Event: Hillingdon Div 2

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Opponent Rating Result
Gabriele Martellotta 1427 ½ - ½
Ian K Cross 1703 0 - 1
James Lyons 1620 1 - 0
Gabriele Martellotta 1427 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1644 = (6177 + 400 * (2 - 1)) / 4)

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