Event: Belper Club Championship

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Opponent	Rating	Result
Edward Brown	1482	1 - 0
Norman W Parkin	1486	1 - 0
John M Potter	2145	0 - 1

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

1838 = (5113 + 400 * (2 - 1)) / 3)