Event: Rated club games

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Opponent Rating Result
Bernadette Marie 1025 ½ - ½
Steven J Harding 1779 0 - 1
Bernadette Marie 1110 ½ - ½
Hamish Simpson 1243 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1189 = (5157 + 400 * (0 - 1)) / 4)

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