Event: Div3

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Opponent Rating Result
Ric Dawson 0 0 - 1
Ronald S Harrison 121 ½ - ½
Sam Clayton 116 0 - 1
Ric Dawson 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-41 = (237 + 400 * (1 - 2)) / 4)

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