Event: MID Stevenson Cup

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Opponent	Rating	Result
James M Wheeler	159	0 - 1
Russell R Goodfellow	159	½ - ½
Stephen Pike	134	1 - 0
David R Heath	144	0 - 1
Thomas Stevens	128	0 - 1
Constantine Tucker	117	0 - 1
Ian J Clark	134	½ - ½

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

-32 = (975 + 400 * (1 - 4)) / 7)