Event: Dudley & District League Div 2

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Opponent	Rating	Result
Mark A Drugan	1742	½ - ½
David Waud	1744	½ - ½
Joshua Skyrme	1528	0 - 1
Geoffrey C Rosser	1647	0 - 1
Steve A Edwards	1752	0 - 1
Brandon Wilkes	450	1 - 0
Muhammed Mehmood	1327	1 - 0

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

1399 = (10190 + 400 * (2 - 3)) / 7)