Event: Division 1

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Opponent Rating Result
Robert T Killeen 1894 0 - 1
Andrew P Willoughby 1775 ½ - ½
Philip Staniland 1867 0 - 1
Joe Crossley 1521 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1564 = (7057 + 400 * (0 - 2)) / 4)

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