Event: Division One

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Opponent Rating Result
Shahab U Quraishi 159 ½ - ½
David M Cooper 170 ½ - ½
Richard W Smith 172 ½ - ½
Sean Ralph 162 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

266 = (663 + 400 * (1 - 0)) / 4)

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