Event: u1850 County Championship

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Opponent	Rating	Result
Rowan Kent	1562	½ - ½
Keith Bradley	1643	1 - 0
Michelle Ngo Yu Chan	1726	0 - 1
John WF McAllister	1718	1 - 0
Graham K Blowers	1741	½ - ½
David Willsher	1775	0 - 1

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

1694 = (10165 + 400 * (2 - 2)) / 6)