Event: SCL Div 2

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Opponent Rating Result
Simon Lawrence 1618 1 - 0
Joseph A Coburn 1810 0 - 1
Steven Edwin Jones 1698 0 - 1
Matthew Coldwell 1744 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1618 = (6870 + 400 * (1 - 2)) / 4)

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