Author: Don Dailey
Date: 17:14:25 01/29/98
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On January 29, 1998 at 18:24:19, Peter Kappler wrote: >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. This is a very popular and beautiful study. But it was beautiful because of the underpromotion. There was no cook involved and the underpromotion was the whole point of the position. I remember seeing another beautiful composed study that involved underpromoting to each piece type and it was correct in the best move and best defense sense. I would love to see it again if anyone has it somewhere. Mark Leski and IM showed it to me once. - Don
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