Event: EJCOA South Yorkshire U16/U14/U12

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Opponent	Rating	Result
Felix Lee	1118	0 - 1
Anna McKenna	784	0 - 1
Oscar Yan	1152	0 - 1
Lysander Lawson	1243	½ - ½

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

774 = (4297 + 400 * (0 - 3)) / 4)