Author: Will Singleton
Date: 19:43:23 11/13/05
Go up one level in this thread
On November 13, 2005 at 15:01:29, Jon Dart wrote:
>This game had an interesting ending:
>
>[Event "?"]
>[Site "chessclub.com"]
>[Date "2005.11.12"]
>[Round "?"]
>[White "Arasan 9.0"]
>[Black "thebaron"]
>[Result "0-1"]
>[ECO "B42"]
>[WhiteElo "2599"]
>[BlackElo "2506"]
>[TimeControl "1200+10"]
>
>1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Nf6 6. O-O Nc6
>7. Nxc6 dxc6 8. Bf4 Bd6 9. e5 Nd5 10. Qg4 Nxf4 11. Qxg7 Rf8 12. exd6
>Nxd3 13. cxd3 Qxd6 14. Nc3 f5 15. Qxh7 Bd7 16. Qh5+ Kd8 17. Rfe1 Kc7
>18. Qe2 c5 19. Rad1 Rh8 20. Qe5 Rh4 21. Qxd6+ Kxd6 22. g3 Rg8 23. Kg2
>b5 24. f3 Bc6 25. a3 e5 26. Rd2 Rf4 27. Re3 b4 28. axb4 cxb4 29. Nd1
>a5 30. Rde2 Rd4 31. Nf2 Re8 32. Nh3 a4 33. Ng5 Bd5 34. Kf2 Ra8
>35. Re1 a3 36. Rxe5 a2 37. R5e2 Rxd3 38. Ra1 b3 39. h3 Rc8 40. Kf1
>Rc2 41. Ke1 Rdc3 42. Rd1 0-1 {ArasanX resigns}
>
>In this position, White is already in trouble, but 36. Rxe5 looks
>like a mistake. Chess Tiger avoids it immediately, and gives a
>+2 or so plus score for Black after forcing Rxe5. But several other
>programs, including mine, want to play it.
>
>[D] r7/8/3k4/3bppN1/1p1r4/p2PRPP1/1P3K1P/4R3 w - -
>
>At move 38, we have this position for Black:
>
>[D] r7/8/3k4/3b1pN1/1p6/3r1PP1/pP2RK1P/R7 b - -
>
>Here b3 is indeed the best move, but Arasan doesn't find it
>readily. This is my lastest build in multi-variation mode,
>1 hour per move:
>
>result: Kd7 3600 seconds. score: +1.38 2038387785 nodes. ** error
>
>Kd7 Kg1 Bb3 Kf2 Rd8 Ree1 Rd2+ Ke3 Rxh2 Kf4 Rf8 Re5 Rd2 Rb5 Rd4+ Ke5 Rc4 Ne6
>result(2): Rc8 3600 seconds. score: +2.22 2000296738 nodes.
>** error
>Rc8 b3 Bxb3 g4 Rg8 h4 fxg4 fxg4 Rf8+ Ke1 Rd4 Ne4+ Kc6 Nf2 Bc4 Raxa2 Bxa2 Rxa2 Rh
>8 Rd2 Rxd2
>result(3): b3 3600 seconds. score: +3.00 2030428316 nodes.
>++ correct
>b3 h4 Rc8 Ke1 Bxf3 Nxf3 Rxf3 Rd2+ Kc5 Rc1+ Kb6 Rd6+ Ka7 Rd7+ Kb8 Rcd1 Rxg3 Kf1 R
>h3 Kg1 Rxh4
>
>So it actually had to be forced to eliminate Kd7 and Rc8 before
>selecting b3. I am still looking into the reason.
Forcing b3, mine sees its value quickly, but like yours, won't play it.
Will
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