Event: Summer Max 560 Division

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Opponent Rating Result
Derek Backhouse 144 0 - 1
John Grant 111 1 - 0
Derek Backhouse 144 ½ - ½
John Grant 111 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

28 = (510 + 400 * (1 - 2)) / 4)

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