Event: Division 2

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Opponent Rating Result
David Williams 1734 1 - 0
Gareth Ellis 1812 0 - 1
Mark LJ Spriggs 1699 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1748 = (5245 + 400 * (1 - 1)) / 3)

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