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SpeedGammon! What now?

Posted By: Stick
Date: Saturday, 3 November 2012, at 3:10 p.m.

In Response To: SpeedGammon! What now? (Keene)

Trapping here is wrong for a few reasons, one of them being the more than halved gammon value. The other is the vulnerability of your back checker still being back combined with the fact your opponent has a 3pt board still that is capable of turning into a 4pt board. One 'always' traps when the opponent has a 1 or a 2 point board. When they have a 3 point board it depends on other factors. Here are a couple simple examples with a normal gammon value displaying these differences.

Original for money
White is Player 2

score: 0
pip: 85
Unlimited Game
Jacoby Beaver
pip: 109
score: 0

Blue is Player 1
XGID=--bBBBCBB----A-------dedA-:2:-1:1:11:0:0:3:0:10
Blue to play 11
1.XG Roller++13/9eq: +0.839
Player:
Opponent:		87.16% (G:14.05% B:0.34%)
12.84% (G:0.28% B:0.01%)
2.XG Roller++13/12 7/6 7/5eq: +0.748 (-0.092)
Player:
Opponent:		80.73% (G:21.50% B:0.89%)
19.27% (G:2.29% B:0.04%)

Back checker moved up variant
White is Player 2

score: 0
pip: 85
Unlimited Game
Jacoby Beaver
pip: 105
score: 0

Blue is Player 1
XGID=--bBBBCBB----A------Aded--:2:-1:1:11:0:0:3:0:10
Blue to play 11
1.XG Roller++13/12 7/6 7/5eq: +0.819
Player:
Opponent:		84.09% (G:20.40% B:0.60%)
15.91% (G:1.55% B:0.03%)
2.XG Roller++13/9eq: +0.804 (-0.015)
Player:
Opponent:		86.35% (G:12.55% B:0.29%)
13.65% (G:0.37% B:0.01%)

Two point board variant
White is Player 2

score: 0
pip: 78
Unlimited Game
Jacoby Beaver
pip: 109
score: 0

Blue is Player 1
XGID=--bBBBCBB----A--------fgA-:2:-1:1:11:0:0:3:0:10
Blue to play 11
1.XG Roller++13/12 7/6 7/5eq: +0.970
Player:
Opponent:		87.40% (G:26.53% B:0.94%)
12.60% (G:1.12% B:0.02%)
2.XG Roller++13/9eq: +0.930 (-0.040)
Player:
Opponent:		88.04% (G:20.89% B:0.66%)
11.96% (G:0.51% B:0.01%)

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