ThrowBack Tuesday - Nolot 11

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MikeB
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ThrowBack Tuesday - Nolot 11

Post by MikeB »

Pierre Nolot created the Nolot Test Suite, 11 test positions that were quite difficult for chess computers and programs to solve in 1994. In fact, they were once described as "11 tactical positions computers can't solve" by Marc-François Baudot, co-author of Virtual Kasparov for Game Boy Advance and Play Station. So let's take at some of the comments made back then as well as some made more recently with some analysis by dev- SF-McBrain 5.0

Source for fens and comments: https://en.wikipedia.org/wiki/Nolot

Source for Bruce Moreland (BM) comments:
https://web.archive.org/web/20070607172 ... /index.htm

For those who do not know Bruce:
https://chessprogramming.wikispaces.com/Bruce+Moreland
Well known in his day for the chess program Ferret, which won several computer championships in the 90's.


Nolot #1
[d]r3qb1k/1b4p1/p2pr2p/3n4/Pnp1N1N1/6RP/1B3PP1/1B1QR1K1 w - - 0 1
The best Novag computer back in the day, the Diablo 68000, found 26. Nxh6 after seven and a half months.
BM: "This one seems to work, but I don't think that anyone has ever gotten a big score."

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 34	+2.61 	1.37G	1:06.76	Nxh6 Rxh6 Nxd6 Qh5 Rg5 Qxd1 Nf7+ Kg8 Nxh6+ Kh8 Rxd1 c3 Nf7+ Kg8 Bg6 Nf4 Bxc3 Nbd5 Ne5 Be7 Rf5 Nxc3 Rd7 Be4 Rxf4 Ne2+ Kh2 Nxf4 Bxe4 Re8 g3 Bg5 Nf3 Bf6 Nd2 Ne6 Bd5 Kf8 Ne4 Ba1 Bc4 Re7 Rd6 Nd4 Ng5 a5 Rd5 Bc3 Bd3 Re1 Bg6 Ne6 Ne4 Bb4 
 33	+2.50 	1.32G	1:04.57	Nxh6 Rxh6 Nxd6 Qh5 Rg5 Qxd1 Nf7+ Kg8 Nxh6+ Kh8 Rxd1 c3 Nf7+ Kg8 Bg6 Nf4 Bxc3 Nbd5 Ne5 Be7 Rf5 Nxc3 Rd7 Be4 Rxf4 Ne2+ Kh2 Nxf4 Bxe4 Re8 g3 Bg5 Nf3 Bf6 Bb7 Ng6 Bxa6 Ne5 Nxe5 Rxe5 Kg2 Rc5 Bb5 Bc3 Bd3 Kf8 h4 Ke8 Rb7 Kd8 Bb5 Rc7 Rb8+ 
 32	+2.47 	705.3M	0:33.92	Nxh6 Rxh6 Nxd6 Qh5 Rg5 Qxd1 Nf7+ Kg8 Nxh6+ Kh8 Rxd1 c3 Nf7+ Kg8 Bg6 Nf4 Bxc3 Nbd5 Ne5 Be7 Rf5 Nxc3 Rd7 Be4 Rxf4 Ne2+ Kh2 Nxf4 Bxe4 Re8 g3 Bg5 Nf3 Bf6 Bb7 Ng6 Bxa6 Ne5 Nxe5 Rxe5 Kg2 Rc5 Bb5 Kf8 h4 Bc3 Bd3 Ke8 Rb7 Kd8 Bb5 Rc7 Rb8 
 32	+2.46?	658.7M	0:31.68	Nxh6 Rxh6? 
 31	+2.54 	519.9M	0:25.06	Nxh6 Rxh6 Nxd6 Qh5 Rg5 Qxd1 Nf7+ Kg8 Nxh6+ Kh8 Rxd1 c3 Nf7+ Kg8 Bg6 Nf4 Bxc3 Nbd5 Ne5 Be7 Rf5 Nxc3 Rd7 Be4 Rxf4 Ne2+ Kh2 Nxf4 Bxe4 Re8 g3 Bg5 Nf3 Bf6 Bb7 Ng6 Bxa6 Ne5 Nxe5 Rxe5 Kg2 Rc5 Bb5 Kf8 h4 Be7 Rb7 Bd8 Bd3 Bf6 Bg6 Ra5 Bc2 
 30	+2.53!	472.3M	0:22.75	Nxh6! 
 29	+2.27 	298.2M	0:14.44	Nxh6 Rxh6 Nxd6 Qh5 Rg5 Qxd1 Nf7+ Kg8 Nxh6+ Kh8 Rxd1 c3 Nf7+ Kg8 Bg6 Nf4 Bxc3 Nbd5 Rb1 Bc6 Bd2 Nxg6 Rxg6 Ne7 Nh6+ Kh8 Rxc6 Nxc6 Rb6 Ne7 Ng4 Nd5 Rc6 a5 Ne3 Nxe3 Bxe3 Rd8 Kf1 Kg8 Ke2 Rd7 Ra6 Bb4 Kf3 Kf7 g4 Bc3 g5 
 28	+2.32 	233.6M	0:11.30	Nxh6 Rxh6 Nxd6 Qh5 Rg5 Qxd1 Nf7+ Kg8 Nxh6+ Kh8 Rxd1 c3 Nf7+ Kg8 Bg6 Nf4 Bxc3 Nbd5 Rb1 Bc6 Bd2 Nxg6 Rxg6 Ne7 Nh6+ Kh7 Re6 gxh6 Bxh6 Bd5 Bxf8 Bxe6 Bxe7 Re8 Bc5 Kg8 a5 Bc4 Rb6 Re1+ Kh2 Re5 Rc6 Bb5 Rc8+ Kf7 Rc7+ Kg6 f4 Re2 
 27	+2.21 	167.0M	0:08.12	Nxh6 Rxh6 Nxd6 Qh5 Rg5 Qxd1 Nf7+ Kg8 Nxh6+ Kh8 Rxd1 c3 Nf7+ Kg8 Bg6 Nf4 Bxc3 Nbd5 Rb1 Bc6 Bd2 Nxg6 Rxg6 Ne7 Rxc6 Nxc6 Ng5 Rb8 Rc1 Ne7 Rc4 Rb2 Nf3 Ra2 g4 Ra3 Kg2 Nd5 Rd4 Nf6 Ne5 Be7 Nc6 Kf7 
 26	+2.13 	118.8M	0:05.79	Nxh6 Rxh6 Nxd6 Qh5 Rg5 Qxd1 Nf7+ Kg8 Nxh6+ Kh8 Rxd1 c3 Nf7+ Kg8 Bg6 Nf4 Bxc3 Nbd5 Rb1 Bc6 Bd2 Nxg6 Rxg6 Ne7 Rxc6 Nxc6 Rb6 Kxf7 Rxc6 Rd8 Be3 Rd1+ Kh2 a5 Rc7+ Kg6 Ra7 Bb4 Kg3 Bc3 Kf3 Ra1 
 25	+2.12 	111.9M	0:05.46	Nxh6 Rxh6 Nxd6 Qh5 Rg5 Qxd1 Nf7+ Kg8 Nxh6+ Kh8 Rxd1 c3 Nf7+ Kg8 Bg6 Nf4 Bxc3 Nbd5 Rb1 Bc6 Ba1 Nxg6 Rxg6 Ne7 Nh6+ Kh7 Rxc6 Nxc6 Nf5 Rb8 Rc1 Ne7 Be5 Rc8 Rxc8 Nxc8 a5 Kg6 g4 Kf7 Kg2 Ne7 Nxe7 Bxe7 Kf3 
 25	+2.19?	91.9M  	0:04.50	Nxh6 Rxh6? 
 24	+2.26!	86.6M  	0:04.25	Nxh6! 
 24	+2.06!	71.9M  	0:03.53	Nxh6! 
 24	+1.86!	61.1M  	0:03.00	Nxh6! 
 23	+1.66!	49.1M  	0:02.41	Nxh6! 
 22	+1.48 	40.7M  	0:02.00	Nxh6 Rxh6 Nxd6 Qh5 Qxh5 Rxh5 Nxb7 Nf4 Re4 Nbd3 Bc3 Rb8 Bxd3 Nxd3 Rxc4 Nc1 Rf3 Ne2+ Kh2 Kg8 Bb4 Bxb4 Rxb4 Rd5 Re3 Rd2 Rbe4 Rxb7 Rxe2 Rbb2 Rxd2 Rxd2 Kg3 Ra2 Rg4 Kf7 
 21	+1.50 	30.8M  	0:01.51	Nxh6 Rxh6 Nxd6 Qh5 Qxh5 Rxh5 Nxb7 Nf4 Re4 Nbd3 Bxd3 Nxd3 Bc3 Rb8 Rxc4 Nc1 Rf3 Ne2+ Kh2 Nxc3 Rcxc3 Kg8 Rc7 Rd5 Rff7 Rd2 Kg3 Ra2 a5 Re8 Rcd7 Ree2 Rf3 
 20	+1.27!	21.7M  	0:01.07	Nxh6! 
 19	+1.23 	17.6M  	0:00.87	Nxh6 Rxh6 Nxd6 Qh5 Be5 Nd3 Bxd3 cxd3 Nxb7 Qxd1 Rxd1 Nb4 Rg4 Rc8 Bf4 Rhc6 Bd2 Rc4 Bxb4 Bxb4 Rxc4 Rxc4 Rxd3 Kg8 Kh2 Rc2 Kg3 
 18	+0.83!	7.28M  	0:00.37	Nxh6! 
 17	+0.50!	4.62M  	0:00.24	Nxh6! 
 16	+0.24!	2.75M  	0:00.15	Nxh6! 
 15	+0.15!	2.05M  	0:00.11	Nxh6! 
 14	  0.00 	1.04M  	0:00.06	Nxh6 c3 Ba1 Rxh6 Nxc3 Qf7 Qd4 Qf6 Qd1 Qf7 
 13	  0.00 	665227	0:00.04	Nxh6 c3 Ba1 Rxh6 Nxc3 Qf7 Qd4 Qf6 Qd1 Qf7 
 12	  0.00!	559076	0:00.03	Nxh6! 
 11	 -0.29!	296209	0:00.02	Nxh6! 
 10	 -0.44!	221162	0:00.01	Nxh6! 
  9	 -0.15 	82362  	0:00.01	Qd4 Rc8 Nxh6 c3 Nf5 Re5 Nh4 cxb2 Ng6+ Kg8 Qxb2 a5 
  8	 -0.43!	39986  	0:00.00	Ne3! 
  7	 -0.75 	21079  	0:00.00	Qd4 c3 Rxc3 Nxc3 Qxb4 Bxe4 Qxc3 Bxb1 
  6	 -0.51 	17040  	0:00.00	Qd4 c3 Rxc3 Nxc3 Qxb4 Bxe4 Bxc3 Bxb1 
  5	 -0.62 	14736  	0:00.00	Qd4 c3 Rxc3 Nxc3 Bxc3 d5 
  4	 -0.52 	11066  	0:00.00	Qd4 c3 Bxc3 Nxc3 Rxc3 Qxa4 
  3	 -0.29 	4159    	0:00.00	Qc1 h5 Qxc4 
  2	 -0.05 	3105    	0:00.00	Qc1 h5 
  1	 -0.19 	1044    	0:00.00	Rf3 
  0	#
Nolot #2
[d]r4rk1/pp1n1p1p/1nqP2p1/2b1P1B1/4NQ2/1B3P2/PP2K2P/2R5 w - - 0 1
Deep Junior 8.ZX found it around 1 minute.
Stockfish 8 64bit 3CPU running on 2016 hardware found Rxc5!! in 3 seconds.
BM: "This one is correct, but whether or not you find it could be a matter of luck. You might start out with a negative score, but you should get a score of +3 or so if you search long enough."

