Event: Open

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Opponent	Rating	Result
Matthew J Harborne	185	½ - ½
Daniel M Lambourne	188	0 - 1
David R Thomas	154	1 - 0
Kevin Hurney	193	1 - 0
Matthew J Harborne	185	½ - ½
Daniel M Lambourne	188	1 - 0
David R Thomas	154	1 - 0
Kevin Hurney	193	1 - 0

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

380 = (1440 + 400 * (5 - 1)) / 8)