Event: Division Four

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Opponent Rating Result
David Cleak 1571 1 - 0
Adrian Dibble 1476 1 - 0
Mark E Tallis 1638 ½ - ½
Chris W Pitt 1640 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1781 = (6325 + 400 * (2 - 0)) / 4)

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