Event: D&DCL Plate QP

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Opponent	Rating	Result
Graham J Pace	1566	½ - ½
George Gledhill	1585	1 - 0
Jonathon Swift	1733	1 - 0
Owen Dale	1663	0 - 1

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

1737 = (6547 + 400 * (2 - 1)) / 4)