Event: Rapidplay league

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Opponent Rating Result
Antony J Waley 0 1 - 0
Brian GE Gosling 154 1 - 0
Antony J Waley 0 1 - 0
Brian GE Gosling 154 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

477 = (308 + 400 * (4 - 0)) / 4)

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