Event: Hillingdon Div 1

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Opponent Rating Result
Nigel Colter 1692 ½ - ½
Eugene Gregorio 1730 0 - 1
Ian K Cross 1691 ½ - ½
Andrew Hayler 1927 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1660 = (7040 + 400 * (0 - 1)) / 4)

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