Event: Division 1 - Open

Opponent Rating Result
Charles Doidge 1630 1 - 0
David J Archer 1956 1 - 0
David J Archer 1956 ½ - ½
Chris M Collins 1931 ½ - ½
Ian Henry 1575 ½ - ½
Piotr Ruszelak 1784 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1939 = (10832 + 400 * (2 - 0)) / 6)

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