Author: Robin Smith
Date: 14:06:44 07/02/99
Go up one level in this thread
On July 02, 1999 at 06:53:52, blass uri wrote:
>
>On July 02, 1999 at 03:30:04, Robin Smith wrote:
>
>>On July 01, 1999 at 23:49:48, Ted Sutton wrote:
>>
>>>Robin,
>>> Thanks for a fascinating post with regard to positions in the 11th USCCC where
>>>you believe your opponents relied on a computer for a faulty evaluation.
>>> This would be a very interesting and relevant test case for us,if you would
>>>care to share several of these positions with us (naturally without names).
>>>We are dealing here with very strong correspondence play, so can see what of
>>>errors of positional judgement computers make.
>>> (I was unaware that computer use is legal in the USCCC, but it is logical,
>>>since the USCCC is an ICCF sponsored event, and computers are legal under ICCF).
>>> In view of the fact that computer use was legal in these games, then your
>>>opponents, assuming they were consulting with computers, were acting ethically
>>>and legally (though perhaps unwisely), and there is no reason not to disclose
>>>these positions.
>>
>>Sure, here are a couple. Of course I don't KNOW how my opponents generated
>>moves, it's just a theory. Interestingly the errors are more tactical than
>>positional, but the lines are pretty deep. The 1st one really looks computer
>>horizon effect. The 2nd game was published in the November 1998 Chess. Modern
>>computers/programs probably do better than at the time these games were played.
>>
>>[Event "US11F"]
>>[Date "1995-1998"]
>>[White "Smith, Robin"]
>>[Black "Thompson, Paul"]
>>[Result "1-0"]
>>[ECO "B89"]
>>[Annotator "Robin Smith"]
>>
>>1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4 e6 7. Be3 Be7 8.
>>Qe2 a6 9. O-O-O O-O 10. Bb3 Qc7 11. g4 Nxd4 12. Rxd4 Nd7 13. g5 Nc5 14. Rg1 b5
>>15. e5 dxe5 16. Rh4 Nxb3+ 17. axb3 g6 18. Qf3!? {White gambles on a strong
>>sacrificial attack that should be a draw with correct defense by Black.} Bb7 19.
>>Qh3 h5 20. Rxh5 gxh5 21.Qxh5 Bf3??
>>
>>Black is now lost. Computers like this move because, being up a whole rook,
>>they don't like to settle for a draw. 21... Bc5! is the only move after which
>>22. Bxc5 Qxc5 23. g6 Kg7!=draw
>
>I do not think that computers like this move if you give them many hours.
>I tried the position with Junior5.4 and it found Bc5 in less than 10 minutes.
>I do not know the exact time because I did other things at the same time and the
>computer may be slowed down.
>It evaluates Bc5 as 0.52 pawns for white and gives the same line
>22.Bxc5 Qxc5 23.g6 Kg7...
>
>Uri
The move 21. ...Bf3?? was played several years ago. At that time computers were
not as good as today. Also, after 21. ...Bc5 22.Bxc5 Qxc5 23.g6 Kg7 I am
surprised Junior5.4 gives a White advantage. I believe that the best plan for
White is to 3 repeat the position with perpetual checks. What does Junior 5.4
give as White's best continuation after you force the moves through 23. ...Kg7?
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