Event: Hammersmith Rockhammer Cup

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Opponent	Rating	Result
Alexander Royce	1314	0 - 1
Gordon Hall	0	0 - 1
Gordon Hall	0	1 - 0
Luna Eastham	1265	1 - 0
Ljubomir Koncar	1261	0 - 1

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

688 = (3840 + 400 * (2 - 3)) / 5)