Event: D&DCL Plate QP

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Opponent	Rating	Result
Andy Greenfield	0	½ - ½
Lee Garratt	1393	0 - 1
Tony O'Donovan	1585	½ - ½
Douglas Bramley	1507	1 - 0

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

1121 = (4485 + 400 * (1 - 1)) / 4)