Author: Robert Hyatt
Date: 08:07:53 01/25/01
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On January 25, 2001 at 09:42:16, Brian Richardson wrote: >On January 24, 2001 at 23:39:12, Robert Hyatt wrote: > >>push passed pawns is an extension that is triggered if a passed pawn is pushed >>to the 7th rank only. >>pushpp >>0.00 sum of times(squared)=29373 >>0.25 sum of times(squared)=29385 >>0.50 sum of times(squared)=29336 >>0.75 sum of times(squared)=29360 >>1.00 sum of times(squared)=29375 >>pushing a passed pawn had hardly any effect, but that might be a >>result of the test suite rather than a useless extension. The default >>value for this is also .75 >> >> > >Doesn't Crafty advance pawns in the evaluation anyway (until blocked or >captured, I have not studied the code for some time), and then do its >sophisticated passed pawn eval? This might account for the negligible extension >effect. Just a thought. >Brian No, although if a pawn _is_ passed, the eval will understand if it is unstoppable when the opponent has no pieces except a king that is too far away. However it seems (to me) that pushpp is fairly ineffective... and that recapture is a lemon completely...
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