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

Author: Roy Brunjes

Date: 08:01:49 02/16/03



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:

[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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