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 32	+6.55 	1.12G	0:46.76	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Rb8 f4 Ne6 Ke3 a6 b4 h5 f5 gxf5 Qxf5 Rc8 Qe4 Rc1 Qg2+ Kf8 Qxb7 Re1+ Kd2 Rxe5 Qa8+ Kg7 d7 Rg5 d8=Q Nxd8 Qxd8 Rg6 Kc3 Rc6+ Kb3 Rg6 Qd5 Kf8 Qxh5 Ke7 Qd5 
 31	+6.21 	694.9M	0:29.59	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Rb8 f4 Ne6 Ke3 a5 Qa4 Ra8 Qd7 Rb8 Qb5 b6 Qd7 Kg7 Qa7 Rc8 Qxb6 Rc5 Ke4 Rc2 Qxa5 Re2+ Kd3 Nxf4+ Kc3 Re3+ Kc2 Re2+ Kb1 Rf2 d7 Ne6 d8=R Nxd8 Qxd8 
 30	+6.15 	544.5M	0:23.20	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Re8 f4 Rb8 Ke3 Ne6 b4 Kg7 Qd5 a6 Qc4 h5 Qe4 Kg8 f5 gxf5 Qxf5 Rc8 Qe4 b6 Qg2+ Kf8 Qb7 Rc1 Qxa6 h4 Kd2 Rb1 Qa2 Rg1 Qa8+ Kg7 d7 b5 d8=Q Nxd8 Qxd8 Rg2+ Ke3 Rxh2 
 29	+6.09 	442.0M	0:18.99	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Rb8 f4 Ne6 Ke3 Kf8 b4 Kg7 Qd5 h6 Qc4 h5 Qe4 Kg8 Qc2 Re8 Qg2 Nd8 Qe4 a6 Qd5 Kg7 Ke4 Rh8 d7 Ne6 f5 gxf5+ Kxf5 Rd8 Qd6 b6 Qe7 
 28	+5.98 	326.6M	0:14.20	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Rb8 Ke3 Ne6 f4 Nc5 Qc4 Ne6 b4 Kf8 Ke4 Kg7 f5 gxf5+ Kxf5 Rg8 Ke4 Rd8 Kd5 b5 Qh4 Kg8 Qf6 h5 Qe7 Rc8 d7 Rc2 d8=Q+ Nxd8 Qxd8+ Kg7 Qf6+ Kf8 e6 
 27	+5.56 	208.4M	0:09.20	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Rb8 f4 Ne6 Ke3 h5 b4 Ng7 Qc4 Ne6 Ke4 Re8 f5 gxf5+ Kxf5 Ng7+ Ke4 Ne6 Ke3 Rb8 Qh4 Rc8 d7 Rd8 Qe7 b6 Ke4 a5 Kd5 axb4 Kc6 
 26	+5.51 	145.1M	0:06.48	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Rb8 Ke3 Ne6 f4 b6 Qc6 Kg7 Qd7 a5 Qa7 Rc8 Qxb6 Rc5 Ke4 Rc2 Qxa5 Re2+ Kd3 Nxf4+ Kc3 Re3+ Kc2 Re2+ Kb1 Ne6 d7 h5 d8=Q Nxd8 Qxd8 Rxe5 Qd4 Kf6 Kc2 Kf5 Kd3 
 26	+5.35!	124.7M	0:05.58	Rxc5! 
 26	+5.05?	90.4M  	0:04.05	Rxc5 Qxc5? 
 25	+5.12 	83.7M  	0:03.76	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Rb8 Ke3 Ne6 f4 Kg7 b4 b6 Qg2 Kf8 Qc6 a5 b5 Kg7 Qd7 Nc5 Qe7 Rb7 Qf6+ Kg8 f5 gxf5 Qg5+ Kh8 Qxf5 Ne6 Ke4 Kg8 Kd5 Kg7 Qf6+ Kg8 
 24	+4.92 	67.9M  	0:03.06	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nbd7 Bxf8 Rxf8 Bd5 Nb6 Qd4 Rc8 f4 Nxd5 Qxd5 b6 Qc4 a5 Ke3 Kg7 Qb5 Ne6 Qxb6 Rc5 d7 Rd5 Qc6 Rd1 Qc8 Rd5 Qe8 Rd1 Qe7 Kg8 Ke4 
 23	+4.87 	39.4M  	0:01.80	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Rb8 Ke3 Ne6 f4 Nc5 Qd5 Ne6 b4 Kf8 Qb5 a6 Qd7 b5 Qe7+ Kg8 
 22	+4.80 	37.8M  	0:01.73	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Rb8 Ke3 Ne6 f4 a5 Qd5 b6 Qb5 Nc5 b4 axb4 Qxb4 Ne6 Qb5 h5 b4 h4 Qc6 h3 Qd5 Rc8 
 21	+4.72 	31.9M  	0:01.46	Rxc5 Qxc5 Nxc5 Nxc5 Bh6 Nxb3 axb3 Nd7 Bxf8 Nxf8 Qe4 Rb8 Ke3 Ne6 f4 a5 Qd5 b6 Qd3 b5 f5 gxf5 Qxf5 h6 
 20	+2.18!	13.8M  	0:00.65	Rxc5! 
 19	+1.35!	11.8M  	0:00.56	Rxc5! 
 18	  0.00 	8.74M  	0:00.42	Bf6 Qb5+ Ke1 Nxf6 Nxf6+ Kg7 Nh5+ gxh5 Qf6+ Kg8 Qg5+ Kh8 Qf6+ Kg8 
 17	  0.00 	7.28M  	0:00.35	Bf6 Qb5+ Ke1 Nxf6 Nxf6+ Kg7 Nh5+ gxh5 Qf6+ Kg8 Qg5+ Kh8 Qf6+ Kg8 
 16	 -0.47!	4.66M  	0:00.23	Bf6! 
 15	 -0.92!	3.30M  	0:00.16	Bf6! 
 14	 -1.05!	2.05M  	0:00.10	Bf6! 
 13	 -2.72!	695176	0:00.04	Bf6! 
 12	 -2.98!	577872	0:00.03	Bf6! 
 11	 -3.14!	481897	0:00.03	Bf6! 
 10	 -3.01 	147595	0:00.01	Kf1 Qb5+ Kg2 Bd4 Qd2 Bxe5 Rc7 Rac8 Rxb7 Nc5 Nxc5 Qxc5 
  9	 -2.48 	62967  	0:00.00	Kf1 Qb5+ Kg2 Bd4 Qd2 Bxe5 Bh6 Rae8 Bxf8 Rxf8 
  8	 -1.75!	46040  	0:00.00	Kf1! 
  7	 -3.31 	27876  	0:00.00	Kf1 Nd5 Bxd5 Qxd5 Nxc5 Nxc5 Kg2 Nd7 
  6	 -3.40 	24676  	0:00.00	Kf1 Nd5 Bxd5 Qxd5 Bh6 Qd3+ Kg2 
  5	 -3.17 	22034  	0:00.00	Kf1 Nd5 Bxd5 Qxd5 Bh6 
  4	 -3.02 	18375  	0:00.00	Bh6 Nd5 Bxd5 Qxd5 
  3	 -3.10 	8524    	0:00.00	Rd1 Qb5+ Rd3 a5 
  2	 -1.50 	3742    	0:00.00	a4 Nxa4 
  1	 -0.77 	1746    	0:00.00	Kd1 
  0	#
Nolot#3
[d]r2qk2r/ppp1b1pp/2n1p3/3pP1n1/3P2b1/2PB1NN1/PP4PP/R1BQK2R w KQkq - 0 1
Stockfish 8 64bit 3CPU running on 2016 hardware found Nxg5!! in 55 seconds.
BM: "I don't think that anyone has ever solved this one."

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 27	+1.70?	301.0M	0:15.55	Nxg5 Bxd1? 
 27	+1.98!	271.4M	0:14.04	Nxg5! 
 26	+1.77 	183.2M	0:09.60	Nxg5 Bxd1 Nxe6 Qc8 Nxg7+ Kf7 Bh6 Bg4 O-O+ Kg8 Rf4 Nxe5 dxe5 Bc5+ Kh1 Be3 Rxg4 Qxg4 N3f5 Bg5 Ne6 Qxf5 Bxf5 Bxh6 Nxc7 Rf8 Rf1 Bd2 Rf3 h5 Rg3+ Kf7 Nxd5 Ke8 Nf6+ Kf7 Rd3 Rd8 Nd5 Bh6 
 26	+1.74?	177.5M	0:09.31	Nxg5 Bxd1? 
 26	+1.81?	172.7M	0:09.06	Nxg5 Bxd1? 
 25	+1.89!	168.2M	0:08.82	Nxg5! 
 24	+1.69!	95.2M  	0:05.02	Nxg5! 
 23	+1.50!	69.2M  	0:03.68	Nxg5! 
 22	+1.08!	43.8M  	0:02.37	Nxg5! 
 21	+0.90!	30.5M  	0:01.68	Nxg5! 
 20	+0.97 	13.4M  	0:00.77	h3 Bxf3 gxf3 Nf7 Be3 Bh4 Rg1 Rf8 Qe2 Qe7 O-O-O O-O-O Kb1 Kb8 Nh5 g6 Nf4 Bg5 Rg4 Bxf4 Bxf4 a6 h4 Rd7 Rdg1 Rdd8 Be3 
 19	+0.94 	9.88M  	0:00.56	h3 Bxf3 gxf3 Nf7 Be3 g6 Qc2 Bh4 Rg1 Bxg3+ Rxg3 Qh4 Qg2 O-O-O O-O-O Ne7 Rg4 Qh5 Rg1 Nf5 Bf2 
 18	+0.94 	6.71M  	0:00.39	h3 Bxf3 gxf3 g6 Be3 Nf7 Qc2 Bh4 Rg1 Bxg3+ Rxg3 Qh4 Qh2 O-O-O O-O-O Ne7 Rg4 Qh5 h4 Nf5 
 17	+0.86!	2.92M  	0:00.18	h3! 
 16	+0.75 	2.12M  	0:00.13	h3 Bxf3 gxf3 Nf7 Be3 Bh4 Rg1 g6 Qe2 O-O f4 Nh6 O-O-O Bxg3 Rxg3 Nf5 Rgg1 Nxe3 Qxe3 a6 
 15	+0.79 	1.49M  	0:00.09	h3 Bxf3 gxf3 Nf7 f4 Bh4 Rg1 Qe7 Be3 g6 Qc2 O-O-O O-O-O Nh6 Qb3 Bxg3 Rxg3 Rhf8 
 14	+0.84 	827500	0:00.05	h3 Bxf3 gxf3 Nf7 f4 Qd7 Be3 O-O-O Qc2 Na5 Bf2 Bh4 Qe2 Kb8 O-O-O a6 Kb1 
 13	+0.98 	733152	0:00.05	h3 Bxf3 gxf3 Nf7 f4 Qd7 Be3 O-O-O Qc2 g6 O-O-O Kb8 Kb1 a6 Rhg1 
 12	+1.04!	550050	0:00.04	h3! 
 11	+0.91 	246941	0:00.02	h3 Bxf3 gxf3 Nf7 f4 g6 Be3 Bh4 Rg1 Ne7 Qf3 Bxg3+ Rxg3 Nf5 Bxf5 gxf5 
 10	+1.02!	97518  	0:00.01	h3! 
  9	+1.13 	64186  	0:00.01	h3 Bxf3 gxf3 Nf7 f4 g6 Be3 Bh4 Qg4 
  8	+1.22!	38601  	0:00.00	h3! 
  7	+0.76!	32388  	0:00.00	h3! 
  6	+0.74 	25220  	0:00.00	h3 Nxf3+ gxf3 Bh4 hxg4 Bxg3+ Ke2 a6 
  5	+0.86!	19408  	0:00.00	Bd2! 
  4	+1.42 	7310    	0:00.00	Be3 Bxf3 gxf3 a6 
  3	+1.27 	5986    	0:00.00	Be3 Bxf3 gxf3 
  2	+1.04 	3917    	0:00.00	O-O Bxf3 
  1	+1.11 	1156    	0:00.00	Bb5 
  0	#
Notlot#4
[d]r1b1kb1r/1p1n1ppp/p2ppn2/6BB/2qNP3/2N5/PPP2PPP/R2Q1RK1 w kq - 0 1
Stockfish 8 64bit 3CPU running on 2016 hardware found Nxe6!! in 0.5 seconds.
BM:"This one also seems to work, but I don't know that anyone has gotten a big score."

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 27	+2.45 	274.1M	0:14.36	Nxe6 h6 Bxf6 Nxf6 Nxf8 Nxh5 Qxd6 Qc6 Qe5+ Kxf8 Qxh5 Be6 Rad1 Re8 Qa5 Kg8 Rd4 Kh7 Rfd1 Rc8 Rd6 Qc7 Qxc7 Rxc7 f3 g5 Rd8 Rxd8 Rxd8 h5 a4 Kg7 Kf2 f5 Rd6 Kf7 
 27	+2.46?	268.6M	0:14.06	Nxe6 h6? 
 26	+2.53 	78.6M  	0:04.06	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxe4 Bxd7 Be7 Bxc8 Kxc8 Nb6+ Kb8 Re1 Qc6 Nxa8 Bd8 Qf3 Kxa8 Qxc6 bxc6 Kf2 d5 Kf3 Kb7 c4 h6 Bh4 dxc4 Rac1 g5 Bf2 g4+ Kg3 h5 Bd4 h4+ Kf2 g3+ hxg3 hxg3+ Kf3 
 25	+2.47 	55.6M  	0:02.85	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxe4 Bxd7 Be7 Bxc8 Kxc8 Nb6+ Kb8 Nxa8 Qc6 Re1 Bd8 Qf3 Kxa8 Qxc6 bxc6 Kf2 d5 Kf3 Kb7 c4 h5 cxd5 Nxd5 Bxd8 Rxd8 Rac1 Kc7 f5 
 24	+2.51 	53.0M  	0:02.72	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxe4 Bxd7 Be7 Bxc8 Kxc8 Nb6+ Kb8 Nxa8 Qc6 Re1 Bd8 Qf3 Kxa8 Qxc6 bxc6 Bxf6 Bxf6 Rad1 d5 b3 Kb7 g4 h6 Kg2 Kc7 Kg3 Kd6 h4 Bc3 Re2 Bf6 
 23	+2.37 	41.8M  	0:02.15	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxe4 Bxd7 Be7 Bxc8 Kxc8 Nb6+ Kb8 Nxa8 Qc6 Re1 Bd8 Qf3 d5 Rad1 Kxa8 Bxf6 Bxf6 Rxd5 Qxc2 b3 Qc6 Rd3 Qxf3 gxf3 Rc8 Rd7 Rc2 Re8+ Ka7 
 22	+2.23 	24.3M  	0:01.27	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxe4 Bxd7 Bxd7 Nxf6 Qc4 Nd5+ f6 Bh4 Rc8 c3 Bb5 Re1 Qd3 Qh5 Rc5 Rad1 Rxd5 Qxd5 Qxd5 Rxd5 Bc4 Ra5 Kd7 b3 Bf7 Bf2 d5 f5 Bd6 
 21	+2.12 	20.5M  	0:01.07	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxe4 Bxd7 Bxd7 Nxf6 Qc4 Nd5+ f6 Bh4 Rc8 c3 Bg4 Qxg4 Qxd5 Bf2 Qc6 Rfe1 Kc7 Rac1 h5 Qe6 d5 
 20	+2.47 	15.6M  	0:00.82	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxe4 Bxd7 Bxd7 Nxf6 Qc4 Nd5+ f6 Bh4 Rc8 c3 Bc6 Nb6 Qe4 Qd2 Kc7 Nxc8 Kxc8 Rae1 Qf5 Bf2 Qd5 Qxd5 Bxd5 
 19	+2.27 	8.02M  	0:00.42	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxe4 Bxd7 Bxd7 Nxf6 Qc6 Nd5+ f6 Nxf6 Kc8 Nxd7 Kxd7 Qd2 d5 Rae1 Bc5+ Kh1 Rae8 Re5 Rxe5 fxe5 h6 
 18	+2.34!	7.32M  	0:00.38	Nxe6! 
 17	+2.10 	2.48M  	0:00.14	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxb2 Bxd7 Bxd7 Rb1 Qa3 Nxf6 Bb5 Rf3 Qc5+ Kh1 Rc8 Nd5+ Ke8 Rc3 Qxc3 Nxc3 Rxc3 Bh4 Be7 Bf2 
 16	+2.06 	2.13M  	0:00.12	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxb2 Rb1 Qa3 Bxd7 Bxd7 Nxf6 Bb5 Rf3 Qxa2 Nd5+ f6 Nxf6 h6 Rh3 Be7 
 15	+1.70 	889521	0:00.05	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxb2 Rb1 Qa3 Bxd7 Bxd7 Nxf6 Bb5 Nd5+ f6 Bh4 Rc8 Bf2 Bxf1 
 14	+1.30 	729476	0:00.04	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxb2 Bxd7 Bxd7 Rb1 Qa3 Nxf6 Qc5+ Rf2 Bc6 Nd5+ f6 Bh4 
 13	+1.30!	710619	0:00.04	Nxe6! 
 12	+1.59 	524524	0:00.03	Nxe6 Qxe6 Nd5 Kd8 Bg4 Qe5 f4 Qxb2 Rb1 Qa3 Bxd7 Bxd7 Nxf6 Bc6 
 11	+1.22!	397837	0:00.02	Nxe6! 
 10	+0.87!	304066	0:00.02	Nxe6! 
  9	+0.76 	174079	0:00.01	Be2 Qc7 Be3 Be7 f4 O-O a4 h6 Bf3 
  8	+1.23!	54718  	0:00.00	Be2! 
  7	+1.00!	38350  	0:00.00	Be2! 
  6	+1.01 	28069  	0:00.00	Nb3 Nxh5 Qxh5 Nf6 Bxf6 gxf6 
  5	+1.01 	25005  	0:00.00	Nb3 Nxh5 Qxh5 Nf6 Bxf6 
  4	+7.61 	5606    	0:00.00	Be2 Ne5 Bxc4 Nxc4 
  3	+7.64 	4196    	0:00.00	Be2 d5 Bxc4 
  2	+7.71 	3035    	0:00.00	Be2 d5 
  1	+2.58 	1930    	0:00.00	Be2 
  0	#
Notlot#5
[d]r2qrb1k/1p1b2p1/p2ppn1p/8/3NP3/1BN5/PPP3QP/1K3RR1 w - - 0 1
Stockfish 8 64bit 3CPU running on 2016 hardware found e5!! in 13 seconds.
BM: "Deep Thought got > +3 in four hours. I've gotten +5 in 93 hours. So this one is correct and extremely difficult."

