Event: D&DCL Div 4

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Opponent	Rating	Result
Michael D Boreham	130	½ - ½
Chris Sharp	100	0 - 1
Matthew Caswell	120	½ - ½

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

-17 = (350 + 400 * (0 - 1)) / 3)