Author: José Carlos
Date: 00:04:44 03/01/01
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On February 28, 2001 at 16:41:49, Robert Hyatt wrote: >On February 28, 2001 at 16:23:35, Sune Larsson wrote: > >> >> [D]8/5b2/p2k4/1p1p1p1p/1P1K1P1P/2P1PB2/8/8 w - - 0 1 >> >> >> This is one of Averbakh's positions from 1954. >> It's a typical winning position in a good versus bad bishop ending. >> The black pawns on h5, f5, d5 and a6 are vulnerable and curtail the >> movements of the black bishop. To seal black's fate, all white need to do >> is lose a move. That is - repeat the initial position with black to move. >> This may be accomplished as follows: >> >> 1.Be2 Be8 [1.-Bg6 2.Bd3 Bh7 3.Bf1 leads to instant zugzwang, be it after >> 3.-Bg6 4.Bg2 Bf7 5.Bf3 or after 3.-Bg8 4.Be2 Bf7 5.Bf3] >> >> 2.Bd3 Bg6 3.Bc2 Bh7 4.Bb3! Bg8 5.Bd1 Bf7 6.Bf3! and so on >> >> >> Test: The above position is won for white so your program should be able >> to win it. The evals should differ distinctly between white and black. >> >> Sune > > >This is a bad position to test. It doesn't test knowledge at all. I just >modified crafty to use a pure material-only scoring, at at depth=12, after a >second or so, it sees winning a pawn. IE this isn't about knowledge, it is >about search, and as a result, _any_ program should handle this correctly >on almost any hardware... Maybe the good thing of this position is to check static eval. So that the test could be: "the program should eval this position as very good for white because of the bishops and the pawn structure". José C.
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