Author: Omid David Tabibi
Date: 10:57:40 12/03/02
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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: [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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