Author: Peter McKenzie
Date: 19:45:14 05/24/00
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On May 24, 2000 at 19:51:35, Roberto Waldteufel wrote: >I have noticed a weakness in my program in situations where there are advanced >passed pawns, but often the promotion is not seen before it is already too late >to stop, or else can only be stopped by sacrifice of material. Usually the >program has missed a chance to stop the pawn much more cheaply, being distracted >by some small material gain on the other side of the board, or else pushing the >promotion beyond the search horizon by means of a series of checks from which >the oponent can ultimately escape safely. Does anyone extend their searches for >passed pawn pushes? If so, how is the extension triggered - does it depend on >the rank of the pawn, the king position, and/or the currant remaining search >depth? At present I consider pawn promotions in the qsearch (depth<=0) and I >extend 1 ply for pawn pushes to the seventh rank at frontier nodes (depth=1), I'm not confident that this type of extension (only at frontier nodes) is very useful. Lots of dangerous variations involve the passer push further up the tree. I think I extend for all pawn pushes to the 7th in my program. >so the oponent cannot stand pat without giving the pawn a chance to promote, but >I do no other pawn-triggered extensions at all. I think that pushes to the >sixth rank probably should be extended as well, but to ensure that promotion >occurs before standing pat this would need a lot of extra full-width plies. Any >suggestions? > >Best wishes, > >Roberto
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