Event: Division 2

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Opponent	Rating	Result
Simon Wilks	1943	0 - 1
Simon Webber	1720	1 - 0
Timothy Lunn	1987	0 - 1

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

1750 = (5650 + 400 * (1 - 2)) / 3)