Event: Croydon Shield

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Opponent	Rating	Result
John E Duggan	2167	½ - ½
Martin G Smith	1967	0 - 1
Mark P Smith	2033	0 - 1

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

1789 = (6167 + 400 * (0 - 2)) / 3)