Event: WMA Spring League Division 2

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Opponent	Rating	Result
AD (Tony) Williams	0	0 - 1
Mike J Johnson	70	½ - ½
Nicholas Fallowfield	70	0 - 1
Nigel Byrne	70	1 - 0
Jaspar Goodall	0	0 - 1
Christopher J Evans	0	0 - 1
AD (Tony) Williams	0	0 - 1
Mike J Johnson	70	0 - 1
Nicholas Fallowfield	70	0 - 1
Nigel Byrne	70	½ - ½
Jaspar Goodall	0	½ - ½
Christopher J Evans	0	½ - ½

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

-165 = (420 + 400 * (1 - 7)) / 12)