Event: Division One

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Opponent Rating Result
Ewan Wilson 2142 0 - 1
Mark Payne 1813 ½ - ½
Mark Payne 1788 1 - 0
Daniel Shek 1918 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1915 = (7661 + 400 * (1 - 1)) / 4)

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