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Subject: Endgame Test Position

Author: Dieter Buerssner

Date: 19:45:55 03/07/02


[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



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