Author: Slater Wold
Date: 21:12:53 03/07/02
Go up one level in this thread
On March 07, 2002 at 22:45:55, Dieter Buerssner wrote: >[D] 5b1k/3R4/5P2/p1rB4/8/8/6K1/8 b - - > >I think, this is an interesting position. It is from an ICC game of Shredder 6 >vs. Yace. Yace moved a4? and lost fast after this. I have looked at some >variations, and the natural looking move a4 indeed seems to be a loss, while Rb5 >probably holds the draw. > >Perhaps I am too naive, but when I watched this game, I first was confident, >that it should be a very easy draw. My (stupid?) reasoning was: A computer will >not lose KRBKR (when he does not see the exceptional win fast). The position >here is KRBPKRBP. The Bs are of opposite color. So, I thought, it should allways >be possible, to sac one B for a P, and have an easy draw. Well, I was totally >wrong, and so was the knowledge I coded into my engine. > >How long does your engine need, to avoid a4? How long does it need, to see a >convincing winning score after a4? (Kg3 is a forced win, other moves perhaps, >too). > >Regards, >Dieter Well, since you were playing Shredder, I'll tell you what it thought: W,S - Shredder Paderborn 5b1k/3R4/5P2/p1rB4/8/8/6K1/8 b - - 0 1 Analysis by Shredder Paderborn: 1...Rxd5 2.Rxd5 Bc5 +- (3.41) Depth: 1/2 00:00:00 1...a4 ± (0.84) Depth: 1/2 00:00:00 1...a4 2.Kf3 Ra5 = (0.14) Depth: 1/2 00:00:00 1...a4 2.Kf3 Ra5 = (0.14) Depth: 1/2 00:00:00 1...a4 2.Kf3 Ra5 = (0.14) Depth: 1/2 00:00:00 1...a4 2.Kf3 Ra5 = (0.14) Depth: 1/2 00:00:00 1...a4 2.Kf3 Ra5 = (0.14) Depth: 4/8 00:00:00 1...a4 2.Kf3 Ra5 = (0.14) Depth: 4/8 00:00:00 1...a4 2.Kf3 Ra5 = (0.14) Depth: 4/8 00:00:00 1...a4 2.Kf3 a3 3.Ke2 ² (0.44) Depth: 4/8 00:00:00 1...a4 2.Kf3 Rc3+ 3.Ke4 Rc2 ² (0.63) Depth: 4/8 00:00:00 1...Rc2+ 2.Kf3 Rc3+ 3.Ke2 Rc1 4.Rd8 ² (0.62) Depth: 4/8 00:00:00 1...Rc2+ 2.Kf3 Rc3+ 3.Ke2 Rc1 4.Rd8 ² (0.62) Depth: 4/8 00:00:00 1...Rc2+ 2.Kf3 Rc3+ 3.Ke2 Rc1 4.Ra7 Bg7 ± (0.87) Depth: 5/10 00:00:00 1...Rc2+ 2.Kf3 Rc8 3.Ra7 a4 4.Ke4 ± (1.20) Depth: 5/10 00:00:00 1...Rc8 2.Bb3 a4 3.Bxa4 Bb4 ± (1.16) Depth: 5/10 00:00:00 1...Rc8 2.Ra7 Bb4 3.Kf3 Bc3 ± (0.81) Depth: 5/10 00:00:00 1...Rc8 2.Ra7 Rc5 3.Be6 Bd6 ± (0.71) Depth: 5/10 00:00:00 1...Rb5 2.Ba2 a4 3.Kf3 Rb2 ² (0.69) Depth: 5/10 00:00:00 1...Rb5 2.Kf3 Rb6 3.f7 Ra6 ² (0.69) Depth: 5/10 00:00:00 1...Rb5 2.Rd8 Kh7 3.Rxf8 Rxd5 4.Re8 ± (1.00) Depth: 6/12 00:00:00 1...Rb5 2.Rd8 Kh7 3.Rxf8 Rb2+ 4.Kf3 Rb6 5.Ke4 +- (1.53) Depth: 6/12 00:00:00 1...Rb5 2.Rd8 Kh7 3.Rxf8 Rxd5 4.Ra8 +- (1.76) Depth: 6/12 00:00:00 1...a4 2.Rd8 Kh7 3.Rxf8 Rxd5 4.Ra8 a3 5.Rxa3 +- (1.67) Depth: 6/12 00:00:00 1...a4 2.Rd8 Kh7 3.Rxf8 Rxd5 4.Ra8 a3 5.Rxa3 +- (1.67) Depth: 6/12 00:00:00 1...Rc2+ 2.Kh3 Rc3+ 3.Kg4 Rd3 