Author: Mike Byrne
Date: 16:02:12 12/26/03
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On December 26, 2003 at 18:10:51, Jim Monaghan wrote: >In this study: > >[D]8/5B2/4P3/8/8/4k1p1/6P1/3b3K w - - 0 1 > >There are stalemate and underpromotion themes. >First off, 1.Kg1? allows 1...Bb3 pinning the e-pawn. >Also, 1.e7? Kf2 2.e8=Q Bf3 3.Bd5 Bxg2+ 4.Bxg2 stalemate. >The right way is 1.Be8! Kf2 2.Bc6 Be2 3.e7 Bf1 4.e8=N! and White wins by >bringing his knight to e4. > >My question is that both Ruffian and Crafty perfer 4.e8=B? both giving high >scores. Yace gets it right with the knight underpromotion. Obviously with >4.e8=B, 4...Bxg2+ is a draw. I don't have tablebases installed on this PC. >Anyone know what's going on? Why no contempt factor for bishops of the same >colour? > >Jim Which crafty version are you using? Crafty 19.08 SE (available from for free by email with the word "include" in the subject heading) sees your winning line in a few (6) seconds on my dual 1.7 Ghz Crafty19.08 SE UCI 2 MB: 8 00:00 2.46 1.e7 Ba4 2.Kg1 Bd7 3.Bg6 Be6 4.Bc2 Kf4 9 00:00 1.49 1.e7 Kf4 2.e8Q Kg4 3.Qd7+ Kf4 4.Qxd1 Kg5 5.Qf3 10 00:00 1.73 1.e7 Kf4 2.e8Q Kg5 3.Qd8+ Kf4 4.Qb8+ Kg4 11 00:00 2.13 1.e7 11 00:00 2.30 1.e7 Kf2 2.Bd5 Ba4 3.Ba8 Be8 4.Bf3 Ke3 5.Kg1 Kf4 6.Bd5 12 00:01 2.23 1.e7 Kf2 2.Bd5 Ba4 3.Ba8 Be8 4.Bf3 Ke3 5.Kg1 Kf4 6.Bd5 Kg5 13 00:01 2.25 1.e7 Kf2 2.Bd5 Ba4 3.Ba8 Be8 4.Bf3 Ke3 5.Kg1 Kf4 6.Bd5 Ke5 7.Bc4 14 00:02 2.20 1.e7 Kf2 2.Bd5 Ba4 3.Ba8 Be8 4.Bf3 Ke3 5.Kg1 Kf4 6.Bd5 Ke5 7.Bf3 Kf4 15 00:03 1.30 1.e7 Kf2 2.Bd5 Ba4 3.Bf3 Be8 4.Bb7 Ke3 5.Kg1 Kf4 6.Kf1 Ke5 7.Ke2 Kd6 8.Kf3 15 00:04 1.37 1.Kg1 Bb3 2.Bg8 Ba4 3.Bh7 Kf4 4.Bd3 Bb3 5.e7 Ke5 6.Kf1 Kf6 7.e8N+ Kg5 8.Nd6 16 00:05 0.05 1.Kg1 Bb3 2.Bg8 Ba4 3.Bh7 Kf4 4.Bd3 Ke5 5.Bc4 Kd6 6.Ba2 Bc6 7.Bb3 Bd7 8.exd7 Kxd7 16 00:06 1.77 1.Be8 16 00:11 1.76 1.Be8 17 00:13 1.43 1.Be8 Kf2 2.Bc6 Be2 3.e7 Bf1 4.e8N Ke3 5.Bf3 Bd3 6.Nf6 Bg6 7.Kg1 Kf4 8.Nd5+ Ke5 9.Ne7 18 00:19 1.35 1.Be8 Kf2 2.Bc6 Be2 3.e7 Bf1 4.e8N Be2 5.Be4 Ke3 6.Nd6 Kf2 7.Bf5 Ke3 8.Kg1 Kf4 9.Be4 Ke3 19 00:26 1.37 1.Be8 Kf2 2.Bc6 Be2 3.e7 Bf1 4.e8N Be2 5.Nf6 Ke3 6.Nd5+ Kd4 7.Nf4 Bd1 8.Kg1 Ke5 9.Nd3+ Ke6 10.Nc5+ Kf5 20 00:27 1.30 1.Be8 Kf2 2.Bc6 Be2 3.e7 Bf1 4.e8N Be2 5.Nf6 Ke3 6.Be8 Kf4 7.Bh5 Bc4 8.Bf3 Kg5 9.Nh5 Kh4 10.Kg1 Bd5
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