Event: Hepolite (Rapid Play)

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Opponent	Rating	Result
Les Johnson	127	1 - 0
Les Johnson	127	1 - 0
Peter Shaw	208	0 - 1
Peter Shaw	208	0 - 1

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

168 = (670 + 400 * (2 - 2)) / 4)