Event: Doncaster League

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Opponent Rating Result
John Smart 1720 1 - 0
Peter JE Ackley 2136 0 - 1
Farrell P Clifford 1716 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1991 = (5572 + 400 * (2 - 1)) / 3)

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