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Opponent Rating Result
Gary Sharp 132 ½ - ½
Kate Walker 134 ½ - ½
Martin E Newman 119 1 - 0
Hunain Malik 106 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

223 = (491 + 400 * (1 - 0)) / 4)

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