Event: Rated club games

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Opponent	Rating	Result
Roy A Ludlow	1584	½ - ½
Bernadette Marie	1150	1 - 0
Roy A Ludlow	1583	1 - 0
David L Weston	1656	0 - 1
Bernadette Marie	1140	1 - 0
Clare Haythornthwaite	1263	1 - 0
Tim F Woodward	1801	0 - 1

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

1568 = (10177 + 400 * (4 - 2)) / 7)