. . "Chess Openings." . . . . . . . . . . "Modern chess opening theory" . "Modern chess opening theory"@en . . . "Modern Chess Opening Theory"@en . . . . . "Modern Chess Opening Theory ... Translated [from the 1958 edition] by Dr. D.J. Richards. English translation edited by P.H. Clarke"@en . . . . . . . . . "šah." . .