Author: Uri Blass
Date: 05:20:52 07/29/04
Go up one level in this thread
On July 29, 2004 at 01:46:54, Uri Blass wrote: >On July 28, 2004 at 17:39:10, John Merlino wrote: > >>On July 28, 2004 at 16:03:53, Kurt Utzinger wrote: >> >>>How fast does your engine find the winning move 24.Bxg6 >>>but showing a positive score? Below the output of Crafty 19.15 >>> >>>24.Bxg6!! >>>[D]2r2rk1/p3bb1p/2n1Q1p1/q2pP3/3P1P2/p1NB1NR1/1P4P1/1K1R4 w - - 0 24 >>> >>>[Event "New York"] >>>[Site "New York"] >>>[Date "1947.??.??"] >>>[Round "?"] >>>[White "Evans, L."] >>>[Black "Pilnick, C."] >>>[Result "1-0"] >>>[ECO "C13"] >>>[PlyCount "57"] >>>[EventDate "1947.??.??"] >>> >>>1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. Bxf6 Bxf6 6. e5 Be7 7. Qg4 O-O 8. >>>O-O-O c5 9. h4 cxd4 10. Nce2 Nc6 11. f4 Qa5 12. Kb1 d3 13. cxd3 Bd7 14. Rh3 >>>Rac8 15. Rg3 g6 16. d4 b5 17. h5 Nb4 18. a3 Nc6 19. hxg6 fxg6 20. Nc3 b4 21. >>>Bd3 Be8 22. Nf3 bxa3 23. Qxe6+ Bf7 24. Bxg6 axb2 25. Bxh7+ Kh8 26. Qh6 Qa1+ 27. >>>Kc2 b1=Q+ 28. Rxb1 Nb4+ 29. Kd1 1-0 >> >>This position was posted several weeks ago, and resulted in a small article by >>GM Evans in Chess Life. >> >>The original test position was to find 23.Qxe6+ with a winning score. That was >>VERY difficult, and I don't know if any engine will be able to do it in under 10 >>minutes. >> >>jm > >Finding Qe6 with positive score in less than 10 minutes does not seem to me >extremely hard task for the top engines > >Even weak movei on slow hardware almost can do it in analysis mode. > >depth=12 +0.08 g4e6 e8f7 d3g6 f7e6 g6h7 g8h8 d1h1 e7h4 h7d3 e6h3 f3h4 c6e5 d4e5 >a3a2 b1a1 >Nodes: 80220868 NPS: 125266 >Time: 00:10:40.40 > >Note that movei usually search near 500 Knodes on A3000 >I am not sure if I can reproduce this result because movei analyzed another >position earlier so it may have initial different order of pieces that can give >different number of nodes but I do not expect a big difference. > >I will try later on fast hardware without previous analysis after I stop the >match between movei and Jonny. > >Uri I remember the words positive score in the first post but I see now that positive is not enough and you asked for winning score. Movei needs one ply more in order to find more convincing positive score of more than 1 pawn for itself. Uri
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