Event: Division 2

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Opponent Rating Result
Andy Johnson 1616 1 - 0
Andrew Collins 1791 ½ - ½
Robert J Purcell 1741 1 - 0
Rod Webb 1696 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1911 = (6844 + 400 * (2 - 0)) / 4)

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