Author: Matthew White
Date: 00:45:42 07/11/03
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On July 10, 2003 at 23:27:08, Mike Hood wrote: >On July 10, 2003 at 15:04:25, Matthew White wrote: > >>Underpromotion position from >>Chan - Depasquale >>Laoag 1985 >>[D]6k1/8/4p3/4Pp1p/5P1P/3Rn2K/6p1/8 b - - >> >>The only winning move is 1...g1=B! >> >>For example, 1...g1=Q 2. Rd8+ Kh7 (or Kf7 Rd7+ Ke8 Rd8+ etc) 3. Rh8+ Kxh8 (or >>Kg7 Rg8+ Kxg8 stalemate) stalemate. >> >>Most engines see this, though it takes up to 8 ply or so most of the time... >>wbNimzo2000 doesn't seem to be able to find the correct move. Nimzo8, OTOH, >>does... Guess he found the bug :). Maybe it will help you find a bug too... >> >>Regards, >>Matt > >Very nice, Matt... underpromotion to Bishop must be the rarest underpromotion. >Do you know if underpromotion to a Bishop has ever occurred in top level chess? >Or is it just a matter for concocted positions in textbooks? Thanks, I believe that this position was actually a real on from a game. Chan and Depasquale are both rated around 2300... This page has several examples of underpromotion to bishop in real games: http://www.xs4all.nl/~timkr/chess2/minor.htm Matt
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