Event: Division 1 - Open

Opponent Rating Result
Mark Furnevall 1906 0 - 1
Joshua P Blackmore 1835 ½ - ½
Phil J McConnell 1604 0 - 1
Ben R Wilkinson 1725 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1668 = (7070 + 400 * (1 - 2)) / 4)

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