Event: Dudley & District League Div 2

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Opponent	Rating	Result
Callum Wyman	450	1 - 0
Peter L Loach	1652	0 - 1
Bradley Vanian	450	1 - 0
Mark Riley	1687	½ - ½
Kevin J Spillane	1665	1 - 0
Alan Preece	1701	½ - ½
Donald Billows	1296	½ - ½

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

1386 = (8901 + 400 * (3 - 1)) / 7)