Event: Croydon Shield

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Opponent	Rating	Result
Anthony P Cullen	2000	1 - 0
Mehmet Ali	1979	½ - ½
John H Lewin	1859	½ - ½

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

2079 = (5838 + 400 * (1 - 0)) / 3)