Event: Division Two

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Opponent Rating Result
John Mildenhall 159 0 - 1
Robert Grimes 141 1 - 0
Stephen M Chadaway 139 ½ - ½
Geoffrey N Stokes 132 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

43 = (571 + 400 * (1 - 2)) / 4)

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