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 34	+6.84 	2.17G	1:36.68	e5 dxe5 Ne4 Nh5 Nf3 Bb5 Nxe5 Bxf1 Nf7+ Kg8 Nxh6+ Kh8 Nf7+ Kg8 Rxf1 Qh4 Neg5 Re7 Nxe6 Rxf7 Ng5 Nf4 Bxf7+ Kh8 Qg3 Qxg3 hxg3 g6 gxf4 Bh6 Bxg6 Kg7 Be4 a5 Rh1 Rh8 Bxb7 Kf6 c4 Bg7 Rxh8 Bxh8 Bd5 Ke7 Ne6 Bf6 Kc2 Kd7 Nc5+ Ke7 Ne4 Bg7 b3  
 33	+6.75 	1.48G	1:07.64	e5 dxe5 Ne4 Nh5 Nf3 Bb5 Nxe5 Bxf1 Nf7+ Kg8 Nxh6+ Kh8 Nf7+ Kg8 Rxf1 Qh4 Neg5 Re7 Nxe6 Rae8 Ne5 Rxe6 Qg6 Nf6 Bxe6+ Rxe6 Qf7+ Kh7 Qxe6 Qd4 a3 Bd6 Nf3 Qf4 Qh3+ Kg8 Qc8+ Bf8 Qxb7 Qd6 Ng5 Qd5 Qxd5+ Nxd5 Rd1 Nf4 Rd8 g6 Ra8 Kg7 Rxa6 Be7 
 32	+6.68 	1.09G	0:50.70	e5 dxe5 Ne4 Nh5 Nf3 Bb5 Nxe5 Bxf1 Nf7+ Kg8 Nxh6+ Kh8 Nf7+ Kg8 Rxf1 Qh4 Neg5 Re7 Nxe6 Rxf7 Ng5 Nf4 Bxf7+ Kh8 Qg3 Qxg3 hxg3 g6 gxf4 Kg7 Bd5 Rb8 Ne6+ Kf6 Nxf8 Rxf8 Bxb7 a5 Be4 Kg7 c4 Kf7 Kc2 Ke7 Bxg6 Rg8 Be4 Kd6 b3 Kc7 Bd5 Rh8 Rf2  
 31	+6.56 	852.4M	0:40.35	e5 dxe5 Ne4 Nh5 Nf3 Bb5 Nxe5 Bxf1 Nf7+ Kg8 Nxh6+ Kh8 Nf7+ Kg8 Rxf1 Qh4 Neg5 Re7 Nxe6 Rxf7 Ng5 Nf4 Qg3 Qxg3 Bxf7+ Kh8 hxg3 Nh5 Bxh5 g6 Bf3 a5 Bxb7 Rb8 Rh1+ Kg7 Ne6+ Kf6 Nxf8 Rxb7 Rf1+ Ke5 Nxg6+ Ke6 Nf4+ Kd6 c3 a4 Kc2 Rh7 Rg1 Kc6 
 30	+6.45 	704.0M	0:33.58	e5 dxe5 Ne4 Nh5 Nf3 Bb5 Nxe5 Bxf1 Nf7+ Kg8 Nxh6+ Kh8 Nf7+ Kg8 Rxf1 Qh4 Neg5 Re7 Nxe6 Rxf7 Ng5 Nf4 Qg3 Qxg3 Bxf7+ Kh8 hxg3 Nh3 Nxh3 g6 Bxg6 Bh6 Nf4 Rg8 Rh1 Kg7 Be4 Bxf4 gxf4 b5 Rg1+ Kf8 Rxg8+ Kxg8 c3 a5 Bc6 b4 cxb4 axb4 Kc2 Kf7  
 29	+6.10 	449.1M	0:22.02	e5 dxe5 Ne4 Nh5 Nf3 Bb5 Nxe5 Bxf1 Nf7+ Kg8 Nxh6+ Kh8 Nf7+ Kg8 Rxf1 Qh4 Neg5 Re7 Nxe6 Rae8 Ne5 Rxe6 Qg6 Nf6 Bxe6+ Rxe6 Qf7+ Kh7 Qxe6 Qd4 a3 Bd6 Nf3 Qc5 Rg1 Kh8 Qf7 Qc7 Rxg7 Qxf7 Rxf7 Ng4 h3 Ne5 Nxe5 Bxe5 Rxb7 Kg8 c3 Kf8 Ra7 Kg8 
 28	+6.00 	354.6M	0:17.60	e5 dxe5 Ne4 Nh5 Nf3 Bb5 Nxe5 Bxf1 Nf7+ Kg8 Nxh6+ Kh8 Nf7+ Kg8 Rxf1 Qh4 Neg5 Re7 Nxe6 Rxf7 Ng5 Nf4 Qg3 Qxg3 Bxf7+ Kh8 hxg3 g6 gxf4 Kg7 Bd5 Be7 Rh1 Bxg5 fxg5 Re8 Bxb7 a5 Rg1 Re7 Bd5 Re5 c4 
 28	+5.96?	348.3M	0:17.30	e5 dxe5? 
 27	+6.04 	347.0M	0:17.24	e5 dxe5 Ne4 Nh5 Nf3 Bb5 Nxe5 Bxf1 Nf7+ Kg8 Nxh6+ Kh8 Nf7+ Kg8 Rxf1 Qh4 Neg5 Re7 Nxe6 Rae8 Ne5 Rxe6 Qg6 Nf6 Bxe6+ Rxe6 Qf7+ Kh7 Qxe6 Qd4 a3 Bd6 Nf3 Qc5 Rg1 Kh8 Qf7 Qc7 Rxg7 Qxf7 Rxf7 Ng4 h3 Ne5 Nxe5 Bxe5 Rxb7 Kg8 c3 Bg7 
 27	+6.00!	329.9M	0:16.41	e5! 
 27	+5.49!	270.7M	0:13.51	e5! 
 27	+4.98!	249.2M	0:12.50	e5! 
 27	+4.69?	238.3M	0:11.98	e5 dxe5? 
 26	+4.77!	187.5M	0:09.58	e5! 
 26	+4.37!	173.3M	0:08.88	e5! 
 26	+3.98!	168.7M	0:08.66	e5! 
 25	+3.59!	167.9M	0:08.62	e5! 
 25	+3.23!	109.7M	0:05.70	Nf3! 
 24	+2.91!	82.4M  	0:04.30	Nf3! 
 24	+2.77?	64.4M  	0:03.39	Nf3 Bc6? 
 24	+2.85?	60.6M  	0:03.19	Nf3 Bc6? 
 23	+2.92 	54.8M  	0:02.90	Nf3 Bc6 Nh4 g5 Ng6+ Kh7 h4 g4 Nf4 Bg7 Nxe6 Rxe6 Bxe6 h5 Qd2 Be8 Rd1 Qb6 Rge1 Bg6 Bf5 Bxf5 exf5 Re8 Rxe8 Nxe8 Qg5 Nf6 Qg6+ Kh8 Qf7 Qb4 a3 Qb6 
 22	+3.00!	36.7M  	0:01.95	Nf3! 
 21	+2.71 	22.0M  	0:01.18	Nf3 Bc6 Nh4 g5 Ng6+ Kh7 h4 g4 Nf4 Bg7 Nxe6 Qe7 Nd5 Bxd5 exd5 Kh8 Qf2 Nd7 Rxg4 Rf8 Nxf8 Rxf8 Qg1 Ne5 Re4 b5 c3 Rf6 Bc2 Kh7 Rxf6 
 20	+2.55!	19.8M  	0:01.06	Nf3! 
 19	+2.69!	12.3M  	0:00.66	Nf3! 
 18	+2.71 	8.22M  	0:00.44	Nf3 e5 Nh4 g5 Bf7 Bg7 Bxe8 Qxe8 Nf5 Bxf5 Rxf5 Qd7 Qh3 g4 Qd3 Rf8 Nd5 b5 Nxf6 Rxf6 Rxg4 Rxf5 exf5 
 17	+2.48!	5.98M  	0:00.33	Nf3! 
 16	+2.51 	3.55M  	0:00.20	Nf3 e5 Nh4 g5 Bf7 Bg7 Bxe8 Bxe8 Nf5 Bf8 Qh3 Nh5 Nd5 Bg6 Qb3 Nf4 Nxf4 Bxf5 exf5 
 15	+2.34!	3.20M  	0:00.18	Nf3! 
 14	+2.22 	1.89M  	0:00.11	Nf3 e5 Nh4 g5 Bf7 Bg7 Bxe8 Qxe8 Nf5 Qf8 Nxg7 Qxg7 Qd2 Bc6 Qxd6 Nxe4 Nxe4 
 13	+1.50!	1.04M  	0:00.06	Nf3! 
 12	+1.33 	761459	0:00.05	Nf3 Bc6 Nd4 Bd7 Nce2 g5 h4 g4 Nf4 e5 Nfe6 Bxe6 Nxe6 Rxe6 Bxe6 
 11	+1.48!	494337	0:00.03	Nf3! 
 10	+1.43 	321923	0:00.02	Nce2 e5 Nf5 Bxf5 Rxf5 d5 Bxd5 Qe7 Nc3 Red8 Bb3 
  9	+1.08!	129058	0:00.01	Nce2! 
  8	+0.75!	64811  	0:00.01	a3! 
  7	+0.57!	37276  	0:00.00	a3! 
  6	+0.84 	8530    	0:00.00	Qg6 b6 a4 e5 Nde2 b5 
  5	+0.93 	5392    	0:00.00	Qg6 b6 Qf7 e5 Nf3 
  4	+0.88 	3931    	0:00.00	Qg6 b6 a3 a5 
  3	+0.67 	2844    	0:00.00	Qg6 b5 a3 
  2	+0.60 	1843    	0:00.00	h3 a5 
  1	+0.83 	766      	0:00.00	a4 
  0	#
Nolot#6
[d]rnbqk2r/1p3ppp/p7/1NpPp3/QPP1P1n1/P4N2/4KbPP/R1B2B1R b kq - 0 1
BM: "I don't think that anyone has ever solved this."

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 29	 -1.06!	1.50G	1:21.33	axb5! 
 28	 -0.93!	1.18G	1:04.22	axb5! 
 28	 -0.85!	831.7M	0:44.94	axb5! 
 28	 -0.77!	683.4M	0:36.88	axb5! 
 28	 -0.68!	591.0M	0:31.90	axb5! 
 28	 -0.60!	521.1M	0:28.16	axb5! 
 27	 -0.52!	424.2M	0:22.96	axb5! 
 27	 -0.46!	385.3M	0:20.89	axb5! 
 27	 -0.40!	337.5M	0:18.33	axb5! 
 27	 -0.34!	294.1M	0:15.98	axb5! 
 26	 -0.28!	249.7M	0:13.56	axb5! 
 26	 -0.24!	167.5M	0:09.09	axb5! 
 26	 -0.19!	152.3M	0:08.27	axb5! 
 25	 -0.15!	140.5M	0:07.64	axb5! 
 25	 -0.11!	138.6M	0:07.53	axb5! 
 24	 -0.07!	127.3M	0:06.92	axb5! 
 23	  0.00 	94.8M  	0:05.15	axb5 Qxa8 Qc7 h3 Bd4 Nxd4 exd4 Qa7 Qe5 hxg4 Qg3 Kd1 Qb3+ Ke1 Qg3+ Kd1 
 22	  0.00 	84.5M  	0:04.58	axb5 Qxa8 Qc7 h3 Bd4 Nxd4 exd4 Qa7 Qe5 hxg4 Qg3 Kd1 Qb3+ Ke1 Qg3+ Kd1 
 21	  0.00 	60.3M  	0:03.28	axb5 Qxa8 Qc7 h3 Bd4 Nxd4 exd4 Qa7 Qe5 hxg4 Qg3 Kd1 Qb3+ Ke1 Qg3+ Kd1 
 20	+0.26!	30.8M  	0:01.72	axb5! 
 19	+0.48!	20.7M  	0:01.17	axb5! 
 18	+0.63!	13.6M  	0:00.77	O-O! 
 17	+0.71 	10.3M  	0:00.57	O-O h3 Bd4 Nbxd4 Nf6 Qc2 cxd4 Kf2 a5 Rb1 Bd7 Bd3 axb4 axb4 Ba4 Qe2 Nbd7 Ra1 b6 Bd2 Qc7 
 16	+0.65!	4.23M  	0:00.24	O-O! 
 15	+0.80!	3.77M  	0:00.21	O-O! 
 14	+0.87 	2.41M  	0:00.13	O-O h3 Bd4 Nbxd4 Nf6 Qc2 cxd4 Kf2 a5 Bd2 axb4 Bxb4 Re8 c5 h6 Bd3 Nbd7 Qb3 b6 
 13	+0.36!	714732	0:00.04	Nc6! 
 12	+0.52 	300595	0:00.02	Nc6 h3 axb5 Qxa8 Nd4+ Kd1 Ne3+ Bxe3 Bxe3 bxc5 O-O Rb1 Qc7 Nxd4 exd4 
 11	+0.48!	166364	0:00.01	Nc6! 
 10	+0.65!	111266	0:00.01	O-O! 
  9	+0.75 	67483  	0:00.01	Nc6 h3 axb5 Qxa8 Nd4+ Kd1 Ne3+ Bxe3 Bxe3 bxc5 Nb3 
  8	+0.84!	60278  	0:00.00	Nc6! 
  7	+0.86 	39118  	0:00.00	Nc6 h3 axb5 Qxa8 Nd4+ Kd1 Nb3 hxg4 
  6	+0.81 	34065  	0:00.00	Nd7 Nd6+ Kf8 Ng5 Nb6 Ngxf7 Nxa4 
  5	+0.18 	18773  	0:00.00	Nc6 h3 axb5 Qxa8 Nd4+ Kd1 
  4	+0.18 	16098  	0:00.00	Nc6 h3 axb5 Qxa8 Nd4+ Kd1 
  3	+0.07 	10288  	0:00.00	b6 g3 cxb4 
  2	 -1.75 	3097    	0:00.00	O-O g3 
  1	 -2.08 	2211    	0:00.00	O-O 
  0	#
related to position # 6
[d]1Qb2rk1/1p3ppp/5q2/1p1Pp3/1PPpPBn1/P5P1/7P/R3KB1R b - - 2 1
Tasc R30 found 19... d3! in 2 1/2 hours. It was reported that 19... Bf5!! was even stronger than 19... d3, but I doubt it

