Event: Division 1 - Open

Opponent Rating Result
Ian Henry 1575 ½ - ½
Chris M Collins 1931 0 - 1
Mark V Abbott 1884 ½ - ½
Phil J McConnell 1624 0 - 1
Joshua P Blackmore 1865 0 - 1
Mike Bender 1650 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1622 = (10529 + 400 * (1 - 3)) / 6)

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