Author: Robert Hyatt
Date: 14:29:11 10/11/01
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On October 11, 2001 at 15:56:07, Dan Andersson wrote: >No you did not miss anything its only not an easy forced draw. I only wanted to >restate that the check on the third row is the trick that saves blacks bacon >when the king tries to stick to h6. Black has an even better move in the >starting position. 1... Rb1! and a forced draw, and then we get the rook rook >theme after 2. Rc5 Rh1+ 3. Bh5 Rc1!. The winning try for white is to get the >king to f6 and shield it with the bishop on e6-f7. But that is undoable in >general because of the rook trick. > >MvH Dan Andersson I have seen this happen _many_ times in computer chess games. I recall once Bert Gower and I were getting ready for the 1985 ACM event and we were playing games between Cray Blitz (using a Vax 11/780) against his superconstellation, for testing, and in one game, a rook up, we ran into that kind of position where we couldn't take the opponent's rook because it was a stalemate, and we couldn't hide anywhere to negate the threat... That is one of the "easy" for humans positions, _extremely difficult_ for computers positions. Once you reach the desparado position, you _know_ it is drawn. The computer has to search 100 plies to see the 50-move draw unless it is luckier that a repetition occurs first...
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