Event: Hillingdon Div 2

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Opponent Rating Result
Alastair G Johnstone 1580 0 - 1
John Sears 0 ½ - ½
Abu Hasan 1377 1 - 0
Gabriele Martellotta 1427 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

996 = (4384 + 400 * (1 - 2)) / 4)

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