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Basic ace deuce backgame cube

Posted By: Bob Koca
Date: Wednesday, 17 July 2013, at 12:30 a.m.

In Response To: Basic ace deuce backgame cube (neilkaz)

It is a much worse position for the backgame defender than what I posted. The cubeless RO shows it as a take even if the cube is dead with the XG+ equity at .489 compared to .619 for my position.

I agree that the advanced straggler is a negative for the backgame player but the 3 extra checkers are a huge plus for him. With 1s, 2s, 5s and 6s playing from the 5 point the 5 point will very likely be empty before the spares on the 3 and 4 are gone so the extra checkers being useful attackers does not add much. But when there is a hit on the 5 point or on the 2 point after a bad two up to 3 fewer checkers have already been borne off.

White is Player 2

score: 0
pip: 160
Unlimited Game
pip: 58
score: 0

Blue is Player 1
Blue on roll, cube action?

Analyzed in Rollout No double Double/Take
Player Winning Chances: 53.521% (G:32.960% B:8.939%) 53.514% (G:32.965% B:8.936%)
Opponent Winning Chances: 46.479% (G:0.005% B:0.000%) 46.486% (G:0.005% B:0.000%)
Cubeless Equities +0.4894 +0.9785
Cubeful Equities
No double:+0.4894 (-0.4891)±0.0073 (+0.4820..+0.4967)
Double/Take:+0.9785±0.0147 (+0.9638..+0.9932)
Double/Pass:+1.0000 (+0.0215)
Best Cube action: Double / Take
Rollout details
1296 Games rolled with Variance Reduction.
Moves: XG Roller+, cube decisions: 1-ply
Double Decision confidence:100.0%
Take Decision confidence:99.8%
Duration: 3 hours 21 minutes

eXtreme Gammon Version: 2.10

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