Event: Division 5

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Opponent Rating Result
James Charlton 1642 1 - 0
Richard Oxnard 1574 ½ - ½
David Walshaw 1677 0 - 1
Ethan Tatters 1661 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1539 = (6554 + 400 * (1 - 2)) / 4)

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