Event: Hammersmith Sledgehammer Cup

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Opponent	Rating	Result
Paul van Kan	1698	1 - 0
Charles Rigby	1463	0 - 1
Charles Rigby	1470	0 - 1

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

1410 = (4631 + 400 * (1 - 2)) / 3)