Author: blass uri
Date: 03:53:52 07/02/99
Go up one level in this thread
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
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