Event: Hammersmith Rockhammer Cup

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Opponent	Rating	Result
Andrew Macleod	1791	0 - 1
Tom Townsend	2071	0 - 1
John Davison	1506	1 - 0
Ceferino Gonzales	1615	1 - 0
Christopher Skulte	2023	0 - 1
Alexander Royce	1362	1 - 0
Tristan Kozlowski	0	1 - 0

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

1538 = (10368 + 400 * (4 - 3)) / 7)