Event: Summer Rapidplay

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Opponent Rating Result
Joseph Machin 1391 0 - 1
Michael J Creaney 1649 0 - 1
Chris Swales 1721 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1187 = (4761 + 400 * (0 - 3)) / 3)

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