Author: Uri Blass
Date: 12:45:36 12/03/02
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On December 03, 2002 at 13:57:40, Omid David Tabibi wrote: >On December 03, 2002 at 13:44:21, Colin Frayn wrote: > >>Here's an interedting position that arose in an ICC game between Beowulf and a >>human player. it's one of those positions where Beowulf knows it's behind, but >>can't possibly realise how bad his position is because he doesn't realise how >>his h7 rook is utterly trapped. >> >>[D]r4k2/2R2p1r/4pBp1/4P2p/pR3P1P/Pb2K1P1/8/8 b - - >> >>I'm not sure how to get round this without adding in some hideously slow code. >>I already have mobility code in for the rook but then it's difficult to >>distinguish between a rook that's in a nice defensive position that it could get >>out of and which will transform itself into an open file fairly quickly after a >>pawn exchange, and something like this where there is no sequence of moves to >>retrieve the rook from its corner. >> >>Cheers, >>Col > > >Your problem reminds me of the match between Junior and MIT's CilkChess in the >1999 WCCC. After the 25th move, CilkChess' evaluation showed a clear advantage >for black (CilkChess), not seeing that the rook on h5 can't move at all: > >[D] 5k2/p2p3p/2p2pp1/3p3r/1P1N1P1P/6P1/P5B1/4K3 b - - 0 25 > >And Junior went on to win the game: Movei can see a clear advantage for white. depth=14 -0.93 h5h6 g2f3 f8e7 e1d2 e7d8 a2a4 f6f5 a4a5 d8c7 a5a6 d7d6 d4e6 c7d7 e6d4 c6c5 Nodes: 6025634 NPS: 105380 Time: 00:00:57.18 depth=15 -1.04 h5h6 e1f2 f8e7 a2a4 e7d6 f2e3 d6c7 a4a5 f6f5 g2f3 d7d6 b4b5 c6b5 d4b5 c7c6 b5a7 c6c5 Nodes: 13577217 NPS: 106312 Time: 00:02:07.71 depth=16 -0.99 h5h6 g2f3 f8e7 a2a4 e7d6 a4a5 f6f5 a5a6 d6c7 e1d2 c7b6 f3e2 c6c5 b4c5 b6c5 d4b3 c5d6 b3d4 Nodes: 30286506 NPS: 108437 Time: 00:04:39.30 Uri > >[Event "WCCC99"] >[Site "Paderborn"] >[Date "1999.06.15"] >[Round "3"] >[White "Junior"] >[Black "Cilkchess"] >[Result "1-0"] > >1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. e5 Qe7 7. Qe2 Nd5 8. >c4 Ba6 9. b3 g6 10. Bb2 Bg7 11. g3 O-O 12. Bg2 Rae8 13. O-O Bxe5 14. Qxe5 Qxe5 >15. Bxe5 Rxe5 16. f4 Rh5 17. cxd5 Bxf1 18. Kxf1 cxd5 19. Nd2 c6 20. Re1 f6 21. >Nf3 Rd8 22. h4 Kf8 23. b4 Re8 24. Nd4 Rxe1+ 25. Kxe1 Ke7 26. Kd2 Kd6 27. Bf3 Rh6 >28. a3 Kc7 29. Bg4 Kd8 30. a4 Kc7 31. a5 Kd6 32. Kd3 Kc7 33. b5 c5 34. b6+ Kb7 >35. Nb5 axb6 36. Nd6+ Ka6 37. Nf7 Rh5 38. Bxh5 gxh5 39. axb6 Kxb6 40. Nh6 Kc7 >41. Ng8 f5 42. Ne7 d4 43. Nxf5 Kc6 44. Kc4 d6 45. Ng7 d5+ 46. Kd3 Kd6 47. Nxh5 >Ke7 48. f5 Kd6 49. f6 Ke6 50. g4 Kf7 1-0
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