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 31	 -6.90 	2.01G	1:27.05	d3 Bxd3 exf4 Rc1 Qd4 Qxf4 Qxd3 Rd1 Qxa3 Ke2 Re8 Rhe1 Ne5 Kf2 bxc4 Kg2 Bg4 Rd2 Bf3+ Kg1 Qxb4 d6 Bg4 Rf1 f6 Qe3 Nf3+ Rxf3 Bxf3 Rf2 Bg4 Qd4 Qb1+ Rf1 Qxe4 Rf4 Qe1+ Rf1 Qe6 d7 Qxd7 Qxd7 Bxd7 Rd1 Be6 Re1 b5 Re2 b4 Kf2 
 30	 -6.72 	1.66G	1:12.33	d3 Bxd3 exf4 Rc1 Qd4 Qxf4 Qxd3 Rd1 Qxa3 Ke2 Re8 Rhe1 Ne5 c5 Bg4+ Kf1 Bxd1 Rxd1 Qxb4 d6 Qc4+ Kg1 Qc2 Rd5 f6 d7 Rd8 Qf5 b4 h4 b3 Qe6+ Kf8 Qd6+ Kf7 Rxe5 Qb1+ Kf2 Qb2+ Ke3 Qxe5 Qxe5 fxe5 Kd3 Rxd7+ Kc3 Rd4 Kxb3 Kg6 
 29	 -6.51 	1.31G	0:57.82	d3 Bxd3 exf4 Rc1 Qd4 Qxf4 Qxd3 Rd1 Qxa3 Ke2 Re8 Rhe1 Ne5 c5 Bg4+ Kf1 Bxd1 Rxd1 Qxb4 d6 Qc4+ Kg1 Qc2 Rd5 f6 d7 Rd8 Qf5 b4 Qe6+ Kf8 Qb6 Nf3+ Kf1 Nxh2+ Kg1 Nf3+ Kf1 Ke7 Qxb4 Kf7 Qa5 Qxe4 Rd1 Qc4+ Kf2 Nd4 Rd2 Rxd7 Qa2 Qxa2 Rxa2 Kg6 
 29	 -6.57?	1.27G	0:56.10	d3 Bxd3? 
 28	 -6.65 	956.9M	0:42.47	d3 Bxd3 exf4 Rc1 Qd4 Qxf4 Qxd3 Rf1 Ne3 Rf2 Qxa3 Rfc2 Nxc2+ Rxc2 bxc4 Rxc4 Bh3 g4 Re8 d6 Qa1+ Qc1 Rxe4+ Kf2 Qf6+ Kg1 Rxg4+ Rxg4 Bxg4 Qa3 Qd4+ Kg2 Qd2+ Kg1 g5 Qg3 Qd4+ Kg2 h6 h4 Qxb4 Qe3 gxh4 Qxh6 Qe4+ Kh2 Qe5+ Kg1 Qg3+ Kh1 
 27	 -6.41!	492.7M	0:22.08	d3! 
 26	 -5.80 	237.7M	0:10.88	d3 Rc1 Bf5 Qa7 exf4 Bxd3 Qb2 Rc2 Qa1+ Kd2 Qxh1 exf5 Nxh2 Be2 f3 Bd3 f2 Qxf2 Nf3+ Kc3 Qa1+ Rb2 bxc4 Bxc4 Qxa3+ Rb3 Qc1+ Qc2 Qa1+ Qb2 Qe1+ Kc2 Qf2+ Kd1 Qg1+ Kc2 Nd4+ Kd3 Nxb3 Qxb3 Rc8 Kd2 Qd4+ Bd3 Qf2+ Kd1 Qxg3 
 25	 -5.77 	194.9M	0:08.95	d3 Rc1 Bf5 Qa7 exf4 Bxd3 Qb2 Rc2 Qa1+ Kd2 Qxh1 exf5 Nxh2 Be2 f3 Bd3 f2 Qxf2 Nf3+ Kc3 Qa1+ Rb2 Qxa3+ Rb3 Qc1+ Qc2 Qa1+ Qb2 Qe1+ Kc2 bxc4 Bxc4 Qf2+ Kd1 Qg1+ Kc2 Nd4+ Kd3 Nxb3 Qxb3 Qxg3+ Kd4 Qf4+ Kc5 
 25	 -5.65?	178.7M	0:08.21	d3 Rc1? 
 24	 -5.72 	167.6M	0:07.70	d3 Rc1 Bf5 Qc7 Bxe4 Be2 dxe2 h3 Bxh1 hxg4 exf4 Qxf4 Qb2 Qe3 bxc4 d6 Rd8 Qc3 Qxc3+ Rxc3 b5 g5 Kf8 a4 bxa4 Rxc4 Rxd6 Rc3 Bc6 Kxe2 Ke7 Ra3 
 24	 -5.28!	113.9M	0:05.27	d3! 
 23	 -4.77!	80.2M  	0:03.73	d3! 
 23	 -4.33!	67.1M  	0:03.10	d3! 
 22	 -4.15!	53.6M  	0:02.48	d3! 
 21	 -3.97 	35.6M  	0:01.65	d3 Rc1 Bf5 Qa7 exf4 Bxd3 Qb2 Rc2 Qa1+ Kd2 Qxh1 exf5 Nxh2 Be2 fxg3 Rc1 g2 Qg1 Nf1+ Rxf1 gxf1=N+ Qxf1 Qh6+ Kc2 Re8 cxb5 Qh2 Kd2 Qe5 Qf3 Qb2+ Ke1 Qd4 d6 Qxd6 Kf1 Qd2 Qd3 Qg5 Qf3 
 20	 -3.79!	25.4M  	0:01.20	d3! 
 19	 -3.90 	14.9M  	0:00.70	d3 Ra2 exf4 Qxf4 Qd4 h3 Re8 Bg2 Ne3 Bf3 Nxc4 g4 Bd7 Rf1 f6 Rff2 Ne3 Rfd2 Rc8 Bd1 Nxd5 Rxd3 Qxd3 
 18	 -3.54!	8.16M  	0:00.39	d3! 
 17	 -2.90 	4.53M  	0:00.21	d3 Ra2 exf4 Qxf4 Qd4 h3 Re8 Bg2 Ne3 e5 Nxg2+ Rxg2 Qa1+ Kd2 Qa2+ Kxd3 bxc4+ Kd4 Qxg2 Rf1 Qb2+ Kxc4 Qc2+ Kd4 Qg6 g4 Bd7 Rc1 Bb5 Qe3 
 16	 -2.62!	2.79M  	0:00.13	d3! 
 15	 -2.27!	1.76M  	0:00.08	d3! 
 14	 -2.04 	1.31M  	0:00.06	d3 Rc1 exf4 Qxf4 Qd4 e5 d2+ Qxd2 Qe4+ Qe2 Qxh1 h3 Nh2 Qg2 Qxf1+ Qxf1 Nxf1 Kxf1 Bxh3+ Kf2 bxc4 Rxc4 Re8 Rc7 Rxe5 Rxb7 g5 a4 
 13	 -2.60!	921460	0:00.04	d3! 
 12	 -2.50 	786734	0:00.04	d3 Ra2 exf4 Qxf4 Qd4 c5 Re8 Bg2 Ne3 Bf3 Bh3 Kd2 Nc4+ Kc1 Qc3+ Kb1 Nxa3+ Rxa3 Qxa3 
 11	 -1.82!	264438	0:00.01	d3! 
 10	 -1.32!	141380	0:00.01	d3! 
  9	 -1.19!	55224  	0:00.00	d3! 
  8	 -0.94 	34573  	0:00.00	d3 Rc1 exf4 Qxf4 Qd4 Bxd3 Qxd3 h3 Nf6 
  7	 -0.98!	24199  	0:00.00	d3! 
  6	+0.34!	16658  	0:00.00	d3! 
  5	+1.35!	13365  	0:00.00	d3! 
  4	+1.41 	8932    	0:00.00	d3 Rc1 exf4 Qxf4 Qb2 Bxd3 Qxa3 
  3	+1.83 	7046    	0:00.00	exf4 Qxf4 bxc4 Qxf6 
  2	 -1.89 	2888    	0:00.00	d3 Bh3 exf4 
  1	 -0.85 	1505    	0:00.00	d3 h3 exf4 
  0	#
Nolot#7
[d]1r1bk2r/2R2ppp/p3p3/1b2P2q/4QP2/4N3/1B4PP/3R2K1 w k - 0 1
Genius 2 needed more than a month to find 1.Rxd8!!, on a 90 MHz Pentium.
Stockfish 8 64bit 3CPU running on 2016 hardware found Rxd8!! in 8 seconds,
BM: "This one is hard but works. I've gotten +2 in 37 hours"

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 38	+5.69!	1.52G	1:06.86	Rxd8+! 
 37	+5.15 	869.0M	0:38.67	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Re8 Rxe8+ Bxe8 e6 Kh7 Qxa6 Rg8 e7 Bf7 Qd3+ Kh6 Qf5 Bg6 Qe6 Kh7 Kg3 Be8 Qd5 g5 Qf5+ Kh6 Qf6+ Kh7 Kf3 h4 Qf5+ Kh6 Kf2 Bh5 Qf8+ Kh7 Qf6 Be8 Qe5 Bh 
 36	+5.15 	787.8M	0:35.22	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Re8 Rxe8+ Bxe8 e6 Kh7 Qxa6 Rg8 e7 Bf7 Qd3+ Kh6 Qf5 Bg6 Qe6 Kh7 Kg3 Be8 Qd5 g5 Qf5+ Kh6 Qf6+ Kh7 Kf3 h4 Qf5+ Kh6 Kf2 Bh5 Qf8+ Kh7 Qf6 Be8 Qe5 Bh 
 35	+5.15 	711.1M	0:31.89	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Re8 Rxe8+ Bxe8 e6 Kh7 Qxa6 Rg8 e7 Bf7 Qd3+ Kh6 Qf5 Bg6 Qe6 Kh7 Kg3 Be8 Qd5 g5 Qf5+ Kh6 Qf6+ Kh7 Kf3 h4 Qf5+ Kh6 Kf2 Bh5 Qf8+ Kh7 Qf6 Be8 Qe5 Bh 
 34	+5.15 	642.3M	0:28.86	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Re8 Rxe8+ Bxe8 e6 Kh7 Qxa6 Rg8 e7 Bf7 Qd3+ Kh6 Qf5 Bg6 Qe6 Kh7 Kg3 Be8 Qd5 g5 Qf5+ Kh6 Qf6+ Kh7 Kh2 h4 g4 hxg3+ Kxg3 Bh5 Qf8 Be8 Qf5+ Bg6 Qd5 B 
 33	+5.15 	596.9M	0:26.88	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Re8 Rxe8+ Bxe8 e6 Kh7 Qxa6 Rg8 e7 Bf7 Qd3+ Bg6 Qc4 Be8 Kg3 g5 Qd3+ Kh6 Qd5 Kh7 Qf5+ Kg7 Qe5+ Kg6 Kf2 h4 Qd6+ Kg7 g4 hxg3+ Kxg3 Bh5 Qe5+ Kh7 Qf6 
 32	+5.15 	573.2M	0:25.82	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Re8 Rxe8+ Bxe8 e6 Kh7 Qxa6 Rg8 e7 Bf7 Qd3+ Bg6 Qc4 Be8 Kg3 g5 Qd3+ Kh6 Qd5 Kh7 Qf5+ Kg7 Qe6 Bg6 Qe5+ Kf7 Qd5+ Kg7 Qxg5 Re8 Kh4 Kf7 Qf4+ Kxe7 g4 
 31	+5.15 	570.3M	0:25.68	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Re8 Rxe8+ Bxe8 e6 Kh7 Qxa6 Rg8 e7 Bf7 Qd3+ Bg6 Qc4 Be8 Kg3 g5 Qd3+ Kh6 Qd5 Kg7 Qf5 Bc6 Qe6 Be8 Qd5 Bf7 Qe5+ Kg6 Kf3 Re8 Qd6+ Kg7 Ke4 Ra8 Qe5+ K 
 30	+5.09 	489.8M	0:22.09	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Re8 Rxe8+ Bxe8 e6 Kh7 Qxa6 Rg8 e7 Bf7 Qd3+ Bg6 Qc4 Re8 Qe6 Rg8 Kg3 Rb8 Kf4 Kh6 Qd5 Re8 Qe5 Rh8 Qc5 Re8 Qd6 Ra8 Qe5 Re8 g4 h4 Qe1 
 29	+5.09 	481.0M	0:21.69	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Re8 Rxe8+ Bxe8 e6 Kh7 Qxa6 Rg8 e7 Bf7 Qd3+ Bg6 Qc4 Re8 Qe6 Rg8 Kg3 Re8 Kf4 Rb8 Qd5 Kh6 Qe5 Re8 Qe6 Rb8 Qd5 Rb4+ Kf3 Ra4 Qe6 Ra3+ Kf2 Ra8 Kg3 
 28	+4.80 	397.2M	0:18.04	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Kh7 Qf3 Rhe8 Qxh5+ Kg8 Rb6 Re7 e6 Rde8 Qd5 Kh7 Kg3 Kg8 Rd6 Kh7 Kg4 Rf8 h4 Rfe8 Kg5 Rc8 g4 Bc4 Qe5 Bb5 Qf5+ Kg8 Qd5 Rce8 h5 Kh7 Kf4 
 27	+4.43 	332.2M	0:15.16	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Rh7 Re7 Kh8 e6 Rg8 Qc5 g6 Qe5+ Rhg7 Rxg7 Rxg7 Kg3 Kh7 Kf4 g5+ Ke4 Be8 e7 Rg6 Qf5 a5 Kd4 a4 Kc3 a3 Kb3 a2 Kxa2 h4 
 26	+4.14 	310.0M	0:14.15	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Re7+ Kf8 Qxa3 Kg8 f5 h5 fxe6 fxe6 Rxe6 Kh7 Qf3 Rhe8 Qxh5+ Kg8 Rb6 Re7 e6 Rde8 Qd5 Kh7 Kg3 Kg8 Kg4 Kh7 Kf3 Kg8 Rd6 Rb8 Kg3 Be8 Qc4 
 26	+4.20!	292.0M	0:13.33	Rxd8+! 
 26	+3.86!	261.3M	0:11.91	Rxd8+! 
 26	+3.52!	241.4M	0:11.00	Rxd8+! 
 26	+3.18!	229.5M	0:10.46	Rxd8+! 
 26	+2.98?	220.1M	0:10.01	Rxd8+ Rxd8? 
 25	+3.05 	213.6M	0:09.72	Rxd8+ Rxd8 Ba3 Qe2 h3 Qd3 Qb4 Qxe3+ Kh2 Qxa3 Qxa3 Bd7 Ra7 Rf8 Qg3 Rg8 Qh4 h6 Rxa6 Rf8 Qg4 Rg8 Qh5 Bc8 Ra8 Rh8 Qg4 Rh7 Qh4 Rh8 Kg1 Rg8 Kh2 
 24	+2.97!	196.9M	0:08.95	Rxd8+! 
 24	+2.69!	187.5M	0:08.52	Rxd8+! 
 23	+2.42!	179.8M	0:08.17	Rxd8+! 
 23	+2.01?	166.8M	0:07.58	Rxd8+ Kxd8? 
 22	+2.09 	58.0M  	0:02.68	Rxd8+ Kxd8 Rc2 Qh4 Nc4 Bc6 Qe3 Qe7 f5 h6 Qd4+ Qd7 Nd6 Ke7 Qc5 Bd5 fxe6 Kxe6 Qd4 Rxb2 Rxb2 Qc6 h3 Rd8 Kh2 Rxd6 exd6 Qc4 Qxg7 Qf4+ Qg3 Qxd6 Qxd6+ Kxd6 Rb6+ Ke5 
 21	+2.19 	44.4M  	0:02.06	Rxd8+ Kxd8 Rc2 Qh4 Nc4 Bc6 Qe3 Qe7 f5 h6 Qd4+ Qd7 Nd6 Ke7 Qc5 Kf8 Qxc6 Qxc6 Rxc6 Kg8 Bd4 exf5 Rc7 Rd8 Bc3 Rh7 Nxf7 g6 e6 Re8 Rc6 h5 Rxa6 Kf8 Bb4+ Kg7 
 20	+2.23 	20.6M  	0:00.95	Rxd8+ Kxd8 Rc2 Qh4 Nc4 Bc6 Qe3 Ke8 Nd6+ Kd7 h3 Qd8 Nxf7 Qb6 Qxb6 Rxb6 Nxh8 Be4 Re2 Bd5 Rd2 Ke8 Ba3 Rc6 Kh2 Rc7 Bb4 Rb7 Ba3 Rb3 
 19	+2.15!	15.6M  	0:00.72	Rxd8+! 
 18	+1.74 	6.49M  	0:00.30	Rxd8+ Kxd8 Rc1 Ke8 Ba3 Qe2 Qd4 Qd3 Qa7 Qxa3 Qxb8+ Ke7 Qa7+ Bd7 Rd1 Rd8 Nc4 Qb4 Qc7 Qa4 Qc5+ Ke8 Rd4 Qc6 Qa3 Bc8 Nd6+ Rxd6 Rxd6 Qe4 
 17	+1.71!	6.22M  	0:00.29	Rxd8+! 
 16	+1.80!	1.42M  	0:00.07	Rxd8+! 
 15	+1.60 	1.17M  	0:00.06	Rxd8+ Kxd8 Rc1 Ke8 Ba3 Qe2 Qd4 Qd3 Qa7 Qxa3 Qxb8+ Ke7 Qa7+ Bd7 Rd1 Rd8 Nc4 Qb3 Qc5+ Ke8 Rd4 Qb1+ Kf2 h6 Rd2 
 14	+1.48!	884396	0:00.04	Rxd8+! 
 13	+0.81!	405342	0:00.02	Rxd8+! 
 12	+0.42!	311912	0:00.02	Rxd8+! 
 11	+0.57!	158885	0:00.01	Rxd8+! 
 10	+0.42!	122695	0:00.01	Rxd8+! 
  9	+0.21!	80264  	0:00.00	Rxd8+! 
  8	  0.00 	58274  	0:00.00	Rxd8+ Rxd8 Qb4 Rd7 Rc8+ Rd8 Rc7 
  7	 -0.13!	41623  	0:00.00	Rc6! 
  6	+4.90 	12129  	0:00.00	g4 Bxc7 gxh5 h6 Ba3 Bb6 Bd6 
  5	+4.90 	9538    	0:00.00	g4 h6 gxh5 Bxc7 Ba3 Bb6 Bd6 
  4	+5.27 	7033    	0:00.00	g4 g6 gxh5 Bxc7 
  3	+5.03 	4108    	0:00.00	g4 Bxc7 gxh5 
  2	+5.16 	2811    	0:00.00	g4 h6 
  1	+5.22 	1204    	0:00.00	g4 
  0	#
Nolot#8
[d]r3rbk1/ppq2ppp/2b1pB2/8/6Q1/1P1B3P/P1P2PP1/R2R2K1 w - - 0 24
BM: "Hsu expresses doubt about this one, but mine returned a score of +1 after a day. I don't know whether the key move wins or not."

