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Subject: Re: BS 2830 Problem #5 is wrong.

Author: Vasik Rajlich

Date: 03:09:35 03/17/04

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On March 16, 2004 at 18:58:46, Dann Corbit wrote:

>See this thread:
>http://www.talkchess.com/forums/1/message.html?354948

Actually, it's a big problem to find a good tactical testsuite. A month or so
ago I went through BTS2830, trying the positions on the commercial programs in
order to understand their search better.

First problem is the false solutions. Rxe6 here is one of them - it's totally
unclear if it's better than Qh3. Another one was #2 or #3, where the "solution"
is .. Bh3+. Totally unclear if it's better than just .. Bg4, both are winning.

Second, much bigger, problem is that most of the problems are solved through
evaluation, not search. I would like positions where there comes a clear moment
in the search which you have to get to in order to "see" the solution. If I
remember correctly, there were only 2 or 3 positions in the entire BTS2830 which
met this criterion.

Third problem is positions which it's possible to "solve" without understanding.
(This could also be thought of as a problem with the Chessbase GUI which won't
let you set a score margin.)

It would also be nice to have a testsuite which has a certain consistent level
of difficulty. WAC is not interesting for this reason.

Anyway, I have some position-by-position notes on BTS2830 in Augsburg, could
post them next week.

Cheeers,
Vas



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