Robertie Position 365

GNU agrees with Robertie here, but as with Position 362, I am posting the rollout anyway because I think the position is sufficiently interesting. Note that backgames are not GNU’s strength; however, eXtreme Gammon rollouts by neilkaz and by KenB come to the same qualitative conclusion (though XG and GNU assign quite different absolute equities to the given position, and XG thinks the decision is closer than GNU thinks).

Alert: wrong double ( -0.050)! [doubtful]

Cube decision
Rollout cubeless equity +0.471 
Cubeful equities:
1.No double +0.611 
2.Double, pass +1.000 +0.389
3.Double, take +0.561 -0.050
Proper cube action:No double, take (11.3%)
Rollout details
 WinW gW bg LoseL gL bgCubelessCubeful
Centered 1-cube0.6110.2950.018-0.3890.0630.002 +0.471 +0.611
Standard error0.0010.0010.001-0.0010.0010.000 0.003 0.007
Player gnubg owns 2-cube0.6120.2880.016-0.3880.0630.002 +0.925 +0.561
Standard error0.0010.0010.001-0.0010.0010.000 0.006 0.008
Full cubeful rollout with var.redn.
15552 games, Mersenne Twister dice gen. with seed 840277921 and quasi-random dice
Play: supremo 2-ply cubeful prune [world class]
keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
Skip pruning for 1-ply moves.
Cube: 2-ply cubeful prune [world class]