Event: Division 1

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Opponent Rating Result
Peter D Rooney 2050 0 - 1
Charlie Wainwright 1789 ½ - ½
Lee Crawford 1851 0 - 1
Fazal Rabbi 1697 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1747 = (7387 + 400 * (1 - 2)) / 4)

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