Event: Division 1

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Opponent Rating Result
Michael J Ashworth 2105 0 - 1
A Clive Walley 1916 ½ - ½
Thomas Ash 1736 1 - 0
Hayden Griffiths 1750 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1977 = (7507 + 400 * (2 - 1)) / 4)

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