Event: Division 3

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Opponent Rating Result
Michael A Lee 138 0 - 1
John Y Yee 135 ½ - ½
Philip N Birks 142 1 - 0
Andrew Barker 123 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

235 = (538 + 400 * (2 - 1)) / 4)

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