Event: SCL Div 1

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Opponent Rating Result
David Collyer 1870 1 - 0
Ian D Thompson 2147 0 - 1
Colin B Knight 1735 ½ - ½
Gareth Aneurin Jones 1883 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1809 = (7635 + 400 * (1 - 2)) / 4)

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