Event: Dudley & District League Div 3

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Opponent	Rating	Result
Paul Bignall	1481	1 - 0
Phil Dyson	1302	1 - 0
Derek Ellesmore	399	1 - 0
Derek Ellesmore	399	0 - 1
Richard F Collett	1404	0 - 1
Stuart E Wood	1335	1 - 0

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

1187 = (6320 + 400 * (4 - 2)) / 6)