Efim Bogolyubov
In 1926, he emigrated to Germany. He won, ahead of Akiba Rubinstein that year at Berlin. At Bad Kissingen 1928, he triumphed (+6 –1 =4) over a field which included Capablanca, Nimzovich and Savielly Tartakower. Bogoljubov won two matches against Max Euwe (both 5.5–4.5) in 1928 and 1928/29 in Holland. He played matches for the World Chess Championship twice against Alekhine, losing 15.5–9.5 in 1929, and 15.5–10.5 in 1934.