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Opponent Rating Result
Yogit Senthilnathan 180 0 - 1
Nigel J Moyse 178 ½ - ½
Clive A Frostick 194 0 - 1
David A Cox 166 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

80 = (718 + 400 * (1 - 2)) / 4)

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