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Subject: Shredder's bug?

Author: Jaime Benito de Valle Ruiz

Date: 05:53:39 12/21/03


I've never read any thread about this before, so forgive me if this is a
recurring topic.
Many people have noticed that the Principal Variation shown by Shredder is
sometimes ridiculous, to the point of giving out its queen and a rook for
nothing, or allowing a silly mate. If this is “really” what Shredder is
thinking, then I’m truly surprised that it’s such a strong engine… considering
that it chooses absurd lines that lead to self-destruction. My engine sometimes
does something similar, and I’m sure it’s a bug, because the final static
position of the PV does not match the score is showing anyway (I have other
things to correct before the PV at the moment anyway), and neither does for
Shredder.
Is this a really a bug, or just a trick to conceal the way engine is doing the
internal search? Because I don’t believe that those PVs are the ones Shredder is
using for analysis, and still play decent chess.
What do you think?

  Jaime Benito



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