Event: Dave Nicholas Summer League

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Opponent Rating Result
Alun Richards 151 1 - 0
David A Walton 135 0 - 1
Alun Richards 151 ½ - ½
David A Walton 135 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

243 = (572 + 400 * (2 - 1)) / 4)

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