Event: 5th Cornwall Online League

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Opponent	Rating	Result
John Constable	1574	1 - 0
Jason Henderson	1704	0 - 1
Simon Margetts	1480	0 - 1

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

1453 = (4758 + 400 * (1 - 2)) / 3)