Event: Hammersmith Rockhammer Cup

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Opponent	Rating	Result
Frank Valle	1503	0 - 1
Jon Mather	1567	0 - 1
Vincent Horovitz	0	0 - 1

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

623 = (3070 + 400 * (0 - 3)) / 3)