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 36	+0.81 	1.73G	1:25.27	Bxh7+ Kxh7 Qh5+ Kg8 Rd4 Bf3 gxf3 Qc5 Qxc5 Bxc5 Rg4 Bf8 c4 Kh7 Bg5 b6 Rd1 f6 Be3 Rad8 Rgd4 Rxd4 Rxd4 Bb4 Kf1 Kg6 h4 Kf5 h5 e5 Rd7 Re7 Rd5 Re8 Ke2 Ke6 Rb5 Bd6 c5 Bxc5 Bxc5 bxc5 Rxc5 Re7 Ke3 Kd6 Ra5 Rc7 Ke4 
 35	+0.71 	1.55G	1:16.45	Bxh7+ Kxh7 Qh5+ Kg8 Rd4 Bf3 gxf3 Qc5 Qxc5 Bxc5 Rg4 Bf8 c4 Kh7 Bg5 f6 Be3 b6 Rd1 Rad8 Rgd4 Rxd4 Rxd4 Bb4 Kf1 Re7 Ke2 Kg6 h4 Kf5 h5 g5 hxg6 Kxg6 Rh4 Rd7 f4 Rd8 Rh1 Rd7 Kf3 Be7 Rh2 Bb4 Ke4 Bd2 
 34	+0.74 	1.39G	1:09.08	Bxh7+ Kxh7 Qh5+ Kg8 Rd4 Bf3 gxf3 Qc5 Qxc5 Bxc5 Rg4 Bf8 c4 Kh7 Bg5 f6 Be3 b6 Rd1 Rad8 Rgd4 Rxd4 Rxd4 Bb4 Kf1 Re7 Ke2 Kg6 h4 Kf5 h5 g5 hxg6 Kxg6 Rh4 Rd7 f4 Rd8 Rh1 Rd7 Kf3 Be7 Rh2 Bb4 Ke4 Bd2 
 34	+0.77?	1.22G	1:00.94	Bxh7+ Kxh7? 
 33	+0.85 	1.12G	0:56.08	Bxh7+ Kxh7 Qh5+ Kg8 Rd4 Bf3 gxf3 Qc5 Qxc5 Bxc5 Rg4 Bf8 Rd1 Rac8 c4 a6 a4 Rc6 f4 b5 cxb5 axb5 axb5 Rb6 Rg5 Kh7 Bd4 Rd8 Bxb6 Rxd1+ Kg2 Be7 Re5 Bf6 Re3 Rd5 b4 Rxb5 Bc5 Rb7 Kf3 g5 Rb3 gxf4 Kxf4 Rd7 Rg3 
 32	+0.88!	1.11G	0:55.48	Bxh7+! 
 32	+0.78?	1.11G	0:55.31	Bxh7+ Kxh7? 
 31	+0.86 	650.5M	0:33.29	Bxh7+ Kxh7 Qh5+ Kg8 Rd4 Bf3 gxf3 Qc5 Qxc5 Bxc5 Rg4 Bf8 Rd1 b5 Rd7 Rac8 c3 e5 f4 Rxc3 Bxe5 Rxh3 Rxa7 b4 Bd4 Rh5 Rg5 Rh4 Be3 Bd6 Rf5 Re7 Rxe7 Bxe7 Rb5 Bd6 Kg2 Bxf4 Rxb4 
 30	+0.77 	507.5M	0:26.18	Bxh7+ Kxh7 Qh5+ Kg8 Rd4 Bf3 gxf3 Qc5 Qxc5 Bxc5 Rg4 Bf8 Rd1 b5 Rd7 Rac8 c3 e5 f4 Rxc3 Bxe5 Rxh3 Rxa7 Rd3 Ra5 Rd2 Kg2 g6 Rxb5 Rxa2 f5 Ra6 fxg6 fxg6 Rd5 Rae6 Bd4 Rb8 b4 Bxb4 Rh4 
 30	+0.81!	498.1M	0:25.70	Bxh7+! 
 29	+0.70!	470.2M	0:24.36	Bxh7+! 
 28	+0.61 	467.6M	0:24.23	Bxh7+ Kxh7 Qh5+ Kg8 Rd4 Bf3 gxf3 Qc5 Qxc5 Bxc5 Rg4 Bf8 Rd1 b5 c3 Kh7 Bg5 Rac8 Rd7 Kg8 Bf6 e5 f4 Rxc3 Bxe5 Rxh3 Kg2 Rh5 Rxa7 b4 Kf3 g6 Rb7 Bc5 Rg1 Rc8 Rd7 Bf8 Rd2 Bg7 Bxg7 Kxg7 
 27	+0.66 	373.3M	0:19.65	Bxh7+ Kxh7 Qh5+ Kg8 Rd4 Bf3 gxf3 Qc5 Qxc5 Bxc5 Rg4 Bf8 Rd1 b5 c3 Kh7 Bg5 Rac8 Rd7 f5 Rg3 Rxc3 Bf6 Rc2 Rxa7 Rec8 f4 R8c7 Rxc7 Rxc7 Bd4 Bd6 Be5 Bxe5 fxe5 Rc1+ Kg2 
 27	+0.77!	315.5M	0:16.76	Bxh7+! 
 27	+0.70!	312.9M	0:16.62	Bxh7+! 
 27	+0.62!	310.7M	0:16.51	Bxh7+! 
 27	+0.54!	309.0M	0:16.43	Bxh7+! 
 27	+0.46!	306.7M	0:16.31	Bxh7+! 
 27	+0.38?	282.9M	0:15.10	b4 a6? 
 26	+0.46!	245.2M	0:13.16	b4! 
 26	+0.39!	222.0M	0:11.94	b4! 
 26	+0.32!	216.5M	0:11.65	b4! 
 26	+0.25?	213.8M	0:11.50	b4 b5? 
 25	+0.33 	200.3M	0:10.79	b4 b5 a4 a6 axb5 axb5 Rac1 Qb7 c4 Bxg2 Qxg2 Qxg2+ Kxg2 gxf6 c5 Bh6 Ra1 Rxa1 Rxa1 Rb8 Rd1 Kf8 Be2 Ke7 c6 Rg8+ Kf1 Rd8 Ra1 Kd6 Bxb5 
 25	+0.29!	167.3M	0:09.04	b4! 
 25	+0.24!	162.1M	0:08.76	b4! 
 24	+0.19!	148.0M	0:08.01	Re1! 
 23	+0.15 	100.5M	0:05.46	b4 b5 Rac1 Qb7 Be5 a5 a3 f5 Qg3 axb4 axb4 Bxb4 c4 bxc4 Rxc4 Bf8 Rc3 Rec8 Bc4 Qf7 Rdc1 Bb7 Rb3 Rc5 Rxb7 Qxb7 Bxe6+ Kh8 Rxc5 Bxc5 
 23	+0.24!	74.6M  	0:04.07	b4! 
 23	+0.17?	60.4M  	0:03.30	b4 b5? 
 22	+0.25 	39.9M  	0:02.20	b4 a6 c4 Ba4 Re1 g6 c5 Bg7 Bxg7 Kxg7 Qf3 Bc6 Qe3 e5 Rad1 Ba4 Rd2 Rad8 Bc4 Rxd2 Qxd2 Rd8 Qc3 Rd4 Bb3 Bxb3 Qxb3 
 21	+0.29 	23.9M  	0:01.32	b4 a6 c4 Ba4 Re1 g6 c5 Bg7 Bxg7 Kxg7 Qf3 Bc6 Qe3 e5 Rad1 Qe7 Be4 a5 a3 axb4 axb4 Rad8 Rxd8 Qxd8 Bxc6 
 20	+0.29 	20.3M  	0:01.12	b4 a6 c4 Ba4 Re1 g6 c5 Bg7 Bxg7 Kxg7 Qf3 Bc6 Qe3 e5 Rad1 Qe7 Be4 a5 a3 axb4 axb4 Rad8 Rxd8 
 19	+0.18 	15.3M  	0:00.85	b4 a6 c4 Ba4 Re1 g6 c5 Bg7 Bxg7 Kxg7 Qf3 Bc6 Be4 a5 b5 Bxb5 Bxb7 Rad8 a4 Rd3 
 18	+0.18 	13.7M  	0:00.76	b4 a6 c4 Ba4 Re1 g6 c5 Bg7 Bxg7 Kxg7 Qf3 Bc6 Qe3 e5 Rad1 Ba4 Rd2 Rad8 Bc4 Rxd2 Qxd2 Rd8 
 17	+0.22 	11.7M  	0:00.65	b4 a6 c4 Ba4 Re1 g6 c5 Bg7 Bxg7 Kxg7 Qf3 e5 Be4 Rab8 Qa3 Qd7 Bf3 f6 Rab1 Red8 Rbc1 h6 Qe3 
 16	+0.28 	9.55M  	0:00.53	b4 a6 c4 Ba4 Re1 g6 c5 Bg7 Bxg7 Kxg7 Qf3 e5 Be4 Rab8 g4 f6 Kg2 Bc6 Rad1 Rbd8 Rxd8 Rxd8 
 15	+0.22!	9.14M  	0:00.51	Re1! 
 14	+0.27!	3.56M  	0:00.21	b4! 
 13	+0.27 	2.73M  	0:00.16	a4 e5 Bg5 g6 Bc4 h6 Be3 Kh7 Bd3 a6 Bc4 Bg7 Qg3 
 12	+0.30!	953201	0:00.06	b4! 
 11	+0.31 	478012	0:00.03	Re1 g6 b4 a6 Qh4 Bg7 a4 Bxf6 Qxf6 Qd8 Qf4 f5 
 10	+0.41!	302699	0:00.02	Re1! 
  9	+1.05 	132469	0:00.01	Re1 b5 Rad1 Qb7 Ba1 f5 Qg3 Qf7 Be5 
  8	+0.86 	65081  	0:00.00	Re1 h6 Rad1 Qa5 Qg3 Qxa2 Be5 Qa5 
  7	+0.14!	47019  	0:00.00	b4! 
  6	+0.44 	29809  	0:00.00	Re1 b5 Rad1 h6 Ba1 e5 
  5	+0.40!	15437  	0:00.00	c4! 
  4	+0.59 	6560    	0:00.00	a3 a5 Bc3 e5 
  3	+0.93 	4275    	0:00.00	a3 a5 Bc3 
  2	+1.37 	2638    	0:00.00	Qh4 g6 
  1	+2.63 	983      	0:00.00	Qh5 
  0	#
Nolot#9
[d]r4r1k/4bppb/2n1p2p/p1n1P3/1p1p1BNP/3P1NP1/qP2QPB1/2RR2K1 w - - 0 1
Pierre Nolot aledgely repudiated this problem later. Today Nxh6 is favored by many programs.
BM: "I don't think that anyone has ever found the key."

