Event: Goodall Cup

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Opponent	Rating	Result
Masha Visel	1257	1 - 0
Robert Cronin	1478	0 - 1
Fredy Reber	1170	0 - 1

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

1168 = (3905 + 400 * (1 - 2)) / 3)