Author: James Swafford
Date: 20:20:45 01/28/02
Does anybody do this? I just implemented a passed pawn extension that extends the depth by 1 if the move was a pawn move to the sixth or seventh rank, and that pawn is not blocked by a pawn of the opposite color. The results are pretty disappointing. It really blew up my search. I decided to modify the implementation by saying only looking for pawn pushes to the seventh rank, and it still can blow up pretty bad. Obviously most over the board positions would not trigger this extension, but there are some that would blow up the search like mad. One thought I had is to use a fractional extension scheme. That may help, but I'd like to know if anybody else does this extension, and what mechanisms they have in place to keep the search bloat under control. It's interesting to note that Bruce lists five different extensions on his (excellent) web page; he hasn't actually written about any of them yet, but passed pawn isn't even listed. Hmm... Any ideas or comments? -- James
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