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 30	+2.92!	2.09G	1:44.95	Nxh6! 
 30	+2.82?	1.99G	1:40.16	Nxh6 gxh6? 
 30	+2.90?	1.98G	1:39.62	Nxh6 Bg6? 
 30	+2.97?	1.94G	1:37.38	Nxh6 Bg6? 
 29	+3.05!	1.92G	1:36.34	Nxh6! 
 29	+2.77!	1.45G	1:12.63	Nxh6! 
 28	+2.49 	1.22G	1:01.21	Nxh6 gxh6 Bxh6 Bg6 Bg5 Rfc8 Bf6+ Kg8 Ne1 a4 Bxc6 Rxc6 Bxe7 a3 h5 Bf5 g4 Kh7 gxf5 axb2 Rc2 b1=Q Rxb1 Qxb1 Rxc5 Rxc5 Bxc5 exf5 e6 Qc1 Bxd4 Qg5+ Kf1 fxe6 Qxe6 Qxh5 
 28	+2.60!	1.19G	0:59.55	Nxh6! 
 28	+2.47?	1.18G	0:58.70	Nxh6 gxh6? 
 28	+2.55?	1.15G	0:57.68	Nxh6 gxh6? 
 27	+2.62 	1.10G	0:54.94	Nxh6 gxh6 Bxh6 Qa4 Bg5 Qb5 Bxe7 Nxe7 Ng5 Bg8 Bxa8 Rxa8 Qf3 Nd5 Nxf7+ Bxf7 Qxf7 a4 Rc4 Qd7 Qh5+ Qh7 Qxh7+ Kxh7 Rxc5 Kg6 Ra1 Kf5 Kg2 a3 bxa3 bxa3 Rc4 Kxe5 f4+ Kd6 Rxd4 a2 Kf3 Ke7 Rc4 
 27	+2.46!	976.4M	0:48.81	Nxh6! 
 27	+2.23!	880.9M	0:44.05	Nxh6! 
 26	+2.00 	748.3M	0:37.42	Nf6 Rfc8 Bxh6 gxh6 Qd2 Bf8 Rxc5 Ne7 Rb5 Ra7 Rc1 Raa8 Re1 Ra7 Nxd4 Rac7 Rb6 Ng8 Nc6 Nxf6 exf6 Qb3 d4 Qc4 Ne5 Qc2 Qxc2 Bxc2 Nc6 Kg8 Nxa5 Rd7 Nc6 Ba4 
 26	+2.15!	695.2M	0:34.74	Nf6! 
 26	+1.99?	599.4M	0:29.89	Nf6 Rfc8? 
 25	+2.07!	494.6M	0:24.62	Nf6! 
 25	+1.88!	360.0M	0:17.90	Nf6! 
 25	+1.70!	304.5M	0:15.16	Nf6! 
 24	+1.52!	100.1M	0:05.02	Nxh6! 
 24	+1.36!	81.9M  	0:04.13	Nxh6! 
 23	+1.21!	71.5M  	0:03.60	Nxh6! 
 22	+1.07 	51.3M  	0:02.57	Nxh6 Bg6 Nxf7+ Rxf7 Ng5 Rxf4 Bxc6 Rc8 Ra1 Rxf2 Kxf2 Nxd3+ Qxd3 Qxb2+ Rd2 Bxg5 Rxb2 Bxd3 hxg5 Rxc6 Rxa5 Kh7 Rxb4 Rc2+ Ke1 Re2+ Kd1 Rg2 Rxd4 Rxg3 Ra7 Bf5 Kd2 Kg6 Re7 Rb3 Rc7 Rb1 
 21	+1.27!	45.9M  	0:02.30	Nxh6! 
 20	+1.16 	25.5M  	0:01.28	Nxh6 Bg6 Ne1 gxh6 Bxc6 Rac8 Ra1 Qb3 Be4 Nxe4 dxe4 Qc4 Nd3 Qc2 Qf3 Qc6 Re1 h5 Rxa5 Qb6 Ra4 Ra8 Rxa8 Rxa8 Bg5 Bxg5 hxg5 Rc8 Qf6+ Kh7 
 19	+1.19 	17.4M  	0:00.87	Nxh6 Bg6 Ne1 gxh6 Bxc6 Rac8 Ra1 Qb3 Bb5 Qd5 Bc4 Qd8 Bxh6 Rg8 Ng2 Bf5 Qh5 Bg6 Qf3 a4 Bd2 Qa5 Rdc1 
 18	+1.20!	13.6M  	0:00.68	Nxh6! 
 17	+0.77!	5.14M  	0:00.25	Nxh6! 
 16	+0.45!	3.24M  	0:00.16	Nxh6! 
 15	+0.28!	1.68M  	0:00.09	Nxh6! 
 14	+0.22 	1.37M  	0:00.07	Nxh6 Bg6 Rxc5 Bxc5 Nxf7+ Rxf7 Ng5 Rc7 h5 Bf7 Nxf7+ Rxf7 Bxc6 Rc8 Be4 a4 
 13	+0.27!	957779	0:00.05	Nxh6! 
 12	+0.17!	385208	0:00.02	Nf6! 
 11	 -0.21 	115513	0:00.01	Nf6 Bg6 Nd7 Nxd7 Rxc6 Bh5 Rc7 Qd5 Nxd4 Bxe2 Bxd5 
 10	 -0.26!	83771  	0:00.00	Nf6! 
  9	 -0.22!	41967  	0:00.00	Nf6! 
  8	 -0.31 	32149  	0:00.00	Nf6 Bg6 Ne4 Bxe4 dxe4 d3 Qe3 Qxb2 Rxc5 
  7	 -0.32 	22537  	0:00.00	Nf6 Bg6 Ne4 Bxe4 dxe4 d3 Qe3 Qa4 
  6	 -0.45 	11357  	0:00.00	Nf6 a4 Nxh7 Kxh7 Nd2 Rac8 
  5	 -0.41 	9051    	0:00.00	Nf6 a4 Nxh7 Kxh7 Nh2 
  4	+0.11 	4133    	0:00.00	Nfh2 Na7 Bxa8 Rxa8 Nf3 
  3	+0.18 	3151    	0:00.00	Nfh2 Na7 Bxa8 
  2	+0.47 	2486    	0:00.00	Nfh2 Bxd3 Rxd3 
  1	 -0.68 	551      	0:00.00	Nfh2 
  0	#
Nolot#10
[d]r1b2rk1/1p1nbppp/pq1p4/3B4/P2NP3/2N1p3/1PP3PP/R2Q1R1K w - - 0 15
Stockfish 8 64bit 3CPU running on 2016 hardware Rxf7!! in 9 seconds.
BM: "This one is easy. Rxf7 should come back at +1 pretty quickly. I don't know if anyone has done better than this.

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 31	+2.96!	1.03G	0:52.31	Rxf7! 
 31	+2.69!	932.7M	0:47.51	Rxf7! 
 30	+2.41 	665.4M	0:34.28	Rxf7 Rxf7 Bxf7+ Kh8 Nd5 Qxb2 Nxe7 Nf6 Rb1 Bg4 Bc4 Bxd1 Rxb2 b5 Bd3 bxa4 Kg1 e2 Bxe2 Bxe2 Nxe2 Nxe4 Nd5 a3 Ra2 Rb8 Ndc3 Nxc3 Nxc3 Rb2 Rxa3 Rxc2 Rxa6 g6 Nd5 Kg7 Rxd6 Rd2 Rd7+ Kh6 
 30	+2.31?	612.5M	0:31.66	Rxf7 Rxf7? 
 30	+2.39?	607.1M	0:31.39	Rxf7 Rxf7? 
 29	+2.46 	582.9M	0:30.20	Rxf7 Rxf7 Bxf7+ Kh8 Nd5 Qxb2 Nxe7 Ne5 Nxc8 Ng4 Rb1 Nf2+ Kg1 Nxd1 Rxb2 Nxb2 Nxd6 Nxa4 e5 Nc3 e6 Nd5 c4 Nf6 e7 a5 Bd5 a4 Bxb7 Ra7 Kf1 a3 Ke2 a2 Nc2 a1=Q Nxa1 Rxa1 e8=Q+ Nxe8 Nxe8 Rh1 h3 Rg1 Nd6 Rc1 Kxe3 
 28	+2.48 	524.7M	0:27.27	Rxf7 Rxf7 Bxf7+ Kh8 Nd5 Qxb2 Nxe7 Nf6 Rb1 Bg4 Rxb2 Bxd1 Bc4 b5 Bd3 bxa4 Kg1 e2 Nxe2 Bxe2 Bxe2 Re8 Nd5 a3 Rb6 a5 Ra6 Rxe4 Kf2 a4 Nc3 Re8 Rxa4 Rc8 Nd1 g5 Rxa3 Ne4+ Ke3 
 28	+2.32!	489.5M	0:25.44	Rxf7! 
 28	+2.15!	474.8M	0:24.69	Rxf7! 
 28	+1.97!	458.0M	0:23.81	Rxf7! 
 28	+1.80!	437.4M	0:22.74	Rxf7! 
 28	+1.62!	411.7M	0:21.42	Rxf7! 
 27	+1.45!	396.1M	0:20.65	Rxf7! 
 27	+1.40!	391.3M	0:20.41	Rxf7! 
 27	+1.35!	387.8M	0:20.23	Rxf7! 
 27	+1.31!	387.3M	0:20.21	Rxf7! 
 27	+1.26!	384.9M	0:20.09	Rxf7! 
 27	+1.22!	376.2M	0:19.65	Rxf7! 
 27	+1.17!	375.9M	0:19.64	Rxf7! 
 27	+1.12!	373.7M	0:19.52	Rxf7! 
 27	+1.08!	372.8M	0:19.48	Rxf7! 
 27	+1.03!	371.2M	0:19.39	Rxf7! 
 27	+0.99!	370.0M	0:19.33	Rxf7! 
 27	+0.94!	369.9M	0:19.32	Rxf7! 
 27	+0.90!	369.6M	0:19.31	Rxf7! 
 27	+0.85!	369.5M	0:19.31	Rxf7! 
 27	+0.80!	369.4M	0:19.30	Rxf7! 
 27	+0.76!	367.3M	0:19.20	Rxf7! 
 27	+0.71!	366.3M	0:19.14	Rxf7! 
 27	+0.67!	366.3M	0:19.14	Rxf7! 
 27	+0.62!	366.3M	0:19.14	Rxf7! 
 27	+0.57!	366.3M	0:19.14	Rxf7! 
 27	+0.48!	366.3M	0:19.14	Rxf7! 
 27	+0.42!	366.2M	0:19.14	Rxf7! 
 27	+0.37!	366.2M	0:19.14	Rxf7! 
 27	+0.27!	366.2M	0:19.14	Rxf7! 
 27	+0.22!	293.9M	0:15.45	Bxf7+! 
 27	+0.17!	292.3M	0:15.36	Bxf7+! 
 26	+0.13 	190.9M	0:10.08	Bb3 Bf6 Nd5 e2 Nxe2 Qd8 c3 Be5 Nd4 Nc5 Nf3 Be6 a5 Nd7 Nxe5 Nxe5 Nb6 Rb8 Bd5 Re8 Qe2 Bxd5 Nxd5 Rc8 h3 Qg5 Nb6 Rb8 Rad1 Qg6 Nd5 Nd7 
 25	+0.16 	169.3M	0:08.94	Bb3 Bf6 Nd5 e2 Nxe2 Qd8 Nd4 Be5 c3 Nc5 Nf3 Be6 a5 Nd7 Nxe5 Nxe5 Nb6 Rb8 Bd5 Re8 Qe2 Bxd5 Nxd5 Qg5 Rad1 Qg6 Rf5 Qg4 Qxg4 Nxg4 
 24	+0.20!	117.9M	0:06.26	Bb3! 
 24	+0.13?	111.1M	0:05.89	Bb3 Bf6? 
 24	+0.21?	104.9M	0:05.57	Bb3 Bf6? 
 23	+0.28!	90.4M  	0:04.82	Bb3! 
 23	+0.23!	73.8M  	0:03.94	Bb3! 
 22	+0.18!	40.9M  	0:02.21	Bb3! 
 21	+0.07 	30.4M  	0:01.63	Bb3 Qd8 Qf3 Bf6 Qxe3 Nc5 Nd5 Be5 Bc4 Bg4 c3 Qh4 g3 Qh3 b4 Nxa4 Nf4 Bxf4 Rxf4 b5 Bf1 Qh6 
 20	+0.14!	26.3M  	0:01.41	Bb3! 
 19	+0.07 	15.9M  	0:00.85	Bb3 Qd8 Qf3 Bf6 Qxe3 Nc5 Nd5 Be5 Bc4 Bg4 c3 Qh4 g3 Qh3 b4 Nd7 Be2 Bxe2 Nxe2 Rae8 
 18	  0.00 	11.6M  	0:00.62	Bb3 Qd8 Qf3 Ne5 Qxe3 Bg5 Qf2 Bh4 Qf4 Bg5 Qg3 Bh4 Qf4 
 17	 -0.01!	6.83M  	0:00.37	Bb3! 
 16	+0.05!	4.71M  	0:00.26	Bb3! 
 15	+0.07 	2.81M  	0:00.15	Bb3 Qd8 Qf3 Bf6 Qxe3 Nc5 Nd5 Be5 Nf3 Bxb2 Rab1 Nxb3 cxb3 Bf6 Rbd1 
 14	+0.06!	2.31M  	0:00.13	Bb3! 
 13	 -0.08 	1.16M  	0:00.06	Bb3 Nf6 Qd3 Qc5 Qxe3 Ng4 Qg1 Bf6 Rad1 Be5 h3 Nf6 Rf3 
 12	 -0.26 	650537	0:00.04	Bb3 Nc5 Nd5 Qd8 Qf3 Bg5 Nxe3 Qf6 Nef5 Bxf5 Nxf5 Rac8 
 11	 -0.26!	413186	0:00.02	Bb3! 
 10	 -0.27 	217041	0:00.01	Nf5 Bf6 Qc1 Bg5 h4 Bf6 a5 Qc5 Qxe3 Qxe3 Nxe3 Bxh4 
  9	 -0.28!	168335	0:00.01	a5! 
  8	 -0.13!	75071  	0:00.00	Nf5! 
  7	+0.81 	50924  	0:00.00	Bxf7+ Rxf7 Rxf7 Kxf7 Nd5 Qd8 Nf5 Bf6 
  6	+1.22!	18745  	0:00.00	Bxf7+! 
  5	 -0.45!	15702  	0:00.00	Nf5! 
  4	+2.10 	4956    	0:00.00	Nf5 Ne5 Nxe7+ Kh8 Nxc8 
  3	+3.25 	3371    	0:00.00	Nf5 Qxb2 Nxe7+ Kh8 
  2	+1.66 	2333    	0:00.00	Nf5 Qxb2 
  1	+1.40 	986      	0:00.00	Nf5 
  0	#
Nolot#11
[d]r1b3k1/p2p1nP1/2pqr1Rp/1p2p2P/2B1PnQ1/1P6/P1PP4/1K4R1 w - - 0 1
Stockfish 8 64bit 3CPU running on 2016 hardware found Rxh6!! in 7 seconds, but the position is recognized as drawn today
BM: "This one seems to be pretty easy to find, with a draw score or a score that is a little positive or negative, depending upon the program."

