Author: Jon Dart
Date: 15:54:49 10/21/99
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The number of legal moves for a piece is not a good measure of mobility - e.g. a bishop cannot usually move to a location attacked by an enemy pawn. Mobility is pretty cheap to compute if you use bitboards. You can even easily exclude squares attacked by pawns. Pins also reduce mobility and can sometimes be a long-term weakness that the search doesn't evaluate well. Some programs have explicit eval scoring for pins, but this doesn't seem to be very common. --Jon
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