Author: Robin Smith
Date: 11:09:53 06/09/01
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On June 09, 2001 at 11:19:49, Robert Hyatt wrote: >On June 09, 2001 at 05:18:45, Gian-Carlo Pascutto wrote: > >>On June 08, 2001 at 15:19:09, Robert Hyatt wrote: >> >>>Here is a cute position that occurred between a commercial program and Crafty >>>last week: >>> >>>[D] 8/p4pp1/3rk2p/4p3/2P5/2K4P/P2R1PP1/8 w - - 0 1 >>> >>>Crafty was black and moved the rook to d6, offering a trade. The opponent >>>took it and was happy to do so. Unfortunately, white is lost. White saw >>>the passed pawn and apparently was quite happy. Crafty's static evaluation >>>for this position is -1.0 roughly. >> >>depth=15 1/20 +0.00 1. Rxd6+ Kxd6 2. Kb4 Kc6 3. Ka5 f5 4. h4 Kc5 5. Ka6 Kxc4 6. >>Kxa7 Kb4 7. Kb6 Ka3 8. Kc7 Kxa2 >> >>Am I missing something here? >> >>After the trade I get: >> >>depth=15 1/20 -0.15 2. Kb4 Kc6 3. c5 f5 4. h4 g5 5. h5 g4 6. a3 e4 7. Kc4 f4 8. >>Kd4 g3 9. fxg3 >> >>Not very convincing... >> >>-- >>GCP > > >Apparently I have made more changes in 18.10 than I realized. At depth=15, >my score is way below zero... But the main thing is to avoid Rd6 which simply >loses... You keep saying this "simply loses", but with what evidence? With Crafty 18.08 vs. itself, at both 13 plies/move and 15 plies/move the game is drawn. If it loses at all it certainly isn't simple. Robin
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