Event: Doncaster Bell Trophy

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Opponent Rating Result
Peter JE Ackley 191 0 - 1
Tim Prosser 144 0 - 1
Tim Prosser 144 1 - 0
Peter JE Ackley 191 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-33 = (670 + 400 * (1 - 3)) / 4)

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