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Recube to 8?

Posted By: John O'Hagan
Date: Sunday, 24 June 2012, at 3:18 a.m.

In Response To: Recube to 8? (John O'Hagan)

Oppt needs 16% to take so our redoubling window closes at 84%. If there were no gammons, it would open at 50%. We win lots of gammons and lose very few so that affects the minimum doubling point. Redoubling to 8 only gains or loses when we win or lose a single game since a gammon for either side wins the match with the cube on 4. According to the (non stat sig) RO, ~ 45% of our wins and 91% of our losses are single wins/single losses. The gain from redoubling is therefore 45% of 16% while the loss is 91% of 16%. Risk/risk + gain is ~ 14.6/21.75, approx 67%. So the window opens at 67% and closes when oppt has an optional take/pass at 84%. The RO sez we're slightly over half the way in the window which usually means "no redouble" unless it's a real volatile position. This is pretty volatile since 66 and 55 always lose the mkt likewise any other 6 or 5 followed by a dance. That's 14.6 big mkt losers in 36 games. I redoubled but apparently it's very slightly better to take a roll.

is Player 2

score: 8
pip: 136
13 point match
pip: 83
score: 8

is Player 1
XGID=aBBBbCC-B-a-------bcbbAb--:2:1:1:00:8:8:0:13:10
on roll, cube action?

Analyzed in Rollout No redouble Redouble/Take
Player Winning Chances: 75.99% (G:41.99% B:2.48%) 75.87% (G:48.68% B:0.52%)
Opponent Winning Chances: 24.01% (G:2.10% B:0.11%) 24.13% (G:1.89% B:0.05%)
Cubeless Equities +0.704 +0.757
Cubeful Equities
No redouble:+0.759±0.002 (+0.757..+0.761)
Redouble/Take:+0.757 (-0.002)±0.002 (+0.755..+0.759)
Redouble/Pass:+1.000 (+0.241)
Best Cube action: No redouble / Take
Percentage of wrong pass needed to make the double decision right: 0.9%
Rollout details
5184 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller
Double Decision confidence:93.8%
Take Decision confidence:100.0%
Duration: 1 hour 30 minutes

eXtreme Gammon Version: 2.00, MET: Kazaross XG2

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