Event: Belper Club Championship

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Opponent	Rating	Result
Ian R Morrell	0	1 - 0
John Potter	0	0 - 1
Keith Walsh	0	0 - 1
Edward Brown	0	1 - 0
Lee Garratt	0	1 - 0
Roger Moors	0	1 - 0

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

133 = (0 + 400 * (4 - 2)) / 6)