Event: Division 2

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Opponent Rating Result
John Knowles 1567 1 - 0
C Rodney S Mitchinson 1211 ½ - ½
Roger R Pearson 1022 1 - 0
Will Orpin 971 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1393 = (4771 + 400 * (2 - 0)) / 4)

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