Event: Christmas Rapid

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Opponent Rating Result
Lenny Horn 744 1 - 0
Raf Calumpiano 1311 ½ - ½
Robert L Jones 1720 1 - 0
Judith Heffer 1876 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1613 = (5651 + 400 * (2 - 0)) / 4)

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