Event: U1640 Tournament

Opponent Rating Result
John Scotter 1537 ½ - ½
John Scotter 1537 1 - 0
Stuart Sharp 1405 1 - 0
Sean Smith 1528 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1602 = (6007 + 400 * (2 - 1)) / 4)

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