Author: Gabor Szots
Date: 00:51:01 05/23/03
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On May 22, 2003 at 20:31:37, Jay Kasick wrote: >WHy is that sometimes when ruffian is playingand it has say a king queen and a >pawn vs king and pawn, it will like sacrifice the queen with some stupid check >next to the king, then run the other pawn for queen promotion? It seems to do >this scenerio a lot... This behaviour is probably due to using an incomplete set of 5-man tablebases. Ruffian (and a lot of other engines, too) is told that he can mate in n moves. But if he promotes a pawn to queen, he may not find the corresponding tablebase, so its score will decrease from 'mate in n' to a certain value which is big but NOT MATE. Therefore he sacrifices the queen in order to arrive at a 4-man position the score of which is again mate. I hope this was clear. The main thing is that 'mate in 30 moves' is better than a score of +20. Regards, Gábor
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