4f4 f6e6 f4f6 e6e5 f6e6 e5d5 e6d6 d5c5 d6c6 c5d5 c6c5 d5d6 c5d5 d6c7 d5c5 c7b7 c5c7 b7b6 c7c6 b6a5 c6c5
info depth 30
info currmove a5c3 currmovenumber 1
info depth 30 multipv 1 score cp 254 lowerbound nodes 21205147 nps 743596 time 28517 pv a5c3
info currmove a5c3 currmovenumber 1
info depth 30 multipv 1 score cp 262 lowerbound nodes 26212521 nps 756537 time 34648 pv a5c3
info currmove a5c3 currmovenumber 1
info depth 30 multipv 1 score cp 274 lowerbound nodes 33011278 nps 767811 time 42994 pv a5c3 c1c3 e8c7 d3g3 f2g3 c3c2 h2h3 c2h2 h3g4 h2h4 g4g5 h4g4 g5f6 g4f4 f6e6 f4e4 e6d5 e4e7 f7e8 e7c7 e8c6 c7c8 d5c5 c8g8 b2b4 g8g5 c5d4 g5g8 c6e4 g8d8 d4c3 d8g8 b4b5 g8g3 c3d2 g3b3 e4f5 b3b4 f5d3
info currmove a5c3 currmovenumber 1
info depth 30 multipv 1 score cp 292 lowerbound nodes 72147259 nps 784533 time 91962 pv a5c3 c1c3 e8c7 d3g3 f2g3 c3c2 h2h3 c2h2 h3g4 h2h4 g4g5 h4g4 g5f6 g4f4 f6e6 f4e4 e6d5 e4e7 f7e8 e7c7 e8c6 c7c8 d5c5 c8g8 b2b4 g8g5 c5d4 g5g8 c6e4 g8d8 d4c3 d8g8 b4b5 g8g3 c3d2 g3b3 e4d3 h8g8 c4c5 g8f8 c5c6
info currmove a5c3 currmovenumber 1
info currmove h2h3 currmovenumber 2
info currmove e8d6 currmovenumber 3
info currmove f2f4 currmovenumber 4
info currmove f7h5 currmovenumber 5
info currmove f7d5 currmovenumber 6
info currmove e8f6 currmovenumber 7
info currmove e8g7 currmovenumber 8
info currmove f7g6 currmovenumber 9
info currmove f7e6 currmovenumber 10
info currmove e8c7 currmovenumber 11
info currmove a5d2 currmovenumber 12
info currmove b2b4 currmovenumber 13
info currmove g3g4 currmovenumber 14
info currmove b2b3 currmovenumber 15
info currmove f2f3 currmovenumber 16
info currmove f7g8 currmovenumber 17
info currmove a5e1 currmovenumber 18
info currmove a5b6 currmovenumber 19
info currmove a5b4 currmovenumber 20
info currmove a5c7 currmovenumber 21
info currmove a5d8 currmovenumber 22
info depth 30 multipv 1 score cp 319 nodes 89658837 nps 788389 time 113724 pv a5c3 c1c3 e8c7 d3d7 e7e8q d7e8 f7e8 c3c4 h2h3 c4e4 e8h5 e4b4 c7d5 b4b2 h3g2 b2a2 d5c3 a2a3 c3e4 c5c4 g2f1 a3a6 f1e2 a6h6 h5f7 h6c6 f7d5 c6c7 e4c3 h8g7 e2e3 g7f6 e3d4 c7d7 d4c4 f6e5

The second good example of perpetual stalemates is: (next Sting solves it quickly too) 1k6/3p4/1B6/4Pp1p/1p5R/1p4p1/pP3n2/K6n w - - bm Rxh1;

zullil · Post by **zullil** » Fri Aug 03, 2018 1:05 pm

lech wrote: ↑Fri Aug 03, 2018 10:24 am I think this position is not too interesting and the two solutions are possible only thanks to the "rule 50", and it it is not a good way.

Let's go to the source position:

[d]4N2k/4PB1p/7P/B1p5/2P5/3q2Pp/1P3P1K/2r5 w - - best move Bc3+ and next Rxc3 Nc7 and win;

In my project Sting I missed the difficult question of perpeptual stalemates. Now I have two good examples and I tried to get it.
next Sting 1024M Hash; 1 threads; time 28 sec.

