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OTB & RO

Posted By: John O'Hagan
Date: Thursday, 27 August 2015, at 2:05 p.m.

In Response To: 4a-3a cube action (John O'Hagan)

XG doubled me here and I passed. The gammon values heavily favor the trailer ATS by .97 to .45 and the leader's recube vig is somewhat reduced as well. A good way to estimate g's and bg's in many positions is to compare it to the opening position. If you put yourself on roll in the opening position, you're ~ a 55/45 fav with 15% g's/bg's (so about 27% of your wins are g's/bg's). It's clear that 1)White wins more than 55% here and 2)that > 27% of his wins will be g's or bg's since he almost has his 5-point and Black has 4 men back. How much greater? OTB, I figured 1) was in the low 60s and 2) was about 40%. Plugging these into the gammon-adjusted tp formula gives a tp of about 48% then deduct .45 of my own g's and a few percent for cube vig gives a true tp in the low 40s. I figured I couldn't win that often and the RO agrees.

is Player 2

score: 2
pip: 191
5 point match
pip: 141
score: 1

is Player 1
XGID=-baa-AE-D--AcCa--c-d----A-:0:0:1:00:1:2:0:5:10
on roll, cube action?

Analyzed in Rollout No double Double/Take
Player Winning Chances: 62.14% (G:26.97% B:4.01%) 62.10% (G:26.59% B:9.87%)
Opponent Winning Chances: 37.86% (G:7.23% B:0.52%) 37.90% (G:7.26% B:0.80%)
Cubeless Equities +0.496 +1.423
Cubeful Equities
No double:+0.912 (-0.088)±0.018 (+0.895..+0.930)
Double/Take:+1.148 (+0.148)±0.031 (+1.117..+1.179)
Double/Pass:+1.000
Best Cube action: Double / Pass
Rollout details
1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller
Double Decision confidence:100.0%
Take Decision confidence:100.0%
Duration: 38 minutes 33 seconds

eXtreme Gammon Version: 2.00, MET: Kazaross XG2

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