Author: Robert Hyatt
Date: 15:13:42 04/23/00
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On April 23, 2000 at 17:15:52, Michael Fuhrmann wrote: >Why would a program ever underpromote to a rook? Saw Crafty do this recently. >(In this particular case, it had no impact on the outcome of the game.) 1. it is necessary at times. IE if you promote to queen, you stalemate your opponent. if you promote to rook, you can still win without stalemating him. 2. In the case of chess engines, it is pretty common to see this. The most common reason is that the =R is not a check, when the =Q is a check, or the rook allows fewer checks later in the tree. So by promoting to a rook, it avoids some tactic that it really can't avoid... IE this is a horizon effect situation..
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