Event: Div3

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Opponent Rating Result
Graham J Pace 127 0 - 1
Roger W Walker 115 1 - 0
Duncan J Livsey 129 0 - 1
J Martin Gibson 62 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

108 = (433 + 400 * (2 - 2)) / 4)

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