Event: Northamptonshire Silver King League Division 2

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Opponent	Rating	Result
Ross Webster	1594	0 - 1
David P Holmes	1404	0 - 1
Jacob Batchelor	1522	1 - 0

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

1373 = (4520 + 400 * (1 - 2)) / 3)