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Subject: Re: Fritz 8 blunders in drawn endgame : Does your program do the same?

Author: Robert Hyatt

Date: 08:56:20 02/16/03

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On February 16, 2003 at 11:01:49, Roy Brunjes wrote:

>
>In a game between Fritz 8 and a custom personality of mine for CM9000, the
>following position arose in a 15/10 game:
>
>[D] 5Q2/8/2p4k/1p1pP3/8/6KP/8/q7 b - - 0 45
>
>Black here should easily draw with ... Kh7.  Fritz 8 thinks for almost 30
>seconds on my Athlon 700 MHz machine and plays ... Kh5 and scores the position
>as 0.00 expecting a draw.
>
>CM9000 immediately shows evals nearly one pawn in its favor and after a few more
>moves, Fritz shows an eval of more than 4 pawns in White's favor.
>
>Curious that Fritz would err so greatly in a simple position.  Is it a bug or is
>it explainable some other way?
>
>Here is the entire game for those that may think the game history and draw
>detection may have something of a role in this 15/10 game:

Most likely it is just a lack of time.  Finding that Kh5 is trouble requires
at least several seconds for Crafty, while Kg6 is scored as a draw.



>
>[Event ""]
>[Site ""]
>[Date "2-15-2003"]
>[Round ""]
>[White "CM9000 Junior3 500MHz 32MB hash"]
>[Black "Fritz 8 700MHz 128MB hash"]
>[Result "1-0"]
>
>  1. e4             e5
>  2. Nf3            Nc6
>  3. Bb5            a6
>  4. Ba4            Nf6
>  5. O-O            Be7
>  6. Nc3            b5
>  7. Bb3            d6
>  8. Nd5            Na5
>  9. Nxe7           Qxe7
> 10. d4             O-O
> 11. Bg5            Bg4
> 12. h3             Nxb3
> 13. axb3           Bh5
> 14. b4             h6
> 15. Bxf6           Qxf6
> 16. Ra3            c6
> 17. Qd2            Rfd8
> 18. Rd3            Bxf3
> 19. Rxf3           Qh4
> 20. Re1            d5
> 21. Rf5            exd4
> 22. e5             Re8
> 23. Rf4            Qg5
> 24. Qxd4           Re6
> 25. Rf3            a5
> 26. bxa5           Rxa5
> 27. Rg3            Qf5
> 28. Qb6            Ra2
> 29. Rf3            Qxc2
> 30. Qd8+           Kh7
> 31. Rxf7           Rxb2
> 32. Kh2            Qc3
> 33. Qf8            Rg6
> 34. Rxg7+          Rxg7
> 35. Qf5+           Kg8
> 36. Ra1            Rxg2+
> 37. Kxg2           Rxf2+
> 38. Kxf2           Qb2+
> 39. Kg3            Qxa1
> 40. Qg6+           Kh8
> 41. Qxh6+          Kg8
> 42. Qe6+           Kg7
> 43. Qf6+           Kh7
> 44. Qf7+           Kh6
> 45. Qf8+           Kh5
> 46. Qe8+           Kg5
> 47. h4+            Kf5
> 48. Qf7+           Ke4
> 49. e6             Qg1+
> 50. Kh3            Qe3+
> 51. Kg4             1-0
>
>
>Roy



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