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XG+ (Coka-Position D/T - 66 - too good to Redouble)

Posted By: Christian Plenz
Date: Saturday, 19 May 2012, at 4:11 p.m.

This position may habe been discussed here before but I could not find it.

browsing through the London Open results I found this position

http://montecarlobg.blogspot.co.uk/2011/09/koca-position-2-away-4-away-correct-dt.html

A 3-ply rolout comes to the wrong conclusion here. Surprisingly to me XGR+ came out with the correct Double/Take advice. Can anyone explain what calculation Extremegammon is doing? If I click on XG+ for the cube decision on which ply does it look for the 21 rolls (on 2- and 3-ply it won't consider the position too good after 66) and even a 3-ply cube and checker-play Rollout comes to the wrong initial Double/Pass.

I always thought that a 3-ply Rollout is superior to XGR+ but maybe I am wrong. I remember Phil Simborg advicing something like XGR+(+) is always the best and you dont need any more Rollouts





White is Player 2

score: 1
pip: 104
5 point match
pip: 94
score: 3

Blue is Player 1
XGID=a---BDEAAA--Aaa---accbba--:0:0:1:00:3:1:0:5:10
Blue on roll, cube action?

Analyzed in XG Roller+ No double Double/Take
Player Winning Chances: 79,05% (G:6,60% B:0,17%) 80,12% (G:7,55% B:0,26%)
Opponent Winning Chances: 20,95% (G:1,72% B:0,05%) 19,88% (G:1,84% B:0,08%)
Cubeless Equities +0,678 +1,717
Cubeful Equities
No double:+0,831 (-0,094)
Double/Take:+0,925
Double/Pass:+1,000 (+0,075)
Best Cube action: Double / Take

eXtreme Gammon Version: 2.02, MET: Kazaross XG2

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