Event: Division 2

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Opponent Rating Result
Michael Cain 139 1 - 0
Andrew J Briggs 169 ½ - ½
Henry Cove 164 0 - 1
Ian S Comley 154 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

257 = (626 + 400 * (2 - 1)) / 4)

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