Author: Peter Kappler
Date: 15:24:19 01/29/98
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On January 29, 1998 at 17:57:00, David Fotland wrote: >I know that some positions require underpromoting a pawn to a knight, >but are there any that win with an underpromote to a bishop or rook? > >I'd like to limit the move generator to just queen and knight >promotions. > Underpromoting to rook or bishop is so incredibly rare that you can probably safely ignore it. On the other hand, I think any speedup you get from this will be negligible, especially since the variations with the underpromotions will get cutoff quickly. I'd love to see an example from a real game where a promotion to bishop or rook occurred (and was necessary). Can anybody out there produce one? I do know of a study by Saavedra (sp?) which was cooked by an underpromotion to a rook. (It's a rook versus pawn position, where the pawn can't be stopped from promoting, but if it is promoted to a queen, black has an amazing stalemate resource. However, promoting to a rook avoids the stalemate, and leads to a forced mate in 2.) I'll find the position tonight and post it - it's a beautiful study. --Peter
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