Event: u1850 County Championship

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Opponent	Rating	Result
Ben Yelverton	1730	0 - 1
Patrick Fitzgerald	1733	½ - ½
Charles J Richmond	1592	½ - ½
Graham K Blowers	1732	0 - 1
John Baguley	1729	½ - ½
Robert L Jones	1674	0 - 1

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

1498 = (10190 + 400 * (0 - 3)) / 6)