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Live Cube TP (Gammonless / Match)

Posted By: Jeremy Bagai
Date: Thursday, 5 June 2014, at 2:12 a.m.

In Response To: Live Cube TP (Gammonless / Match) (Timothy Chow)

Taking money play as an example:

Dead Cube TP = 25%. (Assumes no future cube use.)
Live Cube TP = 20%. (Assumes perfect subsequent recubes for both players.)

But what's the actual take point for a given position? Somewhere between the Dead Cube and the Live Cube values. Chuck and John estimate 70% of the way from Dead to Live. But it depends on the position.

And there's always the possibility that the real take point will be even lower than the Live Cube TP -- if the taker will get good recube efficiency but the subsequent taker will not. That's why you can take in the following (famous) position with only 18.75%:





White is Player 1

score: 0
pip: 6
Unlimited Game
Jacoby Beaver
pip: 6
score: 0

Blue is Player 2
XGID=------A------------a------: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: 81.25% (G:0.00% B:0.00%) 81.25% (G:0.00% B:0.00%)
Opponent Winning Chances: 18.75% (G:0.00% B:0.00%) 18.75% (G:0.00% B:0.00%)
Cubeless Equities +0.625 +1.250
Cubeful Equities
No double:+0.500 (-0.500)
Double/Take:+1.000
Double/Pass:+1.000
Best Cube action: Double / Take

eXtreme Gammon Version: 2.10


Blue doubles. If he misses, White has an optimal recube. But when White misses, no more recube equity for Blue.
But this is pretty rare. Almost always, true take point will be between Dead Cube and Live Cube.

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