Event: Div1

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Opponent Rating Result
David G Levens 152 1 - 0
Ian S Kingston 178 ½ - ½
Kenneth GE Morrison 171 0 - 1
Martin Cobham 149 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

263 = (650 + 400 * (2 - 1)) / 4)

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