Event: WMA Spring League Division 2

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Opponent	Rating	Result
Jeremy Humphries	0	½ - ½
Seth Clark	0	1 - 0
Ed H Goodwin	70	0 - 1
Julie C Wilson	1814	0 - 1
Tim A Lane	70	0 - 1
Peter J R Oliver	70	1 - 0
Jeremy Humphries	0	½ - ½
Seth Clark	0	1 - 0
Ed H Goodwin	70	1 - 0
Julie C Wilson	1814	0 - 1
Tim A Lane	70	0 - 1
Peter J R Oliver	70	0 - 1

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

271 = (4048 + 400 * (4 - 6)) / 12)