Author: Joe Pechie
Date: 19:59:36 03/07/02
Go up one level in this thread
On March 07, 2002 at 22:50:05, Robert Hyatt wrote: >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 TIger 14.0 finds Rb5 quick. [+0.40] d=8 1...a4 2.Kf3 Rc8 3.Ke2 Rc2 4.Kd3 Rf2 5.Rf7 Bd6 (0:00.00) [+0.62] d=9 1...a4 2.Rd8 Kh7 3.Kf3 Kg6 4.Ke4 Bh6 5.f7 Rxd5 6.Kxd5 Kxf7 (0:00.01) [+0.99] d=10 1...a4 2.Kf3 Rc1 3.Kf4 Rf1 4.Kg5 Re1 5.Kg6 Rg1 6.Kf7 Bc5 7.Rc7 (0:00.02) [+0.78] d=10 1...Rb5 2.Rd8 Kh7 3.Kf3 Kg6 4.Ke4 Bh6 5.f7 Rxd5 6.Rxd5 Kxf7 7.Rxa5 (0:00.06) [+0.68] d=11 1...Rb5 2.Rd8 Kh7 3.Kf3 Kg6 4.Ke4 Bb4 5.f7 Rxd5 6.Kxd5 Kxf7 7.Ke5 Bc3 8.Kd5 (0:00.10) [+0.72] d=12 1...Rb5 2.Rd8 Kh7 3.Kf3 Kg6 4.Ke4 Bb4 5.f7 Rxd5 6.Kxd5 Kxf7 7.Ra8 Bc3 8.Ra6 (0:00.16) [+0.82] d=13 1...Rb5 2.Rd8 Kh7 3.Kf3 Kg6 4.Ke4 Bb4 5.f7 Rxd5 6.Rxd5 Kxf7 7.Kf5 Ke7 8.Re5 Kd6 (0:00.27) [+0.86] d=14 1...Rb5 2.Rd8 Kh7 3.Kf3 Kg6 4.Ke4 Bb4 5.f7 Rxd5 6.Rxd5 Kxf7 7.Kf5 Ke7 8.Re5 Kd6 9.Rb5 Bc3 (0:00.52)
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