Event: Hartley

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Opponent	Rating	Result
Charlie Locke	1143	0 - 1
Des Lougheed	820	1 - 0
Aram Marsh	1495	0 - 1

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

1019 = (3458 + 400 * (1 - 2)) / 3)