Event: Open

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Opponent Rating Result
Pelle O Larsen 1985 ½ - ½
Jeremy Fallowfield 2113 0 - 1
Pelle O Larsen 1985 1 - 0
Jeremy Fallowfield 2113 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1949 = (8196 + 400 * (1 - 2)) / 4)

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