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Subject: Re: Test Suites

Author: Tord Romstad

Date: 11:30:28 12/09/03

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On December 09, 2003 at 11:46:02, Mike S. wrote:

>On December 09, 2003 at 09:19:24, Tord Romstad wrote:
>
>>Is there a second solution in position number 16?  Gothmog wants to play c4,
>>and claims that this move gives mate in 12 moves ...
>
>No, because Kb7! gives the fastest mate. Every variant ends in 44. (6.) c7-c8#.
>Many engines prefer c4 at first, which ends in mate too - but later, so it's
>clearly second best only.

OK, but I still think this is not a very good test position.  Many engines
(including mine) are "lazy" and start pruning more aggressively for the
winning side when a clear win has already been found.  The idea is that it
is more important to make sure that there isn't a very deep refutation
of the apparently winning move than to look for an even more crushing win.

In general, I don't like tactical test positions with more than one clear
win.

Tord



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