Event: AG Sunderland

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Opponent	Rating	Result
David Firth	1420	0 - 1
Jonathan R Slater	1685	1 - 0
Richard White	1592	0 - 1

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

1432 = (4697 + 400 * (1 - 2)) / 3)