Event: Hepolite (Rapid Play)

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Opponent	Rating	Result
Derek Ludlam	0	½ - ½
Derek Ludlam	0	½ - ½
Mark D Crowther	184	0 - 1
Mark D Crowther	184	0 - 1

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

-108 = (368 + 400 * (0 - 2)) / 4)