Author: Colin Frayn
Date: 02:32:16 08/05/00
This position came up in a game I just played between ColChess (Development version) and Sjeng v7.1. [D]8/R7/8/8/7P/6P1/3k2K1/2q5 b - - ColChess, as Black, has to move, having just promoted a pawn to a queen, and then white played a rook move (Ra5-a7). This looks like it should be an easy win for black, but in the game ColChess just moved its pieces around aimlessly and drew by repetition. This annoyed me quite a bit so I tried this position at longer time controls and sure enough it still couldn't see anything. Then I tried it with Crafty and still nothing. Is this one of those positions where it's drawn and humans (if they're better than me) can see it easily but a computer can't? If so then I'd better fix ColChess' evaluation function before release so that it doesn't exchange off (from a stronger position it sac'd its rook to promote the pawn) I can (kind of) see why it might be drawn, but I'd appreciate input either way (maybe from those of you with 5-man TBs.) Cheers, Colin P.S. New version of ColChess is nearing completion. Still unsure whether it is actually stronger than the previous version but it's slightly faster and has some funky new features and a lot of code improvements and bugfixes.
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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