Author: Peter McKenzie
Date: 02:16:44 06/05/02
Go up one level in this thread
On June 05, 2002 at 03:21:33, Gerd Isenberg wrote: >In the last round from 2nd CSNV in Leiden IsiChess played Sjeng and hit a lucky >punch with a little help of king (un)safety heuristics. But i'm not quite sure >whether the sac 22.Nf6+ really wins. What does your engine think about it? Warp likes Nf6+ at depths 6-8, then switches to R7f6, then back to Nf6+ at depth 11 then back to R7f6 at depth 12. The score is slightly negative all along. I didn't wait for depth 13 :-) > > >[Event "2nd Intl. CSVN"] >[Site "Leiden Ned"] >[Date "2002.06.02"] >[Round "9"] >[White "IsiChess X"] >[Black "Sjeng"] >[Result "1-0"] >[ECO "B84"] >[PlyCount "83"] >[EventDate "2002.05.??"] > >1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. Be2 Nf6 7. O-O Be7 8. f4 >d6 9. Be3 O-O 10. g4 Re8 11. f5 exf5 12. Nxf5 Bxf5 13. Rxf5 Bd8 14. Nd5 Qc8 15. >Qd3 Nc6 16. Raf1 Qe6 17. R1f4 Nxe4 18. Bf3 Ng5 19. Bg2 g6 20. Rf6 Qe5 21. Rxf7 >Qxb2 22. Nf6+ Kxf7 23. Nxe8+ Kxe8 24. Qxd6 Ne7 25. Rf2 Nf7 26. Qe6 Ne5 27. Kh1 >g5 28. Bxg5 N5g6 29. Bxe7 Qa1+ 30. Rf1 Qxf1+ 31. Bxf1 Bxe7 32. Bd3 Nf8 33. Qb6 >Rb8 34. Qc7 Rd8 35. Qxb7 Rd4 36. Qxa6 Kf7 37. h3 Kg7 38. a4 Rd5 39. a5 Bf6 40. >Qb6 Rd7 41. g5 Bxg5 42. Qg1 1-0 > > >Position before 22.Nxf6: > >[D] r2br1k1/1p3R1p/p1np2p1/3N2n1/5RP1/3QB3/PqP3BP/6K1 w - - > > >IsiChess played 22.Nf6+ with slightly positive score, but expected 22...Bxf6 >instead of 22...Kxf7. > >[D] r2bk3/1p2n2p/p2Q2p1/6n1/6P1/4B3/PqP2RBP/6K1 b - - am Nf7 bm h6 > >A few moves later Sjeng failed by 24...Nf7?, instead of 24...h6, which seems to >be unclear or drawish. Warp locks onto h6 at depth 6, and keeps it through to depth 12 at least. Score of zero. Peter > >Gerd
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