Event: Open

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Opponent Rating Result
Ben Graff 1839 ½ - ½
Martin D Smyth 1975 0 - 1
Ben Graff 1839 ½ - ½
Martin D Smyth 1975 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1707 = (7628 + 400 * (0 - 2)) / 4)

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