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Cube Action? (No Jacoby)

Posted By: Colin Owen
Date: Wednesday, 8 October 2025, at 3:47 p.m.

In Response To: Cube Action? (No Jacoby) (Colin Owen)

I encountered this position after 15 moves from each side, then a 52 played bar/18 by XG. Not too far off perfect play (2 errors from me, totalling .055) and no cubes missed (all would have been beavers).

As to why I play XG 'no Jacoby, beaver', you learn more about positions without the Jacoby rule, which relates, therefore, to most fairly even match scores; and if I give a cube that is a beaver I want the bot to spell it out to me!

I include a RO with the Jacoby rule for comparison. It surprises me that this is a much clearer ND. (In practice, it is surely a cube either way!)





White is XG Roller++

score: 0
pip: 128
Unlimited Game
Beaver
pip: 96
score: 0

Blue is Colin G. Owen
XGID=-BBBBbBaA-b--BA-A--bbbbb--:0:0:1:00:0:0:2:0:10
Blue on roll, cube action?

Analyzed in Rollout No double Double/Take
Player Winning Chances: 62.327% (G:20.157% B:0.128%) 62.806% (G:19.903% B:0.103%)
Opponent Winning Chances: 37.673% (G:10.187% B:0.713%) 37.194% (G:10.525% B:0.745%)
Cubeless Equities +0.3404 +0.6870
Cubeful Equities
No double:+0.5012±0.0012 (+0.5001..+0.5024)
Double/Take:+0.4847 (-0.0165)±0.0020 (+0.4827..+0.4867)
Double/Pass:+1.0000 (+0.4988)
Best Cube action: No double / Take
Percentage of wrong pass needed to make the double decision right: 3.1%
Rollout details
46656 Games rolled with Variance Reduction.
Dice Seed: 35273442
Moves: 3-ply, cube decisions: XG Roller
Double Decision confidence:100.0%
Take Decision confidence:100.0%
Duration: 30 minutes 24 seconds

eXtreme Gammon Version: 2.10
White is Player 2

score: 0
pip: 128
Unlimited Game
Jacoby Beaver
pip: 96
score: 0

Blue is Player 1
XGID=-BBBBbBaA-b--BA-A--bbbbb--:0:0:1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in Rollout No double Double/Take
Player Winning Chances: 62.233% (G:19.602% B:0.148%) 62.807% (G:19.910% B:0.102%)
Opponent Winning Chances: 37.767% (G:9.763% B:0.649%) 37.193% (G:10.509% B:0.752%)
Cubeless Equities +0.3380 +0.6873
Cubeful Equities
No double:+0.5344±0.0011 (+0.5332..+0.5355)
Double/Take:+0.4868 (-0.0476)±0.0020 (+0.4848..+0.4888)
Double/Pass:+1.0000 (+0.4656)
Best Cube action: No double / Take
Percentage of wrong pass needed to make the double decision right: 8.5%
Rollout details
46656 Games rolled with Variance Reduction.
Dice Seed: 68885648
Moves: 3-ply, cube decisions: XG Roller
Double Decision confidence:100.0%
Take Decision confidence:100.0%
Duration: 25 minutes 36 seconds

eXtreme Gammon Version: 2.10

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