Event: Division 1

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Opponent Rating Result
Gary Kenworthy 2169 0 - 1
John S Walton 1810 ½ - ½
Paul Kennelly 1848 ½ - ½
Georgios Kousouris 1600 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1657 = (7427 + 400 * (0 - 2)) / 4)

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