Event: Internal Rapidplay January

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Opponent Rating Result
William Rowett 909 0 - 1
Geoff Mann 1409 0 - 1
Bhima Patil 1320 1 - 0
George Butterworth 922 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1140 = (4560 + 400 * (2 - 2)) / 4)

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