Event: Derby & District Division 3

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Opponent	Rating	Result
Philip Sheldon	1618	½ - ½
Ryan L. Smith	1868	0 - 1
Craig Fores	1407	1 - 0
Matthew Caswell	1629	0 - 1

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

1531 = (6522 + 400 * (1 - 2)) / 4)