Russian born German Efim Bogolyubov was born on 14 April 1889 in Kiev. World Ranking: 1st (in 2 different months between January 1927 and February 1927). He was considered to be one of the best 10 chess players between 1919 and 1936. According to Chessmetrics his highest rating is 2768.

He participated in one Chess Olympiad in 1931 playing for Germany. He won individual silver medal and placed 5th with the team. He played against Alekhine for the world champion title twice. In 1929 he lost to 15.5-9.5 and in 1934 to 15.5-10.5.

Interesting facts: 

The Bogo-Indian chess opening was named after Bogolyubov (1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+).

He died at the age of 63 on 18 June 1952 in Triberg in Schwarzwald.