Event: SCL Div 1

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Opponent	Rating	Result
Keith DF Gregory	0	0 - 1
Martin J Simons	0	0 - 1
Paul Hackman	0	½ - ½
Russell M Pegg	0	0 - 1
Edoardo Manino	0	1 - 0

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

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