Author: Robert Hyatt
Date: 17:23:38 05/30/02
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On May 30, 2002 at 16:50:37, Jesper Antonsson wrote: >By the way, would it be really hard to write eval that finds such locked >positions and evaluates them as draws? I get such positions every once in while, >especially in my minds "search tree", so it should be worthwile to evaluate them >correctly. With care, one should be able to make such eval somewhat lazy. > >/Jesper It isn't hard to do. The problem is that it is a fairly "slow" operation to verify that no pawn can move at all. If it were just the case where all pawns are "rammed" it is trivial in bitmaps. shift all white pawns forward one rank, OR them with all black pawns, and if the POPCNT() result is the same as the number of white pawns, they are all blocked. But there are special cases such as pawns at a4, b3 c4 (white) and a5, b6, c5 for black. Factoring in the really useful cases makes it more time-consuming.
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