Event: Division 2

Opponent Rating Result
David snr Stanfield 1652 1 - 0
Andrei Tamboi 1577 0 - 1
Alan Jackson 1597 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1609 = (4826 + 400 * (1 - 1)) / 3)

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