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Unlimited Games. How should Red play 33?
Two of the threes are easy, bar/22 and 6/3.
The choice is between 21/18(2) and 13/10(2) for the other two threes.
21/18(2) risks a blitz but keeps connectivity. 13/10(2) strands the rear checkers and sixes next turn could be a problem. All of this adds up to bar/22, 21/18(2), 6/3 being the correct play. He other play is a 1.5 blunder.