Author: Fabien Letouzey
Date: 03:33:56 06/25/04
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On June 25, 2004 at 06:12:45, Jeff GAZET wrote: >in the search function, when i've got a corresponding hash entry for the current >position, i look as the hash move. And this move is not valid for the current >position (i.e. there is no piece on the from square), how is it possible as >current hash and the hash in the table are the same ? Hi Jeff, Because the hash key, even when 64-bit long, does not uniquely represent reachable chess positions. Although *very* unlikely, two different positions can share the same hash key. However in practice if you encounter any illegal moves during the search, it usually indicates a bug somewhere else. Fabien.
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