Event: Division A

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Opponent Rating Result
Tom Ormisher 1579 1 - 0
Armand Catz 1799 0 - 1
Tony Byrne 1487 ½ - ½
Ronnie Whiteside 1733 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1650 = (6598 + 400 * (1 - 1)) / 4)

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