Event: Hammersmith Rockhammer Cup

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Opponent Rating Result
Charles Rigby 1531 0 - 1
Peter Rose 1176 1 - 0
Andrew Macleod 1781 0 - 1
Charles Carr-Jones 1183 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1218 = (5671 + 400 * (1 - 3)) / 4)

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