Event: Division 2

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Opponent	Rating	Result
Harvey Craddock-Monroe	1552	½ - ½
Jon M Griffiths	1829	½ - ½
Alan Eley	1503	1 - 0
David Riley	1611	0 - 1
Jon A Asbury	1580	½ - ½
Daniel Xingyu Chen	1831	½ - ½
Fred S Dickson	1597	½ - ½

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

1643 = (11503 + 400 * (1 - 1)) / 7)