Event: OTB rapid games

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Opponent	Rating	Result
Ivy Piatt	0	½ - ½
James M G Toon	0	0 - 1
Beau Darrer	0	0 - 1

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

-267 = (0 + 400 * (0 - 2)) / 3)