Event: U1800 Cup

Opponent Rating Result
Simon Webber 1709 1 - 0
Angus Irving 1780 0 - 1
Graeme Jones 1722 0 - 1
Simon Riley 1710 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1630 = (6921 + 400 * (1 - 2)) / 4)

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