Event: Division 1

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Opponent Rating Result
Paul Leonard 1624 ½ - ½
John C Skipworth 1535 1 - 0
Leo Cheung 1310 ½ - ½
Graham Peters 1329 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1650 = (5798 + 400 * (2 - 0)) / 4)

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