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Unlimited Games. How should Red play 51?
Despite White’s two home board blots there is no need to overcomplicate things here.
11/6, 9/8 puts checkers in useful positions. 13/8, 9/8 makes an unwieldy stack on the 8-pt, and 11/10, 11/6 is an unnecessary overplay.
9/3 puts a checker in the wrong place and is far too conservative. It is also a big blunder.