Event: Northamptonshire Silver King League Division 2

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Opponent	Rating	Result
Antonio Mura	1762	0 - 1
Ethan Rowe	1764	0 - 1
Ethan Rowe	1691	0 - 1
Ron Cooper	1512	1 - 0

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

1482 = (6729 + 400 * (1 - 3)) / 4)