Event: Division 1

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Opponent Rating Result
Janis Petersons 1865 ½ - ½
Mark D Brougham 1913 1 - 0
Richard R Welford 1967 0 - 1
Adrian O Pickersgill 1932 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1919 = (7677 + 400 * (1 - 1)) / 4)

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