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 35	  0.00 	2.12G	1:34.01	Rxh6 Nxh6 Qg5 Nf7 Qd8+ Nxd8 h6 Qd4 h7+ Kf7 g8=Q+ Ke7 h8=Q Kd6 Rg7 Qxd2 Qxd8 Qd1+ Kb2 Qd4+ Ka3 Qc5+ b4 Qe3+ Kb2 Qd4+ Kc1 Qa1+ Kd2 Qd4+ Kc1 
 34	  0.00 	671.2M	0:30.32	Rxh6 Nxh6 Qg5 Nf7 Qd8+ Nxd8 h6 Qd4 h7+ Kf7 g8=Q+ Ke7 h8=Q Kd6 Rg7 Qxd2 Qxd8 Qd1+ Kb2 Qd4+ Ka3 Qc5+ b4 Qe3+ Kb2 Qd4+ Kc1 Qa1+ Kd2 Qd4+ Kc1 
 33	  0.00 	480.2M	0:21.90	Rxh6 Nxh6 Qg5 Nf7 Qd8+ Nxd8 h6 Qd4 h7+ Kf7 g8=Q+ Ke7 h8=Q Kd6 Rg7 Qxd2 Qxd8 Qd1+ Kb2 Qd4+ Ka3 Qc5+ b4 Qe3+ Kb2 Qd4+ Kc1 Qa1+ Kd2 Qd4+ Kc1 
 32	  0.00 	385.4M	0:17.63	Rxh6 Nxh6 Qg5 Nf7 Qd8+ Nxd8 h6 Qd4 h7+ Kf7 g8=Q+ Ke7 h8=Q Kd6 Rg7 Qxd2 Qxd8 Qd1+ Kb2 Qd4+ Ka3 Qc5+ b4 Qe3+ Kb2 Qd4+ Kc1 Qa1+ Kd2 Qd4+ Kc1 
 31	  0.00 	351.1M	0:16.10	Rxh6 Nxh6 Qg5 Nf7 Qd8+ Nxd8 h6 Qd4 h7+ Kf7 g8=Q+ Ke7 h8=Q Kd6 Rg7 Qxd2 Qxd8 Qd1+ Kb2 Qd4+ Ka3 Qc5+ b4 Qe3+ Kb2 Qd4+ Kc1 Qa1+ Kd2 Qd4+ Kc1 
 30	  0.00 	286.6M	0:13.18	Rxh6 Nxh6 Qg5 Nf7 Qd8+ Nxd8 h6 Qd4 h7+ Kf7 g8=Q+ Ke7 h8=Q Kd6 Rg7 Qxd2 Qxd8 Qd1+ Kb2 Qd4+ Ka3 Qc5+ b4 Qe3+ Kb2 Qd4+ Kc1 Qa1+ Kd2 Qd4+ Kc1 
 30	+0.02?	221.1M	0:10.13	Rxh6 Nxh6? 
 30	+0.10?	195.8M	0:08.94	Rxh6 Nxh6? 
 30	+0.27!	152.5M	0:06.97	Rxh6! 
 30	+0.22!	147.3M	0:06.73	Rxh6! 
 29	+0.17!	137.6M	0:06.28	Rxh6! 
 29	+0.10!	129.2M	0:05.90	Rxh6! 
 29	+0.02!	127.5M	0:05.83	Rxh6! 
 29	 -0.05!	124.9M	0:05.71	Rxh6! 
 29	 -0.12!	123.5M	0:05.65	Rxh6! 
 29	 -0.20!	121.5M	0:05.55	Rxh6! 
 29	 -0.27!	120.5M	0:05.50	Rxh6! 
 29	 -0.35!	118.7M	0:05.42	Rxh6! 
 29	 -0.42!	116.2M	0:05.31	Rxh6! 
 29	 -0.50!	114.8M	0:05.25	Rxh6! 
 29	 -0.57!	111.3M	0:05.09	Rxh6! 
 29	 -0.65!	109.2M	0:04.99	Rxh6! 
 29	 -0.72!	107.8M	0:04.92	Rxh6! 
 29	 -0.80!	107.5M	0:04.91	Rxh6! 
 29	 -0.87!	106.8M	0:04.87	Rxh6! 
 29	 -0.95!	101.9M	0:04.64	Rxh6! 
 28	 -1.02!	88.7M  	0:04.04	Rxh6! 
 28	 -1.10!	87.5M  	0:03.98	Rxh6! 
 28	 -1.17!	85.1M  	0:03.87	Rxh6! 
 27	 -1.25!	81.2M  	0:03.69	Rxh6! 
 27	 -1.32!	77.6M  	0:03.52	Rxh6! 
 27	 -1.40!	76.4M  	0:03.46	Rxh6! 
 26	 -1.47!	74.6M  	0:03.38	Rxh6! 
 25	 -1.55 	52.2M  	0:02.37	Bxe6 dxe6 Rf6 Qe7 Qh4 Bd7 Rxf4 Qxh4 Rxh4 Ng5 Rf1 c5 Rf8+ Rxf8 gxf8=R+ Kxf8 d3 a5 Rh1 Be8 Kc1 Nh7 a3 Nf6 b4 cxb4 axb4 a4 c4 bxc4 dxc4 Ke7 Kb2 Nxe4 
 24	 -1.62 	39.1M  	0:01.78	Bxe6 dxe6 Rf6 Qe7 Qh4 Bd7 Rxf4 Qxh4 Rxh4 Ng5 Rf1 c5 Rf8+ Rxf8 gxf8=R+ Kxf8 d3 Ke7 Rh1 Nf3 Kc1 Be8 Rf1 Nd4 Kd2 b4 c3 Nb5 cxb4 cxb4 Rf2 Nc3 
 23	 -1.67!	38.2M  	0:01.75	Bxe6! 
 22	 -1.74 	26.8M  	0:01.22	Bxe6 dxe6 Rf6 Qe7 Qh4 Bd7 Rxf4 Qxh4 Rxh4 Ng5 Rhh1 c5 d3 Kxg7 Kb2 a5 Rg2 Be8 Kc3 a4 b4 c4 dxc4 bxc4 Rh4 Rc8 Rhh2 Kf6 Rg4 Kf7 
 21	 -1.64 	11.4M  	0:00.54	Bxe6 dxe6 Rf6 Qe7 Qh4 Bd7 Rxf4 Qxh4 Rxh4 Ng5 Rf1 c5 d3 Kxg7 Rh2 Be8 Kb2 a5 Rg1 Rd8 Kc3 Kf6 Rf2+ Ke7 Rh1 Ra8 Rhf1 b4+ Kb2 Bxh5 
 20	 -1.45 	8.82M  	0:00.42	Bxe6 dxe6 Rf6 Qe7 Qh4 Bd7 Rxf4 Qxh4 Rxh4 Ng5 Rf1 Kxg7 Kb2 a5 d3 c5 Rhh1 a4 a3 Ra6 Rh2 Be8 b4 cxb4 axb4 
 19	 -1.45 	7.91M  	0:00.38	Bxe6 dxe6 Rf6 Qe7 Qh4 Bd7 Rxf4 Qxh4 Rxh4 Ng5 Rf1 Kxg7 Kb2 Be8 d3 a5 Rhh1 c5 a3 c4 dxc4 bxc4 
 18	 -1.58!	4.19M  	0:00.20	Bxe6! 
 17	 -1.95!	2.68M  	0:00.13	Bxe6! 
 16	 -2.25!	1.97M  	0:00.09	Bxe6! 
 15	 -2.63!	1.53M  	0:00.07	Bxe6! 
 14	 -2.42!	1.22M  	0:00.06	Bxe6! 
 13	 -1.36 	911512	0:00.04	Bxe6 dxe6 Rf6 Qe7 Qh4 Bb7 Rxf4 Qxh4 Rxh4 Ng5 Rhg4 Kxg7 d3 Kf7 Kb2 a5 Rf1+ Ke7 
 12	 -4.32 	97449  	0:00.01	Bxe6 dxe6 Qh4 Qd4 Qe7 Bd7 Rf1 Re8 Qf6 Qxe4 d3 Qd4 
 11	 -3.91 	94534  	0:00.01	Bxe6 dxe6 Qh4 Qd4 Qe7 Bd7 Rf1 Re8 Qf6 Qxd2 Rg4 Bc8 Rg3 
 10	 -3.97!	88091  	0:00.01	Bxe6! 
  9	 -4.15!	34967  	0:00.00	Bxe6! 
  8	 -3.79!	16482  	0:00.00	Bxe6! 
  7	 -4.05!	11391  	0:00.00	Bxe6! 
  6	 -4.57 	10398  	0:00.00	Bxe6 dxe6 Rf6 Qe7 Rxf4 exf4 
  5	 -4.25 	8665    	0:00.00	Bxe6 dxe6 Rf6 Qe7 Rxf4 exf4 
  4	 -2.32 	6650    	0:00.00	Bxe6 dxe6 Rf6 Qe7 
  3	 -6.42 	5291    	0:00.00	Bxe6 dxe6 d3 
  2	 -3.29 	2870    	0:00.00	Bxe6 dxe6 
  1	 -2.62 	1603    	0:00.00	Bxe6 
  0	#
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Dann Corbit
Posts: 12537
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: ThrowBack Tuesday - Nolot 11

Post by Dann Corbit »

Thanks for the trip down memory lane.
Exponential advance in hardware.
Exponential advance in software.
Too bad our brains can't do the same thing, or, at least, I don't know how to make mine do that.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
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Vinvin
Posts: 5228
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: ThrowBack Tuesday - Nolot 11

Post by Vinvin »

MikeB wrote:Pierre Nolot created the Nolot Test Suite, 11 test positions that were quite difficult for chess computers and programs to solve in 1994. In fact, they were once described as "11 tactical positions computers can't solve" by Marc-François Baudot, co-author of Virtual Kasparov for Game Boy Advance and Play Station. So let's take at some of the comments made back then as well as some made more recently with some analysis by dev- SF-McBrain 5.0
I've a some runs on the Nolot set for the last 3 years but I posted about none. I'll try find the results.

Here is the post from Feng-Hsiung Hsu in 1994 about DB II on the Nolot set : https://groups.google.com/forum/#!topic ... KU0Mkn4gvQ

Report from kgburcham with Houdini 1.5 in 2011 : http://talkchess.com/forum/viewtopic.ph ... 458#420458
Last edited by Vinvin on Wed Jan 24, 2018 1:50 pm, edited 1 time in total.
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Vinvin
Posts: 5228
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: ThrowBack Tuesday - Nolot 11

Post by Vinvin »

MikeB wrote:Nolot#9
[d]r4r1k/4bppb/2n1p2p/p1n1P3/1p1p1BNP/3P1NP1/qP2QPB1/2RR2K1 w - - 0 1
Pierre Nolot aledgely repudiated this problem later. Today Nxh6 is favored by many programs.
BM: "I don't think that anyone has ever found the key."

