4 Card Trick
Haven's Solution is perfect for the 3 card game. What is the solution for the 4 card game? If your opponent chooses RBRB should you choose RRBR or BRBR? Both RRBR and BRBR obey Haven's rule:
make the first 3 of his choice the last 2 of yours - AND - never choose a palindromic set for your response.
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