Event: Open

Opponent Rating Result
Patrick CM Duncan 2170 ½ - ½
John E Crump 1983 ½ - ½
Patrick CM Duncan 2170 1 - 0
John E Crump 1983 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2277 = (8306 + 400 * (2 - 0)) / 4)

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