Event: Norfolk County Chess Championships

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Opponent Rating Result
Dan Joal Allwin Christopher 1759 1 - 0
Stephen LA Orton 2116 0 - 1
Jim McAvoy 1763 ½ - ½
Samuel Gaffney 1827 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1866 = (7465 + 400 * (1 - 1)) / 4)

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