Event: Beverley Club Championship

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Opponent	Rating	Result
Steve Tomlinson	89	1 - 0
Tim M Turner	167	½ - ½
Michael C Hackett	127	0 - 1
R Malcolm Hara	126	0 - 1

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

27 = (509 + 400 * (1 - 2)) / 4)