Event: Beverley Club Championship

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Opponent Rating Result
J Gerry Johnstone 120 1 - 0
Michael C Hackett 127 ½ - ½
Peter T Perkins 118 ½ - ½
Thomas L Hackett 134 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

125 = (499 + 400 * (1 - 1)) / 4)

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