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501 Essential Backgammon Problems #213 -- Rollout + Variants

Posted By: Igor
Date: Saturday, 26 October 2013, at 3:37 p.m.

In Response To: 501 Essential Backgammon Problems #213 (Igor)

Making the 9pt is such a natural play. But with the cube turned a couple extra gammons after 8/4 6/4 make this play come out just slightly ahead. Very tough play to figure out.

 White is Player 2 score: 0 pip: 135 Unlimited GameJacoby pip: 126 score: 0 Blue is Player 1
XGID=-a---CD-C--AcDaaa--dbb----:1:-1:1:42:0:0:1:0:10
Blue to play 42

1.Rollout18/4 6/4eq: +0.431
 Player:Opponent: 72.87% (G:9.23% B:0.13%)27.13% (G:2.66% B:0.07%) Conf.: ± 0.002 (+0.430...+0.433) - [100.0%]Duration: 26 minutes 21 seconds
2.Rollout113/9 11/9eq: +0.426 (-0.006)
 Player:Opponent: 73.06% (G:7.37% B:0.11%)26.94% (G:2.19% B:0.06%) Conf.: ± 0.002 (+0.424...+0.427) - [0.0%]Duration: 25 minutes 58 seconds
1 15552 Games rolled with Variance Reduction.
Dice Seed: 62360342
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

At DMP the two plays are tied.

 White is Player 2 score: 0 pip: 135 1 point match pip: 126 score: 0 Blue is Player 1
XGID=-a---CD-C--AcDaaa--dbb----:0:0:1:42:0:0:0:1:10
Blue to play 42

1.Rollout18/4 6/4eq: +0.466
 Player:Opponent: 73.31% (G:7.85% B:0.25%)26.69% (G:2.06% B:0.10%) Conf.: ± 0.001 (+0.466...+0.467) - [98.9%]Duration: 1 hour 08 minutes
2.Rollout113/9 11/9eq: +0.465 (-0.001)
 Player:Opponent: 73.26% (G:6.19% B:0.20%)26.74% (G:1.85% B:0.10%) Conf.: ± 0.001 (+0.465...+0.466) - [1.1%]Duration: 1 hour 06 minutes
1 46656 Games rolled with Variance Reduction.
Dice Seed: 62360342
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

A variant.

 White is Player 2 score: 0 pip: 137 Unlimited GameJacoby pip: 126 score: 0 Blue is Player 1
XGID=-a---CD-C--AcDaaa-bbbb----:1:-1:1:42:0:0:1:0:10
Blue to play 42

1.Rollout113/9 11/9eq: +0.449
 Player:Opponent: 73.71% (G:7.77% B:0.09%)26.29% (G:2.12% B:0.06%) Conf.: ± 0.004 (+0.445...+0.453) - [100.0%]Duration: 4 minutes 32 seconds
2.Rollout18/4 6/4eq: +0.439 (-0.011)
 Player:Opponent: 72.86% (G:9.83% B:0.12%)27.14% (G:2.73% B:0.08%) Conf.: ± 0.004 (+0.434...+0.443) - [0.0%]Duration: 4 minutes 20 seconds
1 2592 Games rolled with Variance Reduction.
Dice Seed: 68675974
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

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