Code: Select all

info depth 29 multipv 1 score cp 246 nodes 15882981 nps 725150 time 21903 pv a5c3 c1c3 e8g7 d3g3 f2g3 c3c2 h2h3 c2h2 h3g4 h2h4 g4g5 h4g4 g5f6 g4f4 f6e6 f4f6 e6e5 f6e6 e5d5 e6d6 d5c5 d6c6 c5d5 c6c5 d5d6 c5d5 d6c7 d5c5 c7b7 c5c7 b7b6 c7c6 b6a5 c6c5
info depth 30
info currmove a5c3 currmovenumber 1
info depth 30 multipv 1 score cp 254 lowerbound nodes 21205147 nps 743596 time 28517 pv a5c3
info currmove a5c3 currmovenumber 1
info depth 30 multipv 1 score cp 262 lowerbound nodes 26212521 nps 756537 time 34648 pv a5c3
info currmove a5c3 currmovenumber 1
info depth 30 multipv 1 score cp 274 lowerbound nodes 33011278 nps 767811 time 42994 pv a5c3 c1c3 e8c7 d3g3 f2g3 c3c2 h2h3 c2h2 h3g4 h2h4 g4g5 h4g4 g5f6 g4f4 f6e6 f4e4 e6d5 e4e7 f7e8 e7c7 e8c6 c7c8 d5c5 c8g8 b2b4 g8g5 c5d4 g5g8 c6e4 g8d8 d4c3 d8g8 b4b5 g8g3 c3d2 g3b3 e4f5 b3b4 f5d3
info currmove a5c3 currmovenumber 1
info depth 30 multipv 1 score cp 292 lowerbound nodes 72147259 nps 784533 time 91962 pv a5c3 c1c3 e8c7 d3g3 f2g3 c3c2 h2h3 c2h2 h3g4 h2h4 g4g5 h4g4 g5f6 g4f4 f6e6 f4e4 e6d5 e4e7 f7e8 e7c7 e8c6 c7c8 d5c5 c8g8 b2b4 g8g5 c5d4 g5g8 c6e4 g8d8 d4c3 d8g8 b4b5 g8g3 c3d2 g3b3 e4d3 h8g8 c4c5 g8f8 c5c6
info currmove a5c3 currmovenumber 1
info currmove h2h3 currmovenumber 2
info currmove e8d6 currmovenumber 3
info currmove f2f4 currmovenumber 4
info currmove f7h5 currmovenumber 5
info currmove f7d5 currmovenumber 6
info currmove e8f6 currmovenumber 7
info currmove e8g7 currmovenumber 8
info currmove f7g6 currmovenumber 9
info currmove f7e6 currmovenumber 10
info currmove e8c7 currmovenumber 11
info currmove a5d2 currmovenumber 12
info currmove b2b4 currmovenumber 13
info currmove g3g4 currmovenumber 14
info currmove b2b3 currmovenumber 15
info currmove f2f3 currmovenumber 16
info currmove f7g8 currmovenumber 17
info currmove a5e1 currmovenumber 18
info currmove a5b6 currmovenumber 19
info currmove a5b4 currmovenumber 20
info currmove a5c7 currmovenumber 21
info currmove a5d8 currmovenumber 22
info depth 30 multipv 1 score cp 319 nodes 89658837 nps 788389 time 113724 pv a5c3 c1c3 e8c7 d3d7 e7e8q d7e8 f7e8 c3c4 h2h3 c4e4 e8h5 e4b4 c7d5 b4b2 h3g2 b2a2 d5c3 a2a3 c3e4 c5c4 g2f1 a3a6 f1e2 a6h6 h5f7 h6c6 f7d5 c6c7 e4c3 h8g7 e2e3 g7f6 e3d4 c7d7 d4c4 f6e5

The second good example of perpetual stalemates is: (next Sting solves it quickly too) 1k6/3p4/1B6/4Pp1p/1p5R/1p4p1/pP3n2/K6n w - - bm Rxh1;

But it is not clear from this search that Sting has really "solved" the problem. Stockfish cannot distinguish between Nc7 and Ng7 until very high depth. That's why I posted the position after Ng7 as a test.

What is Sting's output on my test position? When does it find Qxg3+? When does it give a score of 0?

Thanks for the second position. Cfish eventually finds Rxh1---but with a score of -11.8.

fishpov · Post by **fishpov** » Mon Aug 06, 2018 5:01 pm

[D]1k6/3p4/1B6/4Pp1p/1p5R/1p4p1/pP3n2/K6n w - - 0 1
1.Rxh1 Nxh1 2.e6 !
As stalemate position, I think this is not yet solved by Sting.
Thanks.

zullil · Post by **zullil** » Mon Aug 06, 2018 9:00 pm

fishpov wrote: ↑Mon Aug 06, 2018 5:01 pm [d]1k6/3p4/1B6/4Pp1p/1p5R/1p4p1/pP3n2/K6n w - - 0 1
1.Rxh1 Nxh1 2.e6 !
As stalemate position, I think this is not yet solved by Sting.
Thanks.

hgm · Post by **hgm** » Mon Aug 06, 2018 9:06 pm

Note that the FEN side-to-move indicators are now white and black.

You might have to refresh the browser cache to see it.

zullil · Post by **zullil** » Mon Aug 06, 2018 10:06 pm

hgm wrote: ↑Mon Aug 06, 2018 9:06 pm Note that the FEN side-to-move indicators are now white and black. You might have to refresh the browser cache to see it.

Noted! Thanks. Not sure about other users, but this helps me quite a bit.

Test Position

Test Position

Re: Test Position

Re: Test Position

Re: Test Position

Re: Test Position

Re: Test Position

Re: Test Position

Re: Test Position

Re: Test Position

Re: Test Position