Event: AG Sunderland

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Opponent	Rating	Result
Alex Forster	1387	1 - 0
Niks Bisovs	1613	0 - 1
James Rushton	1284	1 - 0

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

1561 = (4284 + 400 * (2 - 1)) / 3)