Event: Hammersmith Rockhammer Cup

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Opponent	Rating	Result
Harry O'Neill	1848	1 - 0
Gordon Hall	0	1 - 0
Andrew Macleod	1791	0 - 1
Harry O'Neill	1381	1 - 0

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

1455 = (5020 + 400 * (3 - 1)) / 4)