Event: U1800 Cup

Opponent Rating Result
Bernard Ross 1203 0 - 1
Piotr Dolewka 1510 1 - 0
Mark Heffer 1698 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1337 = (4411 + 400 * (1 - 2)) / 3)

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