Event: Durham League Division B

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Opponent Rating Result
Stephen Carter 1572 0 - 1
Richard Evans 0 1 - 0
Chris Clynes 1559 1 - 0
John Marsden 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

983 = (3131 + 400 * (3 - 1)) / 4)

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