Event: Open

Opponent Rating Result
David J Farrall 1881 1 - 0
Jack Pilley 2094 ½ - ½
Alan Agnew 2140 ½ - ½
Shabir Okhai 2254 0 - 1
Roland E Graf 1848 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2123 = (10217 + 400 * (2 - 1)) / 5)

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