Event: Division 1 - Open

Opponent Rating Result
David J Archer 1997 0 - 1
Mark V Abbott 1897 1 - 0
David J Archer 1997 0 - 1
Joshua P Blackmore 1835 0 - 1
Charles V Howard 1877 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1761 = (9603 + 400 * (1 - 3)) / 5)

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