Event: Cobham

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Opponent Rating Result
Edo Zambeli 0 0 - 1
Francesco Petrini 0 0 - 1
Tharul Cooray 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-400 = (0 + 400 * (0 - 3)) / 3)

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