Event: SCCA Division 3 19/20

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Opponent	Rating	Result
Trevor Wright	75	0 - 1
Roger N Smith	86	0 - 1
James Stow	57	1 - 0

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

-61 = (218 + 400 * (1 - 2)) / 3)