: Black voluntarily accepts doubled f-pawns after 10. Bxf6 gxf6 . While this looks like a structural weakness, it provides Black with the semi-open g-file for counter-attacks and the pair of bishops.
: Despite the pawn structure, the exchange of queens often favors Black due to the long-term power of the bishop pair in simplified positions. Modern Relevance The Richter Rauzer Reborn, The Kozul Variation ...
: The primary source for this variation, containing deep analysis and theoretical updates as of late 2019. : Black voluntarily accepts doubled f-pawns after 10