Event: Hillingdon Div 3

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Opponent	Rating	Result
James Lyons	1598	0 - 1
Jagat Singh	1449	0 - 1
Abu Hasan	1426	1 - 0

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

1358 = (4473 + 400 * (1 - 2)) / 3)