Event: D&DCL Div 2

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Opponent	Rating	Result
Martin Pettinger	1728	0 - 1
David Hatton	0	1 - 0
Daniel Blumenow	0	1 - 0

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

709 = (1728 + 400 * (2 - 1)) / 3)