Event: Division 1

Opponent Rating Result
Benjamin I Nevett-Farman 1950 0 - 1
John Staniforth 1817 0 - 1
Tony Preece 1850 ½ - ½
Lukasz Marcin Walijewski 1718 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1734 = (7335 + 400 * (1 - 2)) / 4)

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