Event: Division 2

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Opponent Rating Result
Francis Butterworth-Parr 1623 ½ - ½
Robert P Taylor 1724 0 - 1
David Griffiths 1649 1 - 0
Pavlo Demchuk 1857 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1613 = (6853 + 400 * (1 - 2)) / 4)

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