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Subject: Re: 50 moves rule in Crafty and Arena

Author: Christopher Conkie

Date: 07:02:29 09/01/04

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Hello Uri,

You really did make me laugh when I saw this game. It's very instructive. :-)
I saw your game and immediately thought of Karpov-Chernin, Interpolis Rapid
Tilburg 1992. :-) Here it is....

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 Bg4 5. Qb3 Qb6 6. Qxb6 axb6 7. cxd5 Nxd5 8.
Nxd5 cxd5 9. Bd2 Bd7 10. Nf3 Nc6 11. Ne5 Nxe5 12. dxe5 e6 13. a3 Bc6 14. Bc3 b5
15. b4 Be7 16. Bd3 f6 17. f4 O-O 18. O-O Ra6 19. Bb2 Bd8 20. Bd4 Bb6 21. Bxb6
Rxb6 22. Rfc1 fxe5 23. fxe5 Rd8 24. Rc5 d4 25. e4 Ra8 26. Kf2 Kf7 27. Ke2 Ke7
28. Kd2 Kd7 29. a4 Rba6 30. Bxb5 Bxb5 31. Rxb5 b6 32. Rc1 R8a7 33. Kd3 Rxa4 34.
Rxb6 Ra2 35. Rcc6 R7a3+ 36. Kxd4 Rd2+ 37. Kc5 Rc3+ 38. Kb5 Rxc6 39. Rxc6 Rxg2
40. Kb6 Rxh2 41. Rc7+ Kd8 42. b5 g5 43. Rg7 h5 44. Kc6 g4 45. b6 Rc2+ 46. Kd6
Kc8 47. Kxe6 Rc3 48. Rg5 Rc6+ 49. Kf7 Kd7 50. b7 Rb6 51. e6+ Kc7 52. e7 Rxb7
53. e8=Q Kd6+ 54. Qe7+ Rxe7+ 55. Kf6 Re6+ 56. Kf7 Re5 0-1

You may already know this but, for those who may not, Karpov in time trouble
played 54. Qe6+. The reply from Chernin? 54...Rxf7!! of course. Much frivolity
in the galleries as you can imagine. The arbiter moved in and asked for a
correct move to be played to which Anatoly played the unfortunate move 54.Qe7+.
But he was in time trouble.

Well that's human games taken care of...

But in computer engine games the arbiter is the interface...no? If the interface
allows an illegal move, it's a bug. Otherwise you could just make an engine that
played illegaly and always win!

Interestingly Arena allows your game to be played through from pgn, even with
two white bishops on the board. But it does not allow this to take place in a
real time match. So I suppose it could never happen, or is there a interface
that allow this kind of thing? I don't know.

Still, you have invented a whole new game! :-)

Very funny as I have said. Laughing is good for everyone. Well done. :-)

Kind Regards

Christopher



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