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Mine are based on tests with XG

Posted By: Phil Simborg
Date: Monday, 4 September 2017, at 4:02 p.m.

In Response To: Live Cube equity:A root value in BG based on a math axiom (Michael)

With a lot of help from John O'Hagan, I have made and use my own chart for live cube takpoints, based on medium races. For money it is 21.5 which assumes a cube vig of 3.5, which is the difference between 21.5 and the dead cube take point of 25%. Note that is about 68% of the difference between the dead cube take point and the optimum live cube take point shown in XG.

Of course I know that the shorter the race, the higher the take point, and I know non-races and certain types of positions have less cube vig and therefore I mentally adjust higher, but I think this is a good starting place.

In the position below, the taker has just over 21.5 and it is a bare take, and that shows us that at least in this length of race, XG is using something pretty close to 21.5. I have tested my numbers at different scores and get the same, excellent results.





White is Player 2

score: 0
pip: 69
Unlimited Game
Jacoby Beaver
pip: 62
score: 0

Blue is Player 1
XGID=-BBBBCBAA-----a-a-abbbbbb-:0:0:1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in XG Roller++ No double Double/Take
Player Winning Chances: 78.18% (G:0.00% B:0.00%) 78.19% (G:0.00% B:0.00%)
Opponent Winning Chances: 21.82% (G:0.00% B:0.00%) 21.81% (G:0.00% B:0.00%)
Cubeless Equities +0.564 +1.128
Cubeful Equities
No double:+0.839 (-0.146)
Double/Take:+0.985
Double/Pass:+1.000 (+0.015)
Best Cube action: Double / Take

eXtreme Gammon Version: 2.19.211.pre-release

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