Event: Open

Opponent Rating Result
Dave M Davies 150 1 - 0
John F Fahy 152 1 - 0
Dave M Davies 150 0 - 1
John F Fahy 152 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

351 = (604 + 400 * (3 - 1)) / 4)

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