Event: Open

Opponent Rating Result
Anthony Sadler 149 1 - 0
Phil Bull 159 1 - 0
Nigel S Towers 162 0 - 1
Anthony Sadler 149 0 - 1
Phil Bull 159 0 - 1
Nigel S Towers 162 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

23 = (940 + 400 * (2 - 4)) / 6)

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