Event: Division 2

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Opponent Rating Result
Mark D Brougham 1871 0 - 1
Maharnab Choudhury 1708 0 - 1
Robert McDonald 1827 1 - 0
Janis Petersons 1870 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1719 = (7276 + 400 * (1 - 2)) / 4)

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