Author: Robert Hyatt
Date: 06:53:21 01/29/02
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On January 28, 2002 at 23:20:45, James Swafford wrote: > >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 I extend 3/4 ply when a passer reaches the 7th. But that only happens on the ply where it is pushed to the 7th...
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