Event: E Division

Opponent Rating Result
Marcus Fung 1713 ½ - ½
Stuart Sumner 1537 ½ - ½
Marcus Fung 1713 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1788 = (4963 + 400 * (1 - 0)) / 3)

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