Event: Ivan Gromov League Season 2

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Opponent	Rating	Result
Will Laver	0	0 - 1
Sam Machin-Gray	0	0 - 1
Arina Redina	0	0 - 1
Zi Jian Tang	0
Danwei Liu	0	1 - 0

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

-200 = (0 + 400 * (1 - 3)) / 4)