Author: Bruce Moreland
Date: 00:23:53 01/24/01
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On January 23, 2001 at 17:48:45, Vincent Diepeveen wrote: >On January 22, 2001 at 20:01:22, Bruce Moreland wrote: > >>[D]r4r1k/4bppb/2n1p2p/p1n1P3/1p1p1BNP/3P1NP1/qP2QPB1/2RR2K1 w - - 0 1 >> >>After a trillion nodes (19 plies) my program can't solve this. >> >>It wants to play Nxh6 with a dubious +1 score (up an exchange for a pawn, and >>probably losing a pawn), but it can't find the key, which is Ng5. >> >>If this is solvable, it is much harder than many of the others. >> >>bruce > >Diep never solved it so far. Very important for this position >is extending on mate thread which the current diep version is >not always doing. > >For sure white must give up 2 pieces first before he has any chance >of mating black. after ng5 real soon nf6 sacrafice has to follow. > >After some moves done i get very soon a reasonable score for Ng5 like >-0.30 or something. > >However in the root position after some time diep says white wins with >Rxc5 and not Ng5 and every ply score goes up for Rc5 from -0.0x to +1.xx >after a few tens of minutes, so diep will most likely go for Rxc5 for >a long period of time. > >Definitely Ng5 is winning, not a hair on my head is doubting that. >This problem IS a tactical shot for sure, but a very deep one... > >What time do you need for #8 Bruce? >Diep nowadays is lucky with extensions and finds it >after 2 and a half minute with a 2.xx score. > >Greetings, >Vincent 2 hours with +1 on the quad Xeon 450. bruce
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