Author: Sune Fischer
Date: 12:57:39 03/03/04
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On March 03, 2004 at 15:30:53, Dann Corbit wrote: >On March 03, 2004 at 06:04:29, Sune Fischer wrote: > >>On March 03, 2004 at 04:18:30, Paul Byrne wrote: >> >>>Granted, it is not a terribly useful position, as it came from a wild 8 (pawns >>>start on 4th rank) game on ICC between 2 patzers. And a very short search will >>>get you a score of +10 to +15 and better in white's favor. >>> >>>It is, however, surprisingly tough to see the mate, and makes an interesting >>>test position... >>> >>>r1b3n1/6k1/1n6/pP3qPQ/2PP2p1/1p4b1/4B3/R1BK2NR w - - 0 15 >>> >>>Guildenstern's normal search cannot see it here, while it's PN search gets it in >>>under 30 seconds on an athlon 2400+. The line the PN search produces is mate in >>>19, but is likely not optimal, as PN search is not terribly concerned with >>>winning in the least number of moves. >>> >>>So, what programs can see the win from here? >> >>Not mine, I get a +22 score though. >> >>How about this one from one of my recent games. >>I get a +13 score in a minute but no mate, I wonder if there is a mate >>within reach of any program? >> >>[D]r4rk1/ppqb1Nbp/2n3p1/8/3PN1P1/1BP1Q2P/PP6/R4RK1 w - - 0 23 > >Crafty output: >Crafty v19.11 > 13 10:20 14.08 1. Nd8+ Be6 2. Bxe6+ Kh8 3. Rxf8+ Bxf8 > 4. Nf7+ Qxf7 5. Bxf7 Bg7 6. Nd6 Rb8 > 7. Bd5 h5 8. gxh5 Bxd4 9. Nf7+ Kg8 > 10. Ne5+ Kg7 11. cxd4 gxh5 > time=16:39 cpu=88% mat=2 n=506049970 fh=95% nps=506K > ext-> chk=35658412 cap=825892 pp=74446 1rep=2877392 mate=172995 > predicted=0 nodes=506049970 evals=39811873 50move=0 > endgame tablebase-> probes=0 hits=0 > >White(1): Nd8+ Ok, guess if there is a mate it is pretty deep. I'm kind of happy about that, you see I lost this game as white (arg!), he was 200+ more than me and I threw it all way :( Of course when you lose such a position and everybody sees it you can expect to be teased a lot! At least now I can refute their claim that I had an easy mate :-) [Event "Klubtunering 2004"] [Site "Tapenten Ballerup"] [Date "2004.01.06"] [Round "4"] [White "Sune Fischer"] [Black "Jørgen Christensen"] [Result "0-1"] [WhiteElo "1751"] [BlackElo "1945"] 1. f4 d5 2. Nf3 Nf6 3. e3 g6 4. Be2 Bg7 5. O-O O-O 6. Qe1 c5 7. d3 Nc6 8. c3 Qc7 9. Nbd2 Ng4 10. Bd1 d4 11. exd4 cxd4 12. Ne4 e5 13. h3 Nh6 14. fxe5 Nf5 15. g4 Ne3 16. Bxe3 dxe3 17. d4 f5 18. exf6 Bxf6 19. Qxe3 Bg7 20. Bb3+ Kh8 21. Nfg5 Bd7 22. Nf7+ Kg8 23. Nf6+ Bxf6 24. Rxf6 Na5 25. Nd8+ Nxb3 26. Rxf8+ Kxf8 27. Rf1+ Kg8 28. Qe7 Qxd8 29. Qf7+ Kh8 30. Qd5 Qe7 31. Qxb3 Qe3+ 32. Rf2 Bc6 33. Qf7 Qg3+ 34. Kf1 Qxh3+ 35. Ke1 Re8+ 36. Kd2 Qe3+ 37. Kc2 Qe7 38. Qxe7 Rxe7 39. Kd3 Bd7 40. g5 Kg7 41. c4 h5 42. b4 h4 43. b5 h3 44. a4 Rf7 45. Re2 Bg4 46. Re1 Bf3 47. d5 h2 48. Kd4 h1=Q 49. Rxh1 Bxh1 50. c5 Rf4+ 51. Ke5 Rf5+ 0-1 An example of how not to play an attack, zzzzz.... -S.
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