Event: Whittlesford (Open)

Opponent Rating Result
Ritwik C Chauhan 1780 1 - 0
Jaden Jermy 2058 ½ - ½
Peter A Gemmell 2035 1 - 0
Phil Hopkins 2035 ½ - ½
David L Haydon 2403 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2222 = (10311 + 400 * (2 - 0)) / 5)

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