Event: Division One

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Opponent Rating Result
Gary Senior 191 ½ - ½
Richard J McMichael 207 ½ - ½
R Cumming 208 0 - 1
Ravi Haria 247 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

13 = (853 + 400 * (0 - 2)) / 4)

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