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Unlimited Games. How should Red play 66?
Despite being down in the race leaving the rear checkers stranded is not the right plan. Equally well, giving up the mid-point would be premature. This eliminates plays such as 13/1(2) or 24/18(2), 13/7(2).
Given these restraints it is not difficult to find 24/18(2), 8/2(2) which solves the problem of the rear checkers and gives Red some flexibility through the new spare checkers on White’s bar-point.
Any play other than 24/18(2), 8/2(2) is a bad error or worse.