Event: Doncaster League

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Opponent Rating Result
Farrell P Clifford 1720 0 - 1
Farrell P Clifford 1705 0 - 1
Martin S Simmonds 1753 0 - 1
Martin Presley 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1095 = (5178 + 400 * (1 - 3)) / 4)

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