Event: Division 3 Rapidplay Cup

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Opponent Rating Result
David Robertson 1619 1 - 0
David Robertson 1619 0 - 1
James Waters 1550 0 - 1
James Waters 1550 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1385 = (6338 + 400 * (1 - 3)) / 4)

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