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What is the Rule of 4?

Posted By: Taper_Mike
Date: Tuesday, 26 November 2013, at 12:26 a.m.

In Response To: what is the Rule of 4? *NM* (Frankie D)

 White is Player 2 score: 0 pip: 145 Unlimited Game pip: 125 score: 0 Blue is Player 1
XGID=----BBCbC---cE--bc-cb-----:0:0:1:00:0:0:0:0:10
Blue on roll, cube action?

 Analyzed in XG Roller++ No double Double/Take Player Winning Chances: 72.438% (G:1.960% B:0.022%) 72.410% (G:1.994% B:0.022%) Opponent Winning Chances: 27.562% (G:1.448% B:0.026%) 27.590% (G:1.478% B:0.026%) Cubeless Equities +0.4538 +0.9066 Cubeful Equities No double: +0.7296 Double/Take: +0.7126 (-0.0170) Double/Pass: +1.0000 (+0.2704) Best Cube action: No double / Take Percentage of wrong pass needed to make the double decision right: 5.6%

eXtreme Gammon Version: 2.10

 White is Player 2 score: 0 pip: 139 Unlimited Game pip: 120 score: 0 Blue is Player 1
XGID=----BBCbD---bD--bcacb-----:0:0:1:00:0:0:0:0:10
Blue on roll, cube action?

 Analyzed in XG Roller++ No double Double/Take Player Winning Chances: 73.635% (G:1.624% B:0.016%) 73.623% (G:1.641% B:0.019%) Opponent Winning Chances: 26.365% (G:1.202% B:0.015%) 26.377% (G:1.208% B:0.015%) Cubeless Equities +0.4769 +0.9537 Cubeful Equities No double: +0.7265 (-0.0424) Double/Take: +0.7689 Double/Pass: +1.0000 (+0.2311) Best Cube action: Double / Take

eXtreme Gammon Version: 2.10

### The Rule of 4

When you hold only your midpoint and 8pt in the outer board, and your opponent is playing a holding game with a single anchor on either the 5pt or the bar point, it is very hard to lose your market. Just about the only sure market losers occur when you are able to clear the midpoint by rolling doublets.

That being the case, it is not necessary to double until you get down to 4 checkers or less on the midpoint.

Mike

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