Between 1907 and 1912, Rubinstein established himself as one of the strongest players in the world. In 1907, he won the Carlsbad tournament and the All-