Event: Derbyshire Individual

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Opponent	Rating	Result
George Moorcroft	0	1 - 0
David Williams	0	0 - 1
Nigel D Marshall	0	1 - 0
David Hatton	0	½ - ½
Kevin J Dalley	0	½ - ½
Leslie J Fancourt	0	1 - 0
Edward T Bromilow	0	1 - 0

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

171 = (0 + 400 * (4 - 1)) / 7)