ABBA sequence in #Tennis tiebreaking serves is proven to be fair

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The “Take a Chance on ABBA” paper examines the ABBA sequence, in which the first two serves between players A and B are mirror images of the next two serves, such that the sequence of the first four serves is ABBA. This order is used to break ties in tennis and is being tested by the International Football Association Board for use in soccer penalty shootouts. The current ABAB sequence used in penalty shootouts was found to be unfair, since it provides the first kicking team a significantly higher probability of winning.

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