Event: Division 2

Opponent Rating Result
David Welsh 1544 ½ - ½
Simon Webber 1701 0 - 1
Robert Kent 1538 1 - 0
John A Feavyour 1840 ½ - ½
Alonso Paez 1576 ½ - ½
Piotr Dolewka 1532 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1689 = (9731 + 400 * (2 - 1)) / 6)

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