Event: Northamptonshire Silver King League

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Opponent	Rating	Result
Greg Rynkowski	0	0 - 1
Joe Houghton	0	0 - 1
Aaron Lee	0	0 - 1
Vijay Lad	0	0 - 1
Alistair Mair	0	1 - 0
Kirk Harrison	0	0 - 1

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

-267 = (0 + 400 * (1 - 5)) / 6)