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Rollout - not that this settles anything

Posted By: Daniel Murphy
Date: Tuesday, 27 April 2010, at 7:59 p.m.

In Response To: Rollout - not that this settles anything (Timothy Chow)

I think Blue should open the prime now, so I don't think much of the rollout.

Gnubg 2-ply's cube action is suspect, as well. Two examples:

(1) Gnubg doesn't double this ~0.950 redouble/take (no double ~0.900 in rollout)

Scoreless game. Blue on roll. Cube action?

White40


4X2X1O ' '1O '1X ' ' ' '

1X '3O3O2O3O ' ' ' '2O '

Blue112

Position ID: byAAQLjbwQARAA Match ID: UQkAAAAAAAAA

Cube decision
2-ply cubeless equity +0.3778
0.7152 0.0000 0.0000 - 0.2848 0.0504 0.0022
Cubeful equities:
1.No double +0.6762
2.Double, pass +1.0000 +0.3238
3.Double, take +0.5622 -0.1140
Proper cube action:No redouble, take (26.0%)

(2) Gnubg 2-ply redoubles and takes this ~1.300 drop

Scoreless game. Blue on roll. Cube action?

White57


4X2X ' ' '1O '1O ' ' ' '

1X '3O3O2O3O ' ' ' '2O '

Blue107

Position ID: bwAAoLjbwUACAA Match ID: UQkAAAAAAAAA

Cube decision
2-ply cubeless equity +0.5308
0.7762 0.0000 0.0000 - 0.2238 0.0209 0.0008
Cubeful equities:
1.Double, take +0.9094
2.Double, pass +1.0000 +0.0906
3.No double +0.8907 -0.0187
Proper cube action:Redouble, take

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