Event: Challengers

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Opponent	Rating	Result
Stephen Briggs	1671	0 - 1
Luca Parkes	1419	½ - ½
Francisco Cavaco	0	1 - 0

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

1030 = (3090 + 400 * (1 - 1)) / 3)