Event: York Club Championship

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Opponent	Rating	Result
Herbert Lockwood	1631	0 - 1
Toby Conyers-Kelly	1244	1 - 0
Derek Toyne	1598	0 - 1
Philippe Radault	1588	1 - 0
Paul W Jones	1634	1 - 0
Stephen Donkin	1549	0 - 1
Daniel Meredith	1722	0 - 1
John Foo	1496	1 - 0

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

1558 = (12462 + 400 * (4 - 4)) / 8)