Event: Open

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Opponent Rating Result
Eduardo Sanchez 148 0 - 1
Nigel Byrne 139 1 - 0
Eduardo Sanchez 148 0 - 1
Nigel Byrne 139 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

144 = (574 + 400 * (2 - 2)) / 4)

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