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 30	+2.92!	2.09G	1:44.95	Nxh6! 
 30	+2.82?	1.99G	1:40.16	Nxh6 gxh6? 
 30	+2.90?	1.98G	1:39.62	Nxh6 Bg6? 
 30	+2.97?	1.94G	1:37.38	Nxh6 Bg6? 
 29	+3.05!	1.92G	1:36.34	Nxh6! 
 29	+2.77!	1.45G	1:12.63	Nxh6! 
 28	+2.49 	1.22G	1:01.21	Nxh6 gxh6 Bxh6 Bg6 Bg5 Rfc8 Bf6+ Kg8 Ne1 a4 Bxc6 Rxc6 Bxe7 a3 h5 Bf5 g4 Kh7 gxf5 axb2 Rc2 b1=Q Rxb1 Qxb1 Rxc5 Rxc5 Bxc5 exf5 e6 Qc1 Bxd4 Qg5+ Kf1 fxe6 Qxe6 Qxh5 
 28	+2.60!	1.19G	0:59.55	Nxh6! 
 28	+2.47?	1.18G	0:58.70	Nxh6 gxh6? 
 28	+2.55?	1.15G	0:57.68	Nxh6 gxh6? 
 27	+2.62 	1.10G	0:54.94	Nxh6 gxh6 Bxh6 Qa4 Bg5 Qb5 Bxe7 Nxe7 Ng5 Bg8 Bxa8 Rxa8 Qf3 Nd5 Nxf7+ Bxf7 Qxf7 a4 Rc4 Qd7 Qh5+ Qh7 Qxh7+ Kxh7 Rxc5 Kg6 Ra1 Kf5 Kg2 a3 bxa3 bxa3 Rc4 Kxe5 f4+ Kd6 Rxd4 a2 Kf3 Ke7 Rc4 
...
The 3 best moves seems to win easily :

Code: Select all

FEN: r4r1k/4bppb/2n1p2p/p1n1P3/1p1p1BNP/3P1NP1/qP2QPB1/2RR2K1 w - - 0 1

McBrain_2017_v30_TCEC-x86-64-bmi2:
...
 32/52	10:04	 3.969.068k	6.566k	+2,46	1.Fxh6 gxh6 2.Dd2 Tg8 3.Cxh6 Tg7 4.Txc5 Fxc5 5.Cg5 Fg6 6.Fxc6 Tc8 7.Fe4 Fe7 8.Fxg6 fxg6 9.Cg4 Dd5 10.Tc1 Tf8 11.Cf6 Fxf6 12.exf6 Td7 13.Ce4 Dh5 14.Tc6 Rg8 15.Dc1 Tdf7 16.Txe6 a4 17.Cg5 Txf6 18.Txf6 Txf6 19.Dc4+ Rg7 20.Dxb4 Dd1+ 21.Rg2
 32/58	10:04	 3.969.068k	6.566k	+2,47	1.Cf6 Tac8 2.Fxh6 Da4 3.Cxh7 Rxh7 4.Fg5 Rg8 5.Tc4 Cb3 6.Txc6 Dxc6 7.Fxe7 Dc2 8.Dxc2 Txc2 9.Fxf8 Rxf8 10.Tb1 a4 11.Ff1 Tc5 12.Fe2 Tc1+ 13.Txc1 Cxc1 14.Rf1 a3 15.bxa3 bxa3 16.Cxd4 a2 17.Cc2 Cb3 18.Re1 Re7 19.g4 f6 20.exf6+ Rxf6 21.g5+ Re5 22.h5 Cd4 23.Ca1 Rf5 24.h6 gxh6 25.gxh6
 32/69	10:04	 3.969.068k	6.566k	+2,78	1.Cxh6 gxh6 2.Fxh6 Fg6 3.Fg5 Tfc8 4.Ff6+ Rg8 5.Ce1 a4 6.h5 Ff5 7.g4 Fe4 8.dxe4 a3 9.Dd2 Ff8 10.Tb1 axb2 11.Txb2 Da7 12.Cf3 Cxe4 13.Df4 Cxf6 14.exf6 Da4 15.Dg5+ Rh7 16.Dd2 Rg8 17.Ch4 Da5 18.Tc1 b3 19.Fxc6 Dxd2 20.Txd2
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: ThrowBack Tuesday - Nolot 11

Post by zullil »

MikeB wrote: Nolot#8
[d]r3rbk1/ppq2ppp/2b1pB2/8/6Q1/1P1B3P/P1P2PP1/R2R2K1 w - - 0 24
BM: "Hsu expresses doubt about this one, but mine returned a score of +1 after a day. I don't know whether the key move wins or not."
Is the current consensus that this position is drawn?
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User avatar
MikeB
Posts: 4889
Joined: Thu Mar 09, 2006 6:34 am
Location: Pen Argyl, Pennsylvania

Re: ThrowBack Tuesday - Nolot 11

Post by MikeB »

zullil wrote:
MikeB wrote: Nolot#8
[d]r3rbk1/ppq2ppp/2b1pB2/8/6Q1/1P1B3P/P1P2PP1/R2R2K1 w - - 0 24
BM: "Hsu expresses doubt about this one, but mine returned a score of +1 after a day. I don't know whether the key move wins or not."
Is the current consensus that this position is drawn?
I'm not sure. I personally think the position is drawn if white plays Bxh7 and would be surprised if it was determined that white has a forced win ,but with that said, white has all the winning chances and black has none. . I get this sense from watching some blitz 5 & 3 blitz games between asmfish and SF-McB running 18 threads each.

A sample game:
the plus with a whole number reflects seconds left on the clock

[pgn][Event "Mac Pro x5690 3.46 Ghz 18 CPU"]
[Site "Mac-Pro.local"]
[Date "2018.01.24"]
[Round "-"]
[White "SF-McB v5.0 64 POPCNT"]
[Black "asmFishX_2018-01-22_popc"]
[Result "1/2-1/2"]
[TimeControl "300+3"]
[FEN "r3rbk1/ppq2ppp/2b1pB2/8/6Q1/1P1B3P/P1P2PP1/R2R2K1 w - - 0 1"]
[SetUp "1"]

1. Bxh7+ Kxh7 {-0.84/27 +297} 2. Qh5+ {+0.87/29 +287} Kg8 {-0.84/1 +300} 3.
Rd4 {+0.85/30 +287} Bf3 {-0.76/28 +299} 4. gxf3 {+0.89/28 +287} Qc5
{-0.60/28 +298} 5. Qxc5 {+0.87/29 +285} Bxc5 {-0.75/29 +294} 6. Rg4
{+0.86/30 +281} Bf8 {-0.72/31 +289} 7. c4 {+0.90/31 +269} Kh7
{-0.92/34 +282} 8. Bg5 {+0.88/32 +263} f6 {-0.90/31 +256} 9. Be3
{+0.95/31 +260} b6 {-0.85/34 +249} 10. Rd1 {+1.02/33 +255} Rad8
{-1.08/35 +225} 11. Rgd4 {+1.14/29 +254} Rxd4 {-1.02/36 +225} 12. Rxd4
{+1.18/32 +248} Kg6 {-0.99/40 +223} 13. a4 {+1.14/32 +243} Kf7
{-0.96/39 +222} 14. Rd7+ {+0.81/35 +236} Re7 {-0.96/43 +219} 15. Rxe7+
{+0.81/39 +234} Bxe7 {-0.96/45 +216} 16. a5 {+0.81/42 +231} bxa5
{-0.96/52 +210} 17. Bxa7 {+0.81/47 +228} Bd8 {-0.96/56 +205} 18. Be3
{+0.81/48 +226} Bc7 {-0.96/61 +203} 19. Kg2 {+0.81/45 +223} g6
{-0.96/61 +198} 20. f4 {+0.81/49 +214} f5 {-0.96/63 +192} 21. f3
{+0.81/46 +211} Ke7 {-0.89/52 +191} 22. Kf2 {+0.82/46 +209} Bd8
{-0.96/53 +187} 23. Bd4 {+0.82/48 +206} Kd6 {-0.96/60 +182} 24. Ke3
{+0.82/49 +204} Kc6 {-0.96/62 +174} 25. Kd3 {+0.82/49 +202} Kd6
{-0.96/60 +169} 26. Kc3 {+0.82/46 +199} Kc7 {-0.96/62 +165} 27. Bg7
{+0.82/51 +196} Be7 {-0.96/65 +157} 28. Kd4 {+0.82/52 +193} Ba3
{-0.96/67 +153} 29. Be5+ {+0.82/52 +191} Kb6 {-0.96/60 +150} 30. Kc3
{+0.82/51 +188} Bb4+ {-0.96/59 +145} 31. Kc2 {+0.82/53 +153} Be7
{-0.96/58 +142} 32. Kd3 {+0.82/53 +151} Bh4 {-0.96/57 +140} 33. Kd4
{+0.82/49 +149} Bf2+ {-0.96/58 +137} 34. Kc3 {+0.82/53 +146} Bh4
{-0.96/63 +124} 35. Kd4 {+0.82/50 +144} Bf2+ {-0.96/66 +106} 36. Kc3
{+0.82/55 +141} Bh4 {-0.96/56 +104} 37. Kd3 {+0.82/54 +139} Kc5
{-0.96/59 +102} 38. Bc7 {+0.82/50 +137} Be1 {-0.96/63 +101} 39. Bd8
{+0.82/52 +129} Kc6 {-0.96/64 +99} 40. Be7 {+0.82/47 +115} Bf2
{-0.96/66 +98} 41. Bf6 {+0.82/50 +114} Bc5 {-0.96/60 +94} 42. Bd8
{+0.82/47 +110} Bb4 {-0.96/63 +93} 43. Kd4 {+0.82/52 +109} Kd6
{-0.96/62 +84} 44. Bh4 {+0.82/52 +107} Bc5+ {-0.96/59 +83} 45. Kc3
{+0.82/54 +100} Kc7 {-0.96/56 +79} 46. Bf6 {+0.82/52 +92} Kc6
{-0.96/54 +80} 47. Kd3 {+0.82/49 +91} Bd6 {-0.96/51 +73} 48. Bc3
{+0.82/50 +89} Kb6 {-0.96/54 +72} 49. Bd4+ {+0.82/49 +88} Kc6
{-0.96/53 +62} 50. Be5 {+0.82/48 +86} Be7 {-0.96/45 +62} 51. Bc3
{+0.82/46 +85} Bd8 {-0.96/48 +62} 52. Bh8 {+0.82/47 +76} Bc7 {-0.96/46 +62}
53. Be5 {+0.82/43 +75} Bd8 {-0.96/45 +60} 54. Bc3 {+0.82/42 +73} Bb6
{-0.96/43 +58} 55. Bd4 {+0.75/42 +71} Bc7 {-0.96/38 +58} 56. Bf6
{+0.75/45 +67} Bb6 {-0.96/40 +54} 57. Bd4 {+0.74/47 +66} Bd8 {-0.89/38 +54}
58. Be5 {+0.67/45 +32} Bb6 {-0.95/38 +43} 59. Ke2 {+0.67/50 +32} Bd8
{-0.88/33 +39} 60. Bd4 {+0.67/47 +32} Bc7 {-0.75/32 +40} 61. Bc3
{+0.66/41 +28} Kc5 {-0.53/49 +32} 62. Bd2 {+0.00/34 +27} a4 {+0.00/56 +34}
63. bxa4 {+0.00/38 +27} Kxc4 {+0.00/75 +29} 64. h4 {+0.00/38 +27} Bd6
{+0.00/64 +28} 65. a5 {+0.00/40 +28} Bb8 {+0.00/75 +29} 66. Be1
{+0.00/39 +29} Kb5 {+0.00/74 +30} 67. Ke3 {+0.00/41 +29} Bd6 {+0.00/77 +30}
68. Bd2 {+0.00/42 +21}
{User adjudication} 1/2-1/2[/pgn]
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chessmobile
Posts: 73
Joined: Mon Mar 24, 2014 9:48 am
Location: New Zealand

Re: ThrowBack Tuesday - Nolot 11

Post by chessmobile »

Tested all the positions on my Nokia 8 cellphone loaded with Komodo 11 engine. All positions solved in less than a minute and many times are similar to Stockfish 8 running on the 2016 desktop hardware. The only exception is the position that had Tasc finding d3!! in 150 minutes, Komodo finds Bf5!! As mentioned instead with a +4 score. Obviously both moves win and in response to d3!! It finds Ra2 as a better defensive try but still knows that Black is winning by similar margin.
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User avatar
MikeB
Posts: 4889
Joined: Thu Mar 09, 2006 6:34 am
Location: Pen Argyl, Pennsylvania

Re: ThrowBack Tuesday - Nolot 11

Post by MikeB »

chessmobile wrote:Tested all the positions on my Nokia 8 cellphone loaded with Komodo 11 engine. All positions solved in less than a minute and many times are similar to Stockfish 8 running on the 2016 desktop hardware. The only exception is the position that had Tasc finding d3!! in 150 minutes, Komodo finds Bf5!! As mentioned instead with a +4 score. Obviously both moves win and in response to d3!! It finds Ra2 as a better defensive try but still knows that Black is winning by similar margin.
Todays' cell phones are amazing! Thx for sharing.
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MikeGL
Posts: 1010
Joined: Thu Sep 01, 2011 2:49 pm

Re: ThrowBack Tuesday - Nolot 11

Post by MikeGL »

Thanks for posting your analysis.
MikeB wrote:Nolot#3
[d]r2qk2r/ppp1b1pp/2n1p3/3pP1n1/3P2b1/2PB1NN1/PP4PP/R1BQK2R w KQkq - 0 1
SMP luck on this position
2 cores at 2.0GHz
SF8 dev18011309 32bit, hash 1024 MB
multi-pv: off

1st run 8 seconds
2nd run 34 seconds
3rd run 2 min 30 seconds
4th run 1 min 18 seconds
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flok

Re: ThrowBack Tuesday - Nolot 11

Post by flok »

Code: Select all

folkert@lenovo:~/Projects/QueenBee/tags/v0.9.1_2205/trunk$ ./Embla -B
position fen r3qb1k/1b4p1/p2pr2p/3n4/Pnp1N1N1/6RP/1B3PP1/1B1QR1K1 w - - 0 1
go
info depth 1 seldepth 13 score cp -49 time 22 nodes 312 pv g3f3
info depth 2 seldepth 15 score cp -89 time 46 nodes 1542 pv d1d4 c4c3
info depth 3 seldepth 17 score cp -90 ebf 2.34 time 57 nodes 3247 pv d1d4 c4c3 b2c3 e8a4
info depth 4 seldepth 19 score cp -90 ebf 2.35 time 81 nodes 10063 pv d1d4 c4c3 b2c3 e8a4 c3b4
info depth 5 seldepth 21 score cp -53 ebf 3.03 time 127 nodes 25726 pv d1d4 e8a4 g3f3 c4c3 b2c3
info depth 6 seldepth 21 score cp -53 ebf 2.14 time 214 nodes 56835 pv d1d4 e8a4 g3f3 c4c3 b2c3 h8g8 c3b4
info depth 7 seldepth 25 score cp -57 ebf 2.67 time 518 nodes 168631 pv d1d4 a8c8 g3f3 h6h5 g4e3 c4c3 e3d5 b4d5
info depth 8 seldepth 28 score cp -73 ebf 2.50 time 1038 nodes 363364 pv d1d4 a8c8 g3f3 h6h5 g4e3 d5e3 f2e3 b4d3 b1d3
info depth 9 seldepth 28 score cp -54 ebf 1.85 time 2005 nodes 745723 pv d1d4 a8c8 g3f3 h8g8 e1c1 h6h5 g4e3 d5e3 f2e3 e8a4
info depth 10 seldepth 29 score cp -56 ebf 2.11 time 4264 nodes 1609434 pv d1d4 a8c8 g3f3 h8g8 e1c1 h6h5 g4e3 d5e3 f2e3 d6d5
info depth 11 seldepth 32 score cp -65 ebf 2.14 time 8542 nodes 3364306 pv d1d4 a8c8 g3f3 h6h5 g4e3 c4c3 e4c3 d5c3 f3f8 e8f8 b2c3 b4c6
info depth 12 seldepth 32 score cp -59 ebf 1.53 time 13323 nodes 5379861 pv d1d4 a8c8 g3f3 h8g8 e1c1 h6h5 g4e3 d5e3 f2e3 b7d5 f3f5 e6e4 f5f8
info depth 13 seldepth 34 score cp -92 ebf 2.15 time 32976 nodes 13527763 pv g4h6 c4c3 b2c3 d5c3 g3c3 b7e4 e1e4 e6e4 b1e4 e8e4 h6f7 h8g8 f7d6 a8d8
32s! :D
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