Author: John Merlino
Date: 20:37:16 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 So much for the axiom "passed pawns must be pushed!" Chessmaster 8000 (PIII-733) says: Time Depth Score Positions Moves 0:00 2/3 0.83 790 1...Rc1 2.Rd8 Rc2+ 3.Kf3 0:00 2/3 0.34 930 1...a4 2.Rd8 Rc2+ 3.Kf3 0:00 3/4 0.37 2399 1...a4 2.Rd8 Kh7 3.Be4+ Kg8 4.Ra8 0:00 4/5 0.33 12911 1...a4 2.Rd8 Kh7 3.Kf3 Bg7 4.fxg7 Kxg7 0:00 5/6 0.26 60254 1...a4 2.Rd8 Kh7 3.Kf3 a3 4.Ke4 Bh6 0:03 6/7 0.29 244451 1...a4 2.Rd8 Kh7 3.Kf3 a3 4.Ke4 Bg7 5.fxg7 Kxg7 0:12 7/8 0.62 1086622 1...a4 2.Be4 Kg8 3.Bh7+ Kh8 4.Bb1 Kg8 5.Ba2+ Kh8 6.Rd8 Rc2+ 7.Kf3 Rxa2 8.Rxf8+ Kh7 9.Ra8 Kg6 0:22 7/8 0.45 2115956 1...Rb5 2.Rd8 Kh7 3.Kf3 Kg6 4.Ke4 Bb4 5.Bc4 Rf5 0:47 8/9 0.45 4359039 1...Rb5 2.Rd8 Kh7 3.Kf3 Kg6 4.Ke4 Bb4 5.Bc4 Rf5 1:47 9/10 0.43 10276493 1...Rb5 2.Be4 Rh5 3.Rd8 Kg8 4.Bd5+ Kh7 5.Ba2 Rg5+ 6.Kh3 Bg7 7.Bb1+ Kh6 8.f7 Rh5+ 9.Kg4 Rg5+ 10.Kf4 5:30 10/11 0.56 31689695 1...Rb5 2.Rd8 Kh7 3.Bc6 Rg5+ 4.Kh3 Rc5 5.Be4+ Kg8 6.Bd5+ Kh7 7.Kg4 a4 8.Kf5 a3 9.Ke6 jm
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