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Short rollout

Posted By: Matt Cohn-Geier
Date: Friday, 31 October 2008, at 11:50 p.m.

In Response To: Short rollout (Coolrey)

g11 is the default MET that GNU uses. It's a table that has been rolled out by GNU playing against itself (0-ply play/2-ply cube) up to 11-point matches. It is the most accurate table around, but using a different MET like Woolsey or something makes little difference OTB.

MEC26 is a match equity table derived by a short program (match equity calculator) written in 1996 by Claes Tornberg. It uses a flat 26% gammon rate figure, hence MEC26. Bots have done well with it, I think. Since it's derived by algorithm it's extendable up to whatever match length you want.

g11 defaults to MEC26 when it gets past 11-away, which means that for this problem, the two are probably interchangeable. However, g11 has some problems when it reaches cross-over scores around 12-away or 13-away. Since the table up to 11-away was generated by rollouts and the table more than 11-away was generated by an algorithm you can get strange results at those scores.

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