Author: Robert Hyatt
Date: 11:58:06 05/28/03
Go up one level in this thread
On May 28, 2003 at 01:06:40, Jeremiah Penery wrote: >On May 27, 2003 at 21:45:02, Mike Byrne wrote: > >>On May 27, 2003 at 19:11:49, Jorge Pichard wrote: >> >>>Six years later, which program can see the draw in the famous 2nd game of the >>>rematch? >>> >>>Jorge >> >>Given the position, there is only one possible move that could possibly lead to >>draw -- Qe3 ..I think Crafty might get the draw here base don the PV given... >> >> >>White(1): 1r6/5kp1/RqQb1p1p/1p1PpP2/1Pp1B3/2P4P/6P1/5K2 b - > > >> 16-> 4:01 1.92 1. ... Qe3 2. Qxd6 Re8 3. h4 h5 4. >> Bf3 Qc1+ 5. Kf2 Qd2+ 6. Be2 Qf4+ 7. >> Kg1 Qe3+ 8. Kh2 Qf4+ 9. Kh3 Qxf5+ 10. >> Kh2 Qf4+ 11. Kg1 Qe3+ 12. Kf1 Qc1+ >> 13. Kf2 Qf4+ 14. Bf3 Qxh4+ >> 17 5:45 1/31* 1. ... Qe3 > >If it behaves anything like older Crafties in this position, the score will drop >to near draw at around ply 21, then it will come up with a different PV and a >rising score again. Disappointing. I'd like to see you run this overnight, or >for a few days even. I ran it for several days a long while back and it behaved just as you said. One problem is the non-checking move at around ply 30 in the tree, as given on Ed's web page. Another problem is evaluation. In critical positions where material becomes equal, the evaluation has to favor the "right" side to have a chance to see the draw, otherwise the other side can vary almost infinitely to avoid repeating...
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