Event: Open

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Opponent Rating Result
Nicholas A Walker 1960 ½ - ½
Patrick CM Duncan 2170 0 - 1
Nicholas A Walker 1960 ½ - ½
Patrick CM Duncan 2170 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1865 = (8260 + 400 * (0 - 2)) / 4)

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