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Subject: Re: Criteria for Good Test Positions = ?

Author: Mike S.

Date: 12:47:19 12/10/02

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On December 09, 2002 at 19:37:17, Bob Durrett wrote:

>On December 09, 2002 at 17:19:19, Mike S. wrote:
>(...)
>>But for positional judgments, I would recommend to get the impression from
>>games the engine has played,
>
>But does that not also require the expert analysis?

For the "GM-like" cases, I guess so. But still, the engines make very ugly
positional blunders sometimes, which even less-than-2000 elo players like me
discover easily:

Fritz 7 - Nimzo 8 [A06] ½-½
Novemberturnier 60'/40 Wien (1.6), 14.11.2002
[D]rnbqkb1r/ppp1pp1p/5np1/3p4/8/1P3N2/PBPPPPPP/RN1QKB1R w KQkq - 0 4
4.Bxf6? [4.c4; 4.e3; 4.g3] wasting the fianchetto bishop and the bishop pair and
the same time, while the doubled pawn isn't such a big problem for black here,
IMO. This is a "nobody is perfect" example. (Usually, Fritz 7 does better than
that :o))

>(...)
>My thinking now is that it may be good to let a chess engine analyze the entire
>GM game.  The average analysis time per move could be set to approximate
>tournament time controls.  The key to success of this method would be to use
>extremely high quality games, with equally extremely high quality GM analyses.
>
>Then the computer's understanding of the positions of the game could be
>compared to the GM analyses.

You could try that using Fritz' "Full Analysis" feature or a similar feature of
another program. If there is a threshold value (like in Fritz) to be set, which
controls how big the difference of the evaluations has to be to produce a
commentary variant, then I'm afraid it would have to be set to a small value for
positional things. I would expect that positional observations are - most often
- about much smaller eval differences that i.e. a blunder which looses a pawn or
the like. In result of that, you will get comments and variants for very many
moves, and again, you would have to analyse what really makes sense for the
intended purpose...

I usually start all analysis with a non-automatic :o) manual browsing through
the game, more or less quick, where I'd already spot things like above (also
some less simple one's :o) That can be more effective IMO than let run long
time-consuming automatic analysis proceedures, whereafter one has to analyse
manually anyway again, to choose the really interesting things from all the
stuff the engine has produced.

Regards,
M.Scheidl



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