Event: Belper Club Championship

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Opponent	Rating	Result
Luke S Alldread	1849	0 - 1
Alan F Downham	1850	1 - 0(def)
Martin Cobham	1742

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1449 = (1849 + 400 * (0 - 1)) / 1)