Event: Hillingdon Div 3

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Opponent Rating Result
David Websdale 1418 0 - 1
David Websdale 1429 0 - 1
Raj Parmar 1434 1 - 0
Praveen Ravichandran 1673 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1289 = (5954 + 400 * (1 - 3)) / 4)

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