Event: Open

Opponent Rating Result
Robert Mitchell 1805 1 - 0
Shabir Okhai 2271 1 - 0
Jack Pilley 2061 0 - 1
Graham J Sharpe 2013 ½ - ½
Martin P Burrows 2159 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2222 = (10309 + 400 * (3 - 1)) / 5)

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