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)