Event: Division 2

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Opponent	Rating	Result
John R McKenna	1633	1 - 0
Tom Huxtable	1756	½ - ½
Martin G Smith	1883	½ - ½

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

1891 = (5272 + 400 * (1 - 0)) / 3)