Event: Preston Club Championship

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Opponent	Rating	Result
Conor Reaney	167	0 - 1
Gordon L Glover	120	½ - ½
Josh Mchaffie	100	1 - 0
Alan Pidcock	136	0 - 1

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

31 = (523 + 400 * (1 - 2)) / 4)