Event: Winter Rapid

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Opponent Rating Result
John Staniforth 1740 0 - 1
David Gaskell 1154 1 - 0
Peter Turner 1333 1 - 0
Stephen Gaskell 1826 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1513 = (6053 + 400 * (2 - 2)) / 4)

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