Author: Dann Corbit
Date: 23:06:35 07/22/02
Go up one level in this thread
On July 23, 2002 at 01:55:04, Dann Corbit wrote: >On July 23, 2002 at 01:49:18, Russell Reagan wrote: > >>What about always promoting to queen unless there is a reason not to like >>immediate stalemate? Are there any other situations where it is beneficial to >>underpromote where immediate stalemate isn't involved? > >There are many checkemates with knight promotion that would not win or even draw >if otherwise. > >http://www.xs4all.nl/~timkr/chess2/minor.htm >http://www.chessbaseusa.com/T-NOTES/081901.htm >http://www.brianwallchess.com/emails/Underpromotion.shtml Unfortunately, the grand list of underpromotions claimed in the third link above is not really necessary for the optimal checkmate: [D]8/k1P5/8/K7/8/8/8/8 w - - acd 4; acn 9658; acs 0; bm c8=R; ce 32756; dm 6; pv c8=R Kb7 Rc5 Ka7 Rc7+ Ka8 Kb5 Kb8 Kb6 Ka8 Rc8#; Some other interesting underpromotions: [D]RnBqkBnR/PPppppPP/8/8/8/8/ppPPPPpp/rNbQKbNr w - - acd 8; acn 1147058; acs 9; bm hxg8=N; ce 32752; dm 8; pv hxg8=N Bxd2+ Kxd2 f6 Nxf6+ Kf7 g8=Q+ Kxf6 Qg7+ Ke6 Qg6+ Ke5 Rh5+ Kd4 Qg4#; [D]b7/PP6/8/8/7K/6B1/6N1/4R1bk w - - acd 7; acn 1093; acs 0; bm bxa8=N; ce 32762; dm 3; pv bxa8=N Kxg2 Nb6 Bh2 a8=Q#; [D]6bk/PPPP1R1p/3rp2N/4p3/4P3/4K3/3rP3/8 w - - acd 9; acn 6773; acs 0; bm d8=B; ce 32758; dm 5; pv d8=B Rxd8 cxd8=B Rxd8 b8=B Rd3+ exd3 Bxf7 Bxe5#; [D]4K1R1/PP2P3/2k5/3pP3/3B4/6P1/8/8 w - - acd 5; acn 298; acs 0; bm b8=R; ce 32762; dm 3; pv b8=R Kc7 a8=B Kxb8 Kd7#;
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