Author: Christophe Theron
Date: 17:46:47 11/12/99
Go up one level in this thread
On November 12, 1999 at 20:27:45, James T. Walker wrote:
>On November 12, 1999 at 11:54:32, Christophe Theron wrote:
>
>>On November 12, 1999 at 04:01:39, Bertil Eklund wrote:
>>
>>>On November 12, 1999 at 02:00:32, Ed Schröder wrote:
>>>
>>>>On November 11, 1999 at 20:18:18, Howard Exner wrote:
>>>>
>>>>>Here's the game which ended in a draw.[Event "SSDF 40-2"]
>>>>>[Site "DK-Albertslund"]
>>>>>[Date "1999.11.10"]
>>>>>[Round "23"]
>>>>>[White "Chess Tiger 12.0 dos K6-2 450,64"]
>>>>>[Black "Shredder 2 P200MMX 24+8"]
>>>>>[Result "1/2-1/2"]
>>>>>[WhiteElo "2645"]
>>>>>[BlackElo "2503"]
>>>>>[Annotator "Test: HC Lykke"]
>>>>>
>>>>>1. e4 c5 2. Nc3 d6 3. f4 Nc6 4. Nf3 Nf6 5. Bb5 e6 6. Bxc6+
>>>>>bxc6 7. d3 Be7 8. e5 Nd5 9. Ne4 dxe5 10. Nxe5 Bb7 11. O-O
>>>>>O-O 12. Qe2 f6 13. Nc4 Ba6 14. Bd2 Nb6 15. Na5 Qd7 16. Be3
>>>>>Na4 17. Qf2 c4 18. b3 f5 19. Nd2 cxd3 20. bxa4 Bb4 21. Nab3
>>>>>dxc2 22. Rfe1 Rad8 23. a3 Bc3 24. Nc5 Qe7 25. Nxa6 Bxa1 26.
>>>>>Rxa1 Qxa3 27. Qe1 Qc3 28. Rc1 Rd3 29. Kf2 Qb2 30. Nc4 Qa2
>>>>>31. Ne5 Rd1 32. Qc3 Rxc1 33. Bxc1 Qxa4 34. Nc5 Qa2 35. Ncd7
>>>>>Re8 36. Qxc6 Rd8 37. Qc7 Ra8 38. Qb7 Rf8 39. Nxf8 Qa5 40.
>>>>>Qf7+ Kh8 41. Nxe6 Qb6+ 42. Kg3 Qb3+ 43. Kf2 Qb6+ 44. Ke2
>>>>>Qa6+ 45. Kf2 Qb6+ 1/2-1/2
>>>>>
>>>>>Would the game end the same from move 41 on if it were manually played?
>>>>
>>>>Rebel-Tiger (beta) plays of course 43.Kh4 announcing mate in 3.
>>>>
>>>>No 45.Kf2??? also but 45.Ke3 announcing mate in 5.
>>>>
>>>>Perhaps something is wrong with the PGN moves?
>>>>
>>>>Even in the end-position Rebel-Tiger (beta) still announces a
>>>>mate.
>>>>
>>>>Ed
>>>Hi!
>>>
>>>In one of my testgames Tiger used 30(!!) moves for a simple mate in 4 or 5
>>>moves. Tiger won the game but after 10-15 moves with the same announcement mate
>>>in 4 or 5 I began to wonder if it should be a draw according to the 50-moves
>>>rule.
>>>
>>>Bertil SSDF
>>
>>
>>I have to say my 'mea culpa' here.
>>
>>The problem was not the engine in this case but the time manager.
>>
>>I have noticed during the French Championship last year that Tiger could spend a
>>long time before playing an obvious mate. In fact a mate move was considered as
>>any other move, so Tiger took his time to play it. This means probably one or
>>two minutes in a long time controls game.
>>
>>I thought that this was very bad manners for the opponent, so I decided to make
>>it more "elegant" and change the time management.
>>
>>The new version stopped to search as soon as a mate in X move was found. So in
>>this case it moved instantly.
>>
>>Great. But it is a bloody mistake. What happens? First, Tiger finds a mate in,
>>say, 5 moves. So it stops and announces "mate in 5". Then, on the next move, the
>>first mate it finds is a mate in 6. So it stupidly stopped and announced a mate
>>in 6, and was happy with it.
>>
>>This could be an infinite cycle, Tiger announcing mates in several moves, but
>>never actually checkmating the opponent.
>>
>>I have discovered this (old) bug on Nov 2, 1999, and it is now FIXED. The
>>current beta version does NOT have the bug, and that's why Ed cannot reproduce
>>it.
>>
>>Thanks to Howard Exner for pointing this out.
>>
>>
>>
>> Christophe
>
>
>I'm sure happy to 'hear' that's fixed. I'm waiting impatiently :-) for Chess
>Tiger to hit the streets. By the way, I got a glimpse of it on FICS and it is
>impressive. It seems like people/computers were standing in line to play it.
>Jim Walker
Oops... I thought this was a non-public experiment.
We are just stress-testing the beta version. The goal is just to let it play
several weeks in a row to check if everything runs smoothly (the engine, the GUI
and the Internet Chess Servers automatic management)...
I'm not in charge of this experiment, so I don't even know what the result is
sofar. I mean in win, draws and losses. For the reliability part, I know that
the product has been running perfectly well since it has been connected (several
days ago IIRC).
Christophe
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