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MCG RefPos from an old Gammon Village article

Posted By: ah_clem
Date: Monday, 23 September 2024, at 9:20 p.m.

In Response To: MCG RefPos from an old Gammon Village article (Timothy Chow)

All three of those have 18 pips of timing and are borderline takes according to XGR++.

So, it appears 18 is the magic number for the take/pass decision.

When does the doubling window open (or close, if you want to think about it chronologically)?

That doesn't seem to be so simple. Position A is a cube with only 7 pips of timing, but position B isn't quite a cube with eight. But a doubling window of 8-18 is probably good enough for my purposes, assuming I can remember any of this.

A





White is Player 2

score: 0
pip: 83
Unlimited Game
Jacoby Beaver
pip: 75
score: 0

Blue is Player 1
XGID=aBBBCCB------------ccccbA-:1:1:1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in XG Roller++ No redouble Redouble/Take
Player Winning Chances: 63.73% (G:1.83% B:0.02%) 63.96% (G:1.67% B:0.01%)
Opponent Winning Chances: 36.27% (G:2.02% B:0.05%) 36.04% (G:1.94% B:0.04%)
Cubeless Equities +0.272 +0.552
Cubeful Equities
No redouble:+0.351 (-0.017)
Redouble/Take:+0.368
Redouble/Pass:+1.000 (+0.632)
Best Cube action: Redouble / Take

eXtreme Gammon Version: 2.10

B





White is Player 2

score: 0
pip: 83
Unlimited Game
Jacoby Beaver
pip: 76
score: 0

Blue is Player 1
XGID=aBBCBBBA-----------ccccbA-:1:1:1:00:0:0:3:0:10
Blue on roll, cube action?

Analyzed in XG Roller++ No redouble Redouble/Take
Player Winning Chances: 63.74% (G:1.68% B:0.01%) 63.92% (G:1.58% B:0.01%)
Opponent Winning Chances: 36.26% (G:2.80% B:0.07%) 36.08% (G:2.80% B:0.06%)
Cubeless Equities +0.263 +0.531
Cubeful Equities
No redouble:+0.356
Redouble/Take:+0.328 (-0.028)
Redouble/Pass:+1.000 (+0.644)
Best Cube action: No redouble / Take
Percentage of wrong pass needed to make the double decision right: 4.0%

eXtreme Gammon Version: 2.10

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