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Money Play. How should Red play 31?
One blot, two blots or four blots?
One blot is the weakest play. 8/7*/4 leaves Red with too much work to do.
8/7*, 5/2 is the halfway house play, leaving only 61 and 62 to hit. That play is an error but not a blunder.
13/10, 8/7* leaves seven shots. Is the risk worth the reward? Yes, because if White fans Red will have a perfectly correct redouble that White will accept. That makes all the difference, especially as Red will win a gammon 16% of the time and scoop eight points.