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Subject: Re: oops! that was the 3rd position. #2:

Author: Peter McKenzie

Date: 16:21:27 06/16/02

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On June 16, 2002 at 12:47:37, Christophe Theron wrote:

<snip>>
>>>Just out of curiosity: what did you suspect???
>>
>>I suspected that Tiger would be a bit slow on this position (relative to the
>>other strong programs that is).  I figured its pruning would have some trouble
>>with this particular case...
>
>
>
>That is maybe the case, yes. I don't care much about solving test suites faster.

Right, although this position did occur in a game but it is still just a one off
position.

>
>I know that if I wanted to I could. We all know that it is easy to extend more
>aggressively on checks, responses to checks with few legal moves, recaptures and
>so on.
>
>But that makes the program weaker overall.

Sure, I understand this.

>
>What I like the most is to work in making the program stronger overall (say "in
>real games"), and then notice that it gets better scores on test suites.

agreed

>
>I remember it happened on the Louguet Chess Test 2 with version 12.0. I was
>happy with that.
>
>There are lots of positions where Tiger does not perform well and has "tactical
>holes". That's OK with me, because after all human players have exactly the same
>problems, even the strongest. I still believe human players have a superior
>search, and having such holes is a part of it.

Yes these holes must be accepted to a certain extent.  The trick of course is to
plug the most important holes.  Does this position show us a hole that is
important?  I'm not sure, but its worth a look I think.

I saw this position exposed a hole in my program, so I was curious what other
programs had the same hole.  I know Tiger prunes aggressively, thats why I asked
about it.

Peter

>
>
>
>    Christophe



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