Event: Unsructured Individual Event

Opponent Rating Result
Graham J Ashcroft 163 ½ - ½
Graham J Ashcroft 163 0 - 1
Becky Kerton 124 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

17 = (450 + 400 * (0 - 1)) / 3)

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