Event: Division 1

Opponent Rating Result
Samuel Gaffney 1845 1 - 0
Panagiotis Kanellopoulos 2245 0 - 1
Peter A Gemmell 2073 0 - 1
Stephen W Ruthen 1898 ½ - ½
Panagiotis Kanellopoulos 2245 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1901 = (10306 + 400 * (1 - 3)) / 5)

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