Author: John Merlino
Date: 13:50:19 02/28/01
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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 No problem for CM8000 (or any decent engine, I suspect): Time Depth Score Positions Moves 0:00 7/8 0.47 15335 1. Be2 Bg6 2. Bd1 Be8 3. Bc2 Bd7 4. Bd3 Be6 0:00 9/10 0.56 71308 1. Be2 Bg6 2. Bd3 Bh7 3. Bc2 Bg6 4. Bb1 Bh7 5. Bd3 Bg6 0:01 10/11 0.56 142936 1. Be2 Bg6 2. Bd3 Bh7 3. Bf1 Bg6 4. Bg2 Bf7 5. Bf3 Kc6 6. Ke5 0:04 11/12 1.55 358648 1. Be2 Bg6 2. Bd3 Bh7 3. Bf1 Bg6 4. Bg2 Bf7 5. Bf3 Be8 6. Bxd5 Bg6 7. e4 fxe4 8. Bxe4 0:07 12/13 1.55 661440 1. Be2 Bg6 2. Bd3 Bh7 3. Bf1 Bg6 4. Bg2 Bf7 5. Bf3 Be8 6. Bxd5 Bg6 7. e4 fxe4 8. Bxe4 0:13 13/14 1.79 1323641 1. Be2 Bg6 2. Bd3 Bh7 3. Bf1 Bg6 4. Bg2 Bf7 5. Bf3 Kc6 6. Ke5 Bg6 7. Bxd5+ Kb6 8. e4 fxe4 9. Bxe4 0:22 14/15 1.87 2471415 1. Be2 Bg6 2. Bd3 Bh7 3. Bf1 Bg6 4. Bg2 Bf7 5. Bf3 Bg6 6. Bxd5 Kc7 7. Ke5 Kd8 8. e4 fxe4 9. Bxe4 0:43 15/16 2.30 4758496 1. Be2 Bg6 2. Bd3 Bh7 3. Bf1 Bg6 4. Bg2 Bf7 5. Bf3 Be6 6. Bxh5 Bd7 7. Bf3 Bc6 8. h5 Ke6 9. h6 1:19 16/17 2.43 8636105 1. Be2 Bg6 2. Bd3 Bh7 3. Bf1 Bg6 4. Bg2 Bf7 5. Bf3 Be6 6. Bxh5 Bg8 7. Bf3 Bf7 8. h5 Ke7 9. h6 2:27 17/18 2.66 15998001 1. Be2 Bg6 2. Bd3 Bh7 3. Bf1 Bg6 4. Bg2 Bf7 5. Bf3 Bg6 6. Bxd5 Be8 7. Bf3 Bf7 8. Bb7 Be6 9. Bxa6 Kc6 jm
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