Event: Division 2

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Opponent Rating Result
Peter J Leary 1810 0 - 1
Michael WA Hoare 1683 1 - 0
Chris M Cox 1593 ½ - ½
Robert J Edgar 1713 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1800 = (6799 + 400 * (2 - 1)) / 4)

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