4.Kf5 Rd2 5.Ke6 ± (1.30) Depth: 6/12 00:00:00 1...Rc2+ 2.Kf3 Rc1 3.f7 Rf1+ 4.Ke2 Rf6 5.Ra7 ± (0.95) Depth: 6/12 00:00:00 1...Rc2+ 2.Kg3 Rc8 3.Kf4 Bb4 4.Ke5 a4 ± (0.94) Depth: 6/12 00:00:00 1...Rc8 2.Be6 a4 3.Rd4 Rc2+ 4.Kf3 Bc5 5.Rxa4 ± (0.93) Depth: 6/12 00:00:00 1...Rc8 2.Kf3 Ba3 3.Ke3 Re8+ 4.Kd3 Rf8 ± (0.85) Depth: 6/12 00:00:00 1...Rc8 2.Be4 Bd6 3.Rxd6 Rg8+ 4.Kf3 Re8 5.f7 Rxe4 ± (1.10) Depth: 7/14 00:00:00 132kN, tb=237 1...Rc8 2.Be4 Rc7 3.Rxc7 Be7 +- (1.60) Depth: 7/14 00:00:00 133kN, tb=241 1...Rc8 2.Be4 Kg8 3.Rh7 Bd6 4.f7+ Kf8 5.Rh8+ Ke7 6.Rxc8 Kxf7 +- (4.11) Depth: 7/14 00:00:01 161kN, tb=361 1...Rc2+ 2.Kg3 Rc8 3.Kf4 Bb4 4.f7 a4 5.f8N +- (4.10) Depth: 7/14 00:00:01 181kN, tb=441 1...Rc2+ 2.Kg3 Rc8 3.Bc4 Rxc4 4.Rc7 Rxc7 5.Kf4 +- (3.75) Depth: 7/14 00:00:01 189kN, tb=441 1...Rc2+ 2.Kg3 Rc8 3.Kf4 Bb4 4.Ke5 a4 5.Ke6 ± (0.97) Depth: 7/14 00:00:01 228kN, tb=472 1...a4 2.Rd8 Kh7 3.f7 ± (0.96) Depth: 7/14 00:00:01 251kN, tb=622 1...a4 2.Kf3 Rc1 3.Rf7 Bb4 4.Re7 Bxe7 5.fxe7 Re1 6.e8N ² (0.62) Depth: 7/14 00:00:01 270kN, tb=653 1...Rb5 2.Rd8 Kh7 3.Be6 Rb6 4.Rd7+ Kh6 5.Kg1 ² (0.61) Depth: 7/14 00:00:02 317kN, tb=857 1...Rb5 2.Rd8 Kh7 3.Kf3 Rc5 4.f7 Rc4 ² (0.61) Depth: 7/14 00:00:02 320kN, tb=857 1...Rb5 2.Kf3 Rb1 3.Ke4 Re1+ 4.Kd4 Rd1+ 5.Kc3 Rf1 6.f7 ± (0.84) Depth: 8/16 00:00:03 460kN, tb=1509 1...a4 2.Kf3 Rc1 3.Rf7 Bb4 4.Ke2 ± (0.83) Depth: 8/16 00:00:03 581kN, tb=1782 1...a4 2.Kf3 Rc1 3.Ke4 Bh6 ± (0.83) Depth: 8/16 00:00:03 605kN, tb=1811 1...a4 2.Kf3 Rc8 3.Ke4 Bc5 4.Kd3 a3 5.Ba2 Rf8 6.f7 ² (0.66) Depth: 9/18 00:00:05 910kN, tb=2587 1...Rb5 2.Kf3 Rb6 3.Rf7 Bh6 4.Be6 Rxe6 5.Ra7 Rxf6+ 6.Kg3 ² (0.65) Depth: 9/18 00:00:06 1119kN, tb=3537 1...Rb5 2.Kf3 Rb6 3.Rf7 Bc5 4.Ke4 Ra6 5.Ba2 Kg8 ² (0.54) Depth: 9/18 00:00:06 1237kN, tb=3723 1...Rb5 2.Be4 Kg8 3.Bh7+ Kh8 4.Bd3 Rg5+ 5.Kf3 Bc5 6.Kf4 Rg2 7.Ke5 ² (0.70) Depth: 10/20 00:00:09 1954kN, tb=4863 1...Rb5 2.Be4 Kg8 3.Bh7+ Kh8 4.Bd3 Rg5+ 5.Kf3 Bc5 6.Bc2 Kg8 7.f7+ ² (0.60) Depth: 11/22 00:00:11 3384kN, tb=6439 1...Rb5 2.Be4 Kg8 3.Bh7+ Kh8 4.Bd3 Rg5+ 5.Kf3 Bb4 6.Bc2 Bc3 7.Rh7+ Kg8 8.f7+ Kf8 ² (0.61) Depth: 12/24 00:00:16 5997kN, tb=8381 1...Rb5 2.Be4 Rh5 3.Ra7 Rg5+ 4.Kf3 Bb4 5.Bd3 Bc3 6.f7 Kg7 7.Bc4 Bd4 8.Ra8 Rf5+ 9.Ke4 ² (0.55) Depth: 13/25 00:00:35 19541kN, tb=11756 1...Rb5 2.Be4 Rh5 3.Rd8 Kg8 4.Bd5+ Kh7 5.Bf3 Rg5+ 6.Kh3 Rg8 7.Be4+ Kh6 8.Ra8 Kg5 9.f7 Rh8+ ² (0.56) Depth: 14/26 00:00:54 31368kN, tb=17226 1...Rb5 2.Be4 Kg8 3.Bh7+ Kh8 4.Bd3 Rg5+ 5.Kf3 Bb4 6.Rd8+ Rg8 7.Rd4 Be1 8.Re4 ± (0.72) Depth: 15/27 00:01:33 54418kN, tb=36282 1...Rb5 2.Be4 Kg8 3.Bh7+ Kh8 4.Bd3 Rg5+ 5.Kf3 Bb4 6.Rd8+ Rg8 7.Rd4 Be1 8.Re4 ± (0.76) Depth: 16/28 00:03:19 124621kN, tb=75263 (W, 07.03.2002)
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