[Bug-gnubg] SGF Double Analysis Format

[Ryan McKinnon]

Hi,

I have a question about the format in which double analysis 
is saved by gnubg in sgf files.  For example, here is a sample double 
action evaluation from gnubg:

Cube analysis
2-ply cubeless equity  +0.243 (Money:  +0.246)
  0.573 0.222 0.024 - 0.427 0.140 0.006
Cubeful equities:
1. No double            +0.349
2. Double, pass         +1.000  ( +0.651)
3. Double, take         +0.219  ( -0.130)
Proper cube action: No double, take (16.6%)

(see image here: http://img689.imageshack.us/img689/2342/doubleaction.png)

And the corresponding section in the sgf file, when a double was mistakenly offered:

;B[double]DA[E ver 3 2C 1 0.000000 1 0.572881 0.222155 0.024300 
0.139598 0.006174 0.243145 0.527005 0.572881 0.222155 0.024300 0.139598 
0.006174 0.243145 0.516940]BM[2]

I can clearly see that it's a 
2ply evaluation, and note the wins, gammons, backgammons, and opponent's
 gammons and backgammons.  The item 0.243145 appears to be the cubeless 
equity, but I'm not sure how can I can calculate the cubeful no double 
and double/take equities from the info here in the sgf file.  (It looks 
like 0.527005 and 0.516940 might have something to do with these equity 
values, but I'm not sure.  Also, presumably the wins/gammons/backgammons
 breakdown is repeated because it pertains separately to no double and 
double/take?)  Can anyone enlighten me?

Thank you!

Ryan