Event: MID County / Lewis Cup

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Opponent	Rating	Result
Robert Jacobs	172	0 - 1
Robert G Thompson	146	½ - ½
Russell R Goodfellow	159	1 - 0
Andrew C Waters	158	0 - 1
James M Wheeler	159	0 - 1
Chris Marshall	151	½ - ½
Ian J Clark	134	1 - 0

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

97 = (1079 + 400 * (2 - 3)) / 7)