Author: John Merlino
Date: 09:41:22 04/01/99
Go up one level in this thread
On March 31, 1999 at 14:02:35, Jon Dart wrote: >Here is an interesting position from a game my program >played on FICS recently: > >r1r2k2/1p4pQ/1n1bp2p/p2n1p2/P2P2Nq/1B5P/1P3PP1/R1BR2K1 w - f6 > >White (the human player) played Re1, leaving the Knight hanging, >and won, after fxg4 Rxe6 Rxc1+ Rxc1 Qg5 Rce1 gxh3 Re8+ Kf7. >Very impressive, especially in a blitz game! However, my program >did not find the best defense : fxg4 Rxe6 gxh3, etc. > >Crafty 16.5 likes Re1, but it takes a long time to see it, and >even then, with the amount of time I gave it, assigned it only >a small plus score. I'm not sure it's enough better than the >alternatives to be a "best move". Here is the output: > > 11 2:49 -0.37 1. Ne3 Qh5 2. Nxd5 Nxd5 3. Bd2 Kf7 > 4. Bxd5 exd5 5. Bxh6 Bf8 6. b4 Qxh6 > 7. Qxf5+ Qf6 8. Qxd5+ > 11 5:37 ++ 1. Re1!! > 11 6:20 0.10 1. Re1 fxg4 2. Rxe6 gxh3 3. Qf5+ Nf6 > 4. Rxd6 h2+ 5. Kh1 Nc4 6. Rd7 b6 7. > d5 > 11-> 7:39 0.10 1. Re1 fxg4 2. Rxe6 gxh3 3. Qf5+ Nf6 > 4. Rxd6 h2+ 5. Kh1 Nc4 6. Rd7 b6 7. > d5 > 12 11:31 0.08 1. Re1 fxg4 2. Rxe6 gxh3 3. Qf5+ Nf6 > 4. Rxd6 h2+ 5. Kh1 Nc4 6. Rd7 b6 7. > d5 Qg4 > 12-> 15:35 0.08 1. Re1 fxg4 2. Rxe6 gxh3 3. Qf5+ Nf6 > 4. Rxd6 h2+ 5. Kh1 Nc4 6. Rd7 b6 7. > d5 Qg4 > 13 26:30 0.06 1. Re1 fxg4 2. Rxe6 gxh3 3. Qf5+ Nf6 > 4. Rxd6 Nc4 5. Rd7 h2+ 6. Kh1 <HT> > time=33:20 cpu=99% mat=0 n=344343893 fh=94% nps=172105 > ext-> checks=20911812 recaps=1000315 pawns=174053 1rep=1446615 > predicted=0 nodes=344343893 evals=34920023 > endgame tablebase-> probes done=0 successful=0 plimit=17 > hashing-> trans/ref=19% pawn=4% used=99% > >Here is the whole game: > >[Event "?"] >[Site "FICS"] >[Date "1999.03.30"] >[Round "?"] >[White "bielg"] >[Black "Arasan 5.1"] >[Result "1-0"] >[ECO "D18"] >[WhiteELO "2227"] >[BlackELO "2270"] >[TimeControl "120+12"] > >1. Nf3 d5 2. d4 c6 3. c4 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 >Bb4 8. O-O Nbd7 9. h3 O-O 10. Qb3 c5 11. Nh4 Bxc3 12. Nxf5 Bb4 >13. Ng3 Nb6 14. Bd3 a5 15. Rd1 cxd4 16. exd4 Nfd5 17. Ne4 Qh4 18. Ng5 >h6 19. Bh7+ Kh8 20. Nf3 Qf6 21. Bc2 Kg8 22. Qd3 Rfc8 23. Qh7+ Kf8 >24. Ne5 Bd6 25. Ng4 Qh4 26. Bb3 f5 27. Re1 fxg4 28. Rxe6 Rxc1+ >29. Rxc1 Qg5 30. Rce1 gxh3 31. Re8+ Kf7 1-0 Chessmaster 6000 finds Re1 in 3 seconds on a P2-300 at a depth of 2/6. It saw the "best defense" that you describe after 10 seconds. After thinking for 6 minutes, to a depth of 4/10 (4 plies brute force, 10 plies nominal search), it's line is: 1.Re1 fxg4 2.Rxe6 gxh3 3.Qf5+ Nf6 4.Rxd6 hxg2 5.Kxg2 Nc4 With a score of 0.29 for white. jm
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