Event: SCL Div 4

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Opponent	Rating	Result
Stephen P Kitley	0	0 - 1
Richard J Meredith	0	0 - 1
Daniel Zelinka	0	½ - ½
Lewis Jackson	0	1 - 0
Sammy Rebdi	0	0 - 1

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

-160 = (0 + 400 * (1 - 3)) / 5)