Event: Division Two

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Opponent Rating Result
Alan H Perkins 198 0 - 1
John D White 145 ½ - ½
Paul Kennelly 159 0 - 1
Vincent Sagues 176 ½ - ½
Chris J Todd 172 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

90 = (850 + 400 * (1 - 2)) / 5)

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