Event: Summer Rapidplay

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Opponent Rating Result
Michael J Creaney 1649 ½ - ½
Joseph Machin 1391 1 - 0
Geoff Mann 1350 1 - 0
Joe McGinnis 1506 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1574 = (5896 + 400 * (2 - 1)) / 4)

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