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21$-43 129,600 Rollout Result Posted

Posted By: Paul Weaver
Date: Thursday, 25 July 2013, at 6:31 p.m.

This position recently came up in an online money game. I noticed that XG's opening book had a 5184 rollout result that had S (24/20* 13/10) better than U (24/20* 24/21) by 0.002. I was skeptical, so I did a longer rollout.

Before Jellyfish came out in 1994, I never saw anyone play U. I have been playing U in this position since I first learned of the Jellyfish rollout result sometime in the late 1990s.

I am guessing that U is best at DMP and Gammon Save; S is best at Gammon Go. In the absence of rollout results to the contrary, I would always play U when not trailing in a match. I might also play U when trailing by only one point. I would probably play S when trailing by more than one point.





White is Player 2

score: 0
pip: 164
Unlimited Game
Jacoby Beaver
pip: 167
score: 0

Blue is Player 1
XGID=-b----E-C---dEa--c-da---B-:0:0:1:34:0:0:3:0:10
Blue to play 34

1.Rollout124/21 24/20* eq: +0.156
Player:
Opponent:		52.89% (G:16.53% B:1.11%)
47.11% (G:11.87% B:0.48%)		Conf.: ± 0.002 (+0.155...+0.158) - [100.0%]
Duration: 15 hours 59 minutes
2.Rollout124/20* 13/10eq: +0.150 (-0.006)
Player:
Opponent:		52.62% (G:17.15% B:1.18%)
47.38% (G:12.02% B:0.56%)		Conf.: ± 0.002 (+0.148...+0.152) - [0.0%]
Duration: 15 hours 51 minutes
1 129600 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller

eXtreme Gammon Version: 2.10

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