 Complete the following phrase:  Flohrs playing ability peaked in the mid-1930s, when he became one of the worlds strongest players and a leading contender for the World Championship. He became champion of Czechoslovakia in 1933 and 1936 and played in many tournaments throughout Europe, generally finishing amongst the top three. Notable victories were at Bad Sliač in 1932, where he shared first place with Milan Vidmar; Scheveningen in 1933; Bad Liebenwerda in 1934 with 91211; Barcelona in 1935 where he tied for first with George Koltanowski; 