Event: Division 3

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Opponent Rating Result
Rob Jarvis 1635 0 - 1
Peter W Gorecka-Marshall 1736 ½ - ½
David Griffiths 1585 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1385 = (4956 + 400 * (0 - 2)) / 3)

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