Event: SCL Div 3

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Opponent	Rating	Result
Keith R Bateman	0	0 - 1
Robin Atkins	0	½ - ½
Dave J Elliott	0	0 - 1
Robin Atkins	0	½ - ½
Ivan Stipcevic	0	0 - 1

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

-240 = (0 + 400 * (0 - 3)) / 5)