Event: C Division

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Opponent	Rating	Result
Paul Keech	1774	½ - ½
William O'Rourke	1833	0 - 1
Julian C Clissold	1708	0 - 1
Nathan Harvey-Jones	1686	1 - 0
Borja Diaz-Guardamino	1668	½ - ½
Robin IR Wilding	1795	0 - 1

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

1611 = (10464 + 400 * (1 - 3)) / 6)