Event: Doncaster League

Opponent Rating Result
Alexandru Zimleanschi 136 ½ - ½
Ismet Berisha 143 ½ - ½
Peter Catt 141 1 - 0
Farrell P Clifford 123 ½ - ½
Tony Pogson 159 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

220 = (702 + 400 * (1 - 0)) / 5)

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