Event: City Chess Swiss 2019-20

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Opponent	Rating	Result
Brian Mak	1788	0 - 1
Joseph S Rees	0	1 - 0
Khoria Stewart	0	1 - 0

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

729 = (1788 + 400 * (2 - 1)) / 3)