Event: B Division

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Opponent	Rating	Result
Michael J Creaney	1713	½ - ½
Jonathan Sams	1743	0 - 1
Brian Whitaker	1570	1 - 0
Ray Honeybourne	1703	1 - 0
Robert Donner	1631	½ - ½
Mike Pointon	1660	½ - ½
Chris Swales	1567	½ - ½

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

1712 = (11587 + 400 * (2 - 1)) / 7)