Event: WMA Spring League Division 2

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Opponent	Rating	Result
Nathanael Kasafir	70	½ - ½
John Mildenhall	70	0 - 1
George Mitchell	70	1 - 0
Louis (Sandy) Stritton	0	0 - 1
John Foxall	0	½ - ½
Margarita Sanchez	70	1 - 0
Nathanael Kasafir	70	0 - 1
John Mildenhall	70	0 - 1
George Mitchell	70	1 - 0
Louis (Sandy) Stritton	0	0 - 1
John Foxall	0	0 - 1
Margarita Sanchez	70	1 - 0

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

-20 = (560 + 400 * (4 - 6)) / 12)