Author: José Antônio Fabiano Mendes
Date: 11:25:08 04/25/00
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On April 24, 2000 at 23:15:23, Robert Hyatt wrote: >On April 24, 2000 at 22:34:28, Dann Corbit wrote: > >>On April 23, 2000 at 18:13:42, Robert Hyatt wrote: >> >>>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.. >> >>Are there any cases where you would promote to bishop or rook to achieve >>stalemate for yourself? (e.g. you are far behind in material (say down two >>queens or more), and the only legal move is the pawn promotion or something of >>that nature) > > >Sounds hard.. but I'll bet there is a problem composer out there that might >construct such a position... http://www.xs4all.nl/~timkr/chess2/minor.htm [comprehensive!]
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