Event: Tonbridge league

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Opponent Rating Result
Karsten Mok 0 0 - 1
Ben Gardner 0 0 - 1
Suriya Velayudham 106 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-365 = (106 + 400 * (0 - 3)) / 3)

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