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Can anyone recreate this GNU 4-Ply Nonsense? - EXPERIMENT

Posted By: Michael Petch
Date: Tuesday, 1 September 2009, at 10:57 a.m.

In Response To: Can anyone recreate this GNU 4-Ply Nonsense? - EXPERIMENT (Michael Depreli)

;-) this confirms my finding on my Linux builds. The bug is a caching issue when plies are > 3. Cache > 0 and Plies > 3 can potentially lead to some unwanted results such as these. It would also affect any rollout with checker/cube plies > 3. This is not a new bug, but is being discovered because of faster equipment and people running more evals with plies > 3.

We discovered the actual bug (There is a discussion on the GnuBG mailing list), and have a solution for it, and will be a priority to implement (I hate to make promises but I hope for the next Windows Build).

For now if you want to trust Plies > 3, set caching to zero.

Thanks for the report.

Michael

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