Event: Summer Rapidplay

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Opponent	Rating	Result
Geoff Mann	1350	1 - 0
Chris Swales	1721	0 - 1
Michael J Creaney	1649	0 - 1

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

1440 = (4720 + 400 * (1 - 2)) / 3)