Event: Division 1

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Opponent Rating Result
John N Harvey 1818 0 - 1
Ewan Herd 1639 0 - 1
Thomas Moran 1336 ½ - ½
Peter S Fisher 1607 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1500 = (6400 + 400 * (1 - 2)) / 4)

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