Event: Ladder (Rapid)

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Opponent	Rating	Result
Robert L Jones	146	0 - 1
Greg Hart	62	1 - 0
Jonathan L Collins	154	0 - 1
Raf Calumpiano	58	0 - 1
Robert Lepley	93	1 - 0
Robert L Jones	146	1 - 0
James Pack	159	0 - 1

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

60 = (818 + 400 * (3 - 4)) / 7)