Event: B Division

Opponent Rating Result
Jon I Lonsdale 1902 ½ - ½
Andrew Lewis 1933 1 - 0
David Boulden 1679 0 - 1
Julian C Clissold 1708 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1806 = (7222 + 400 * (1 - 1)) / 4)

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