Author: Uri Blass
Date: 12:50:30 11/02/01
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On November 02, 2001 at 15:23:58, Dann Corbit wrote: >This one is simply *WAY* too deep for computers. Besides which, tossing two >pieces along the way will certainly make it harder for computers. A negative >score shows up at ply 12, which is 7 ply beyond the original position, and if we >toss in null move with r=3 that is 12+7+3 = 22 ply. Probably in a few months a >program could solve it. Or Deep Blue could solve it quickly. Deep Blue didn't >use null move. I believe that programs need less than 22 plies The line Rxg6+ Kxg6 Nh4+ Kh6 Qe3+ Kh7 Bd3+ is a tactical line and extensions can help. I also do not see why so you think that nullnull move with r=3 prune 3 plies. It prunes 3 plies when there is no threat and I do not think that it is the case here. The moves of white(at least Rxg6+ Nh4+ Qe3+ Bd3+) are checks and they are certainly noy going to be pruned by null move pruning) I think that the next relevant moves are also not quiet moves so I do not expect null move to be a problem here. I expect top programs on good hardware to solve it in less than 24 hours I am also not sure that Rxg6+ is the only winning move and Junior7 on p200 likes Qe3 with a big score of more than 1.5. New game - Junior 7 r1bq1r2/p2np1k1/3p2pR/3pP3/2pP4/5N2/PP2Q1P1/2KR1B2 w - - 0 1 Analysis by Junior 7: 19.Rh1 dxe5 20.Nxe5 = (-0.13) Depth: 3 00:00:00 19.exd6 exd6 20.Qe3 Rb8 = (0.06) Depth: 3 00:00:00 19.Qe3 dxe5 20.Nxe5 ² (0.31) Depth: 3 00:00:00 19.Qe3 dxe5 20.Qg5 Qb6 21.Nxe5 Nxe5 = (0.16) Depth: 6 00:00:00 10kN 19.Qe3! ² (0.46) Depth: 9 00:00:01 138kN 19.Qe3! dxe5 20.Qg5 Qb6 21.Bd3 Rf6 22.Bxg6 Nf8 23.Be8+ ² (0.57) Depth: 9 00:00:03 394kN 19.Qe3 dxe5 20.Qg5 Qe8 21.dxe5 Rf5 22.Qh4 Qg8 23.Ng5 Rf2 ± (0.84) Depth: 12 00:00:22 2820kN 19.Qe3 dxe5 20.Rxg6+ Kxg6 21.Qg5+ Kf7 22.Qf5+ Kg7 23.Qg4+ Kf6 24.dxe5+ Nxe5 25.Qg5+ Kf7 26.Nxe5+ Ke6 27.Bxc4 Bb7 28.Qg7 ± (1.04) Depth: 14 00:05:04 34924kN 19.Qe3! ± (1.34) Depth: 15 00:11:19 71839kN 19.Qe3 Rh8 20.Ng5 Nb6 21.Rxh8 Qxh8 22.exd6 e6 23.Qe5+ Kg8 24.Be2 Qh6 25.Qf6 Rb8 +- (1.51) Depth: 16 00:26:43 186231kN 19.Qe3 Rh8 20.Ng5 Nb6 21.Rxh8 Qxh8 22.exd6 e6 23.Qe5+ Kg8 24.Be2 a5 25.Qxh8+ Kxh8 26.Rh1+ Kg8 27.Rh6 a4 28.Rxg6+ +- (1.58) Depth: 17 01:10:21 419599kN Uri
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