Author: Robert Hyatt
Date: 06:19:45 01/15/98
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On January 15, 1998 at 08:53:27, Amir Ban wrote: >On January 15, 1998 at 08:01:10, Robert Hyatt wrote: > >>On January 15, 1998 at 05:35:18, Amir Ban wrote: >> >>> >>>Maybe we can break the problem into two easier parts: >>> >>>- Who sees a plus score for Qxb3 ? >>>- Who sees a draw score for only shuffling the queen ? >>> >>>Amir >> >> >>I disagree. I have seen Cray Blitz and Crafty win many such positions. >>It >>takes a lot of time, but being ahead +12 is *not* going to draw if the >>program >>understands the 50 move rule and repetitions. IE sooner or later it is >>going >>to see that another couple of queen moves draws. And it is going to >>then >>search for a way to push a pawn, or capture something. Being ahead +12 >>is >>enough to allow the queen sac and still remain far enough ahead in >>material >>to win. >> >>In 1986 we had a game somewhat like this at the WCCC in Germany. Except >>we were only up 1.5 pawns or saw. After about 30-35 moves of shuffling, >>Cray Blitz found what we already knew... it had to give up its pawn, but >>then could win. It did, but only when urged on by the threat of a draw. >>I think many programs would win this, assuming the game is played for >>another 45 moves. +12 is simply not going to draw. Now if we are into >>"elegant" wins, and if this has to be solved *now* or never, then we >>have >>a problem. But I've never seen a +12 position that wasn't winnable, >>except for a few that are close like Q vs bp... > > >Very well. So how about this discount: Set the 50-move counter to >something close to 50 and find the winning PV. > >Amir this I'll run... results soon...
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