Event: Division A

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Opponent Rating Result
Tim Hilton 170 0 - 1
Jon I Lonsdale 152 ½ - ½
Peter J Mulleady 176 ½ - ½
Robert A Newton 173 0 - 1
Jon I Lonsdale 152 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

5 = (823 + 400 * (0 - 2)) / 5)

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