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[Bug-gnubg] Doubling analysis in SGF

From: Guido Flohr
Subject: [Bug-gnubg] Doubling analysis in SGF
Date: Thu, 05 Jul 2012 13:11:28 +0300


I'm trying to display as much information as possible from what GNUBG
writes into the DA property of SGF files.  For evaluation results (as
opposed to rollout results), the property contains 21 space-separated
tokens.  Tokens 0-6 describe the analysis settings.

The remaining 14 tokens contain two arrays of seven
probabilities/equities each.

The first array is clear.  It contains five probabilities (W, Wg, Wbg,
Lg, Lbg) followed by equity and cubeful equity.

What is the second array of seven floats?

I also cannot find a way to calculate the cubeful equities and the
proper cube action from the data provided in the SGF file.  My
impression is that I need the match equity table that gnubg used.  Or
did I miss anything here?

I could fall back to only displaying proper cube actions (without exact
numbers), when GNUBG marked a move with BC (bad cube) or DC (doubtful
cube) in the SGF data.  But for a missed double I still wouldn't be able
to distinguish the cases "double, take" and "double, pass", right?

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