Event: Division 2

Opponent Rating Result
Paul Silverman 1661 0 - 1
David Riley 1639 1 - 0
Omar Khemoudj 1481 ½ - ½
Chris John Evans 1777 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1540 = (6558 + 400 * (1 - 2)) / 4)

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