Event: Beverley Club Championship

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Opponent Rating Result
Douglas Vleeshhouwer 172 0 - 1
David J Gibson 113 1 - 0
Derek A Sheppard 135 ½ - ½
Bruce R Oliver 134 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

239 = (554 + 400 * (2 - 1)) / 4)

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