Author: Sune Larsson
Date: 14:30:58 02/28/01
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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: > >> >> 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... Okey, good test positions are hard to find. Feel free to share your goodies with us! Btw, you gave an interesting Crafty line in the test "Paralyzing the Knight", where you commented that "there may be more than one winning plan here." Crafty's line ended with 11.Kxe5 and I wondered if Crafty can win that position after 11.-Kg4. Any conclusions? Sune
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