Author: Bruce Moreland
Date: 10:14:23 05/28/00
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On May 28, 2000 at 08:31:45, Vincent Lejeune wrote: >On May 27, 2000 at 19:47:12, Bruce Moreland wrote: > >>On May 27, 2000 at 08:47:17, Terje Vagle wrote: >> >>>Can your program find ..sf5+!! >>> >> >>[D] 8/8/3nk3/8/p5PB/4K3/P7/8 b - - >> >>Someone has said this is wrong. If it isn't wrong, it is still very hard >>because white can get to a7 with his K before black gets to the corner. > >Your overlook that white have to take the black pawn before pushing his own pawn >to the 8th rank ;) Nope. White has to take it in order to queen, but white doesn't have to take it in order to get the king to a7. The resulting position is drawn, but the computer doesn't know this. The way to do a wrong rook pawn heuristic with KBP v K is you look to see if the black king is on a7/b7/a8/b8. If this is the case, black can't lose. If you add a black pawn somewhere on the board, the situation should be the same, unless in some cases when the pawn is on the b-file. So I wasn't talking about what white has to do to try to win, I was talking about what has to occur on the board before black can safely assume a draw, given that black is evaluating the important endpoints in a few microseconds each. bruce
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