Author: Frank Schneider
Date: 04:37:40 02/18/99
Go up one level in this thread
On February 18, 1999 at 05:13:54, Dusan Dobes wrote: >On February 18, 1999 at 04:24:18, Jouni Uski wrote: > >>Fritz5 ECM is tactical testsuite with a lot of sacrifices in 216 positions. >>Phalanx XX solves full 100 positions in 1 min level in P90. On contrary Crafty >>16.2 solves "only" 73. But in actual play Phalanx loses almost all games against >>Crafty! Score in 5 min blitz Phalanx - Crafty 3 - 17... > >Phalanx has quite large king safety bonuses in it's static evaluation. >These bonuses make it often sacrifice material for king safety. >In practical play, these sacrifices are sometimes correct, sometimes >incorrect (but always funny and even incorrect sacrifices often win >against humans). In test suites, the sacrifices are always correct, >that's the way how the positions in test suites are selected. > >I agree. Running test suites is a poor way to compare the playing >strength. Running comp-comp blitz matches isn't much better either. >I admit that i run these matches too :-). I use longer time controls >(e.g. 30 minutes + 30s increment on a P90). My results against >Crafty are not that bad. > >I suggest upgrading Phalanx to version XXI. Phalanx XX has an ugly >bug in the static evaluation that make it drop all it's material >in most engames with outside passed pawns. It was detected by >Zeke Smigel who was running Phalanx on ICC, this is the critical >position: 8/6k1/6b1/3P2P1/6R1/2N1q3/1P3RK1/8 w - - 0 51 Rf7+?? There was another position in the winboard-tournament, I think in this game: [Event "WinBoard 4.0.0, Turnier 3"] [Site "Trier/Hamburg"] [Date "1999.01.23"] [Round "7.1"] [White "Phalanx"] [Black "Gromit"] [Result "0-1"] [ECO "C01"] [WhiteElo "2437"] [BlackElo "2441"] [PlyCount "134"] [EventDate "1998.??.??"] 1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Nf6 5. Bd3 Bd6 6. O-O O-O 7. Bg5 Bg4 8. Nbd2 Nbd7 9. c3 h6 10. Bh4 c5 11. dxc5 Nxc5 12. Qc2 g5 13. Bg3 Bxg3 14. hxg3 Re8 15. Nd4 Nxd3 16. Qxd3 Qb6 17. N2b3 a5 18. a4 Bd7 19. Ra3 Re5 20. Qd2 Rae8 21. Nc1 Ne4 22. Qc2 Nc5 23. Nd3 Nxd3 24. Qxd3 Qxb2 25. Rb3 Qa2 26. Rxb7 Qxa4 27. Qd2 R5e7 28. Rb6 Kg7 29. f4 Qc4 30. fxg5 h5 31. Rh6 Qc7 32. Qd3 Rh8 33. Qf3 Qe5 34. Rf6 Rf8 35. Qxh5 Qe4 36. R1f5 Qb1+ 37. Kh2 Bxf5 38. Nxf5+ Qxf5 39. Qh6+ Kg8 40. Rxf5 Re6 41. g6 Rxg6 42. Rg5 Rxg5 43. Qxg5+ Kh7 44. Qxd5 Kg6 45. Qxa5 Rh8+ 46. Kg1 f6 47. g4 Rf8 48. Qf5+ Kg7 49. g5 fxg5 50. Qxg5+ Kh7 51. Qg4 Rg8 52. c4 Rxg4 53. g3 Rxc4 54. Kg2 Re4 55. Kf3 Re6 56. Kg4 Kg6 57. Kf4 Re8 58. g4 Kf6 59. g5+ Kg6 60. Kg4 Rf8 61. Kh4 Rf4+ 62. Kh3 Kxg5 63. Kg3 Rf8 64. Kh3 Kf4 65. Kg2 Kg4 66. Kh2 Kf3 67. Kh1 Kf2 0-1 51. Qg4 ... 52. ... Rxg4 Seems Gromit was lucky :) > >Dusan Frank
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