Event: Internal Rapidplay

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Opponent Rating Result
John Slusar 1880 0 - 1
Chris Braithwaite 1434 1 - 0
Joseph Braithwaite 1354 1 - 0
Paul Mead 1211 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1470 = (5879 + 400 * (2 - 2)) / 4)

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