Author: Bruce Moreland
Date: 09:30:01 05/12/98
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On May 12, 1998 at 05:04:32, Roland Pfister wrote: > >On May 12, 1998 at 03:24:54, Bruce Moreland wrote: > >> >>On May 12, 1998 at 01:17:08, Kai Skibbe wrote: >> >> >>>WKh3, Rh6, Pg3,g2 >>>BKc5, Rb6, Ph7 >>>White to move >> >>>Why is this position so difficult for programs ? >> >>Thanks for this position, it was a lot of fun. >> >>The reason it is hard is that after the rook exchange, if white just >>goes straight for the pawns, it is a draw. This K+P ending is trickier >>than it looks. >> >>1. Rxb6 Kxb6 2. Kh4 is drawn after 2. ... Kc5. >> >>1. Rxb6 Kxb6 2. Kg5 wins I believe, but 2. ... Kc5 3. Kg5? is drawn > >You believe? I thought you had a tablebase for that ending. No. The only database that would help here is KP vs K. I don't have KP vs KP, because of the en-passant problem, which means I also don't have KPP vs KP. I had a typo above, I meant to type 2. Kg4, since 2. Kg5 isn't legal. >When I entered Rxb6 Kxb6 the evalution stays at 2.x. >PV at iteration 22: 2.Kg4 Kc5 3.Kf4 Kd6 4.g4 Kd5 5.g5 Ke6 (2.09) >after 15 minutes. >What does your tablebase say to my PV? I don't have a database, but we are in agreement. bruce
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