Event: Beverley Club Championship

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Opponent	Rating	Result
Alec Grice	138	1 - 0
Graham Lee	117	½ - ½
Edward S Oxley	142	½ - ½
Derek A Sheppard	135

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

266 = (397 + 400 * (1 - 0)) / 3)