Author: Ricardo Gibert
Date: 15:29:09 11/30/99
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On November 30, 1999 at 15:43:23, Howard Exner wrote: >On November 30, 1999 at 12:41:07, Ricardo Gibert wrote: > >>On November 29, 1999 at 17:01:49, Howard Exner wrote: >> >>>5k2/7K/3P3P/8/3bB3/8/8/8 b - - id Rebel Century - Junior 6.0ss; bm d4e5; >>> >>>This position occurred in the recent tournament in Germany. Here Junior played >>>Ke8 and Rebel eventually won. Can the game be saved with the move Be5? >>>eg: 1. ... Be5 2.d7 Bc7. Are endgame table bases needed for this? >> >> >>1...Bc5 >>Or 1...Be5 2.d7 Bc7= >>2.d7 Bb6= 3.Bf5 >>Or 3.Bd5 Ke7 4.Bc6 Kf7 (4...Kf8=) 5.Bd5+ Ke7 >>3...Kf7= >>Neither 3...Ba5? 4.Be6+- Ke7 5.Kg8 Kxe6 (5...Bc3 6.h7) 6.h7 nor 3...Bd8? 4.Be6+- >>Bb6 (4...Bf6 5.Kg6 Ke7 6.d8Q+; 4...Ke7 5.Kg8 Kxe6 6.h7) 5.Kg6 Ke7 6.Bg4 (6.h7? >>Bd4=) 6...Bd4 7.Kh7 Bb6 8.Kg8 are sufficient. > >I wonder if programs can be taught this theme. Most already understand the >rook pawn draw with the bishop of the wrong color. Can they code in something >to cover the above example? - if the defending bishop covers the queening square >of the other pawn(the d7 one in this case) then eval it as a draw(that is when >the defending king reaches the >drawing zone for the rook pawn). Humans spot this easily but can it be >programmed easily? The problem with materially unbalanced, but equal positions for computers is they don't realize they can't make any headway, so they spend all their time churning around (preserving the material edge) until the 50 move rule or 3 fold repetition forces the correct assessment. In some cases, when the computer is several pawns up, they will churn around uselessly until the specter of a 3 fold repetition comes up, then they will sac 1 pawn, then the churning starts anew. Computers do not think schematically. This is what is needed. Berliner calls it chunking, but I see no need to invent a new term when the old term serves as well. In this opposite color bishop ending, the computer sees the draw, but pushes it beyond its horizon with aimless moves.
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