Event: Derbyshire Individual

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Opponent	Rating	Result
David Hatton	0	0 - 1
Michael D Boreham	0	½ - ½
Kevin J Gallagher	0	1 - 0
Stuart Marshall	0	1 - 0
Edward T Bromilow	0	½ - ½
Kevin J Dalley	0	1 - 0
Martin Pettinger	0	0 - 1

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

57 = (0 + 400 * (3 - 2)) / 7)