Event: Super League

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Opponent Rating Result
Ian A Robson 2214 0 - 1
Petru Tarabuta 2067 1 - 0
Ian A Robson 2200 0 - 1
Peter Dhonau 1988 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2017 = (8469 + 400 * (1 - 2)) / 4)

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