Event: Norfolk County Chess Championships

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Opponent Rating Result
Jaden Jermy 2123 0 - 1
Jim McAvoy 1763 0 - 1
Paul P Smith 2058 0 - 1
Andrew D Hartland 1821 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1641 = (7765 + 400 * (0 - 3)) / 4)

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