Event: Division 1

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Opponent Rating Result
Callum Welsh 1905 0 - 1
Ihor Lewyk 2043 ½ - ½
Lee Crawford 1856 0 - 1
Fazal Rabbi 1785 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1797 = (7589 + 400 * (1 - 2)) / 4)

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