Event: Central London Qualifier

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Opponent	Rating	Result
Lewis Zheng	0	1 - 0
Elijah Msimbira	0	1 - 0
Anwen Song	1668	0 - 1

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

689 = (1668 + 400 * (2 - 1)) / 3)