Author: Francis Monkman
Date: 03:32:47 05/02/99
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On May 01, 1999 at 23:30:58, James Robertson wrote: >On May 01, 1999 at 20:15:54, Francis Monkman wrote: > >>During a game with Genius4 in 95, the following position arose >>after 17 moves by each side: >> >>White: Pa2,b2,c4,e5,f4,g2,h2 Ng3,g5 Bc1 Ra1,f1 Qe2 Kh1 >>Black: Pa7,b7,c6,e6,f7,g7,h6 Na6,b6 (!) Bc5 Ra8,f8 Qe7 Kg8 >> >>White was pleased to find the continuation: >> >>18 f5! hxg5 >>19 f6 gxf6 >>20 Ne4 Rfd8 >>21 Nxf6+ Qxf6 >>22 Rxf6 Nd7 >>23 Bxg5 Nxf6 >>24 Bxf6 Kf8 >>25 Qh5 Ke8 >>26 Rf1 resigns >> >>It would seem obvious that White is winning within a 9-ply search, >>so why doesn't any program find it? (You're of course welcome to >>see for yourself of it's 'legal', but I can't find any get-out for Black.) > >The reason no program can find it is that 9 plies is insufficient to see the >threat. > >My program favored Nfe4 through ply 11. I made the moves 18. f5 hxg6 and let my >program think. After 12 plies and an eternity I got tired of waiting and stopped >it; the pv was 19. h4 g4 20. Qxg4 , with a score of 0.00. > >James After 9 plies (played) Genius4 reckons itself at worse than -5.0 (Black's already had to give up his queen, rather more than a "threat"). How come a 9+ ply search doesn't find this? Francis
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