Event: Hartley

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Opponent	Rating	Result
Harry H Altoft	1437	1 - 0
Con Carey	1518	½ - ½
David F Newell	1796	0 - 1

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

1584 = (4751 + 400 * (1 - 1)) / 3)