Event: SCL Div 5

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Opponent Rating Result
John E Davis 1409 ½ - ½
John Pellegrini 1283 0 - 1
Ian D Parker 1135 0 - 1
Geoff Parish 1127 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1139 = (4954 + 400 * (1 - 2)) / 4)

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