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Rollouts: 4a4a cube action

Posted By: Timothy Chow
Date: Monday, 20 December 2010, at 9:49 p.m.

In Response To: 4a4a cube action (Timothy Chow)

The rollout suggests that Dmitriy's intuition is the most accurate of those who have posted here. I was surprised to see that the rollout indicates that the take is pretty close. XGR+, by the way, thinks the take is easy (0.814 or something like that). Can we trust the rollout, given that it differs so much from the evaluation? I think that the D/T equity is probably pretty reliable unless there's some reason to suspect that XG is mishandling the recube. The ND/T equity I'm less sure about. I'm also not sure whether it's O.K. to pretend that the pseudocubeless win/gammon numbers are real here.

I have also posted the money rollout (which indicates a TCTC double) and the position on the next roll after I lost my market. XGR+ thought it was still a paper-thin take (0.997) on the next roll but the rollout indicates a big pass, even though the exchange doesn't look like a massive market loser to the casual observer.





White is Player 2

score: 3
pip: 138
7 point match
pip: 141
score: 3

Blue is Player 1
XGID=--aaBBB-B--CcB---bBbbd----:0:0:1:00:3:3:0:7:10
Blue on roll, cube action?


Analyzed in Rollout
No Double
Player Winning Chances: 66.40% (G: 19.60% B: 1.41%)
Opponent Winning Chances: 33.60% (G: 8.85% B: 0.69%)
Double/Take
Player Winning Chances: 66.85% (G: 20.86% B: 2.48%)
Opponent Winning Chances: 33.15% (G: 9.70% B: 1.41%)
Cubeless Equities
No Double:+0.489
Double:+1.313
Cubeful Equities
No Double:+0.806 (-0.161)
Double/Take:+0.967
Double/Drop:+1.000 (+0.033)
Best Cube action: Double / Take
Rollout details
3888 Games rolled with Variance Reduction.
Moves and cube decisions: 3 ply
Confidence No Double: ± 0.016 (+0.790...+0.823)
Confidence Double: ± 0.022 (+0.945...+0.990)
Double Decision confidence: 100.0%
Take Decision confidence: 99.8%
Duration: 7 hours 54 minutes

eXtreme Gammon Version: 1.21, MET: Rockwell-Kazaross


Money rollout:





White is Player 2

score: 0
pip: 138
Money session
Jacoby
pip: 141
score: 0

Blue is Player 1
XGID=--aaBBB-B--CcB---bBbbd----:0:0:1:00:0:0:1:0:10
Blue on roll, cube action?


Analyzed in Rollout
No Double
Player Winning Chances: 67.02% (G: 18.29% B: 0.63%)
Opponent Winning Chances: 32.98% (G: 8.24% B: 0.30%)
Double/Take
Player Winning Chances: 67.11% (G: 19.75% B: 0.65%)
Opponent Winning Chances: 32.89% (G: 8.62% B: 0.37%)
Cubeless Equities
No Double:+0.340
Double:+0.912
Cubeful Equities
No Double:+0.685 (-0.002)
Double/Take:+0.687
Double/Drop:+1.000 (+0.313)
Best Cube action: Double / Take
Rollout details
2592 Games rolled with Variance Reduction.
Moves and cube decisions: 3 ply
Confidence No Double: ± 0.015 (+0.670...+0.699)
Confidence Double: ± 0.018 (+0.669...+0.705)
Double Decision confidence: 57.3%
Take Decision confidence: 100.0%
Duration: 5 hours 16 minutes

eXtreme Gammon Version: 1.21


Next roll:





White is Player 2

score: 3
pip: 130
7 point match
pip: 135
score: 3

Blue is Player 1
XGID=--aaBCB-B--BbB---bBbcd----:0:0:1:00:3:3:0:7:10
Blue on roll, cube action?


Analyzed in Rollout
No Double
Player Winning Chances: 67.06% (G: 23.28% B: 1.15%)
Opponent Winning Chances: 32.94% (G: 9.99% B: 0.78%)
Double/Take
Player Winning Chances: 67.27% (G: 25.08% B: 3.13%)
Opponent Winning Chances: 32.73% (G: 11.22% B: 1.61%)
Cubeless Equities
No Double:+0.529
Double:+1.458
Cubeful Equities
No Double:+0.789 (-0.211)
Double/Take:+1.153 (+0.153)
Double/Drop:+1.000
Best Cube action: Double / Drop
Rollout details
2592 Games rolled with Variance Reduction.
Moves and cube decisions: 3 ply
Confidence No Double: ± 0.016 (+0.773...+0.805)
Confidence Double: ± 0.029 (+1.124...+1.182)
Double Decision confidence: 100.0%
Take Decision confidence: 100.0%
Duration: 4 hours 10 minutes

eXtreme Gammon Version: 1.21, MET: Rockwell-Kazaross

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