Efim Bogoljubov

Efim Dmitrievich Bogolyubov (uk:Боголюбов Юхим Дмитрович) (April 14 [26], 1889, Stanislavchik, Kiev province - June 18, 1952, Triberg) - Russian and German chess player. Two-time champion of the USSR (1924, 1925), contender for the title of world chess champion. At the competitions he represented the Russian Empire, USSR, Germany