Event: Week 3

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Opponent	Rating	Result
David Millington	1612	0 - 1
Daniel Watt	1100	0 - 1
Callum M Kirk	1000	1 - 0

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

1104 = (3712 + 400 * (1 - 2)) / 3)