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Subject: Passed Pawns and Extensions?

Author: William Bryant

Date: 07:19:06 08/21/99


How do programs evaluate passed pawns in the search to trigger a passed pawn
push extenison.  I noted in Crafty's code that it check to see if a pawn push is
a passed pawn, and the pawn won't be immediately captured, and then searches
deeper.

What stratigies do programs use to keep track of passed pawns?

Are these updated in makemove and takeback functions or do you call an
evaluate-for-passed-pawns function in the search to see if things have changed
since the last pawn move?

What gains in the search does a passed pawn push extension provide?

Thanks in a advance.

William
wbryant@ix.netcom.com



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