Event: Eton Rapidplay 2019

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Opponent	Rating	Result
Shazaib Twaseen	108	1 - 0
Easan Gunarajah	139	0 - 1
Raghav Vaidya	123	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

-10 = (370 + 400 * (1 - 2)) / 3)