Keywords: Liburkin.jpg Mark Saweljewitsch Liburkin Studienkomponist Mark Savelyevich Liburkin chess study composer Kofman R M Izbranye etyudy S Kaminera i M Liburkina Fiskultura i sport Moskva 1981 ca 1929 not mentioned PD-Russia-2008 Chess players from the Soviet Union Chess composers |