Event: Derby & District Division 1

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Opponent Rating Result
Andy Townsend 1892 1 - 0
Peter Ackley 2030 0 - 1
David Hatton 1791 ½ - ½
Simon N Gilmore 2067 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1845 = (7780 + 400 * (1 - 2)) / 4)

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