Event: A&B Division

Opponent Rating Result
Gary Leighton 1517 1 - 0
Andrew M Smith 1929 ½ - ½
Sahil Farooq 1676 1 - 0
Peter Harker 1703 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1906 = (6825 + 400 * (2 - 0)) / 4)

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