https://en.chessbase.com/post/valuation-variations-on-a-famous-kubbel-study
Valuation: variations on a famous Kubbel study | ChessBase
Jun 23, 2015 - One of the greatest chess composers in history was Leonid Ivanovich Kubbel, born in 1891 in St. Petersburg, Russia. One of the greatest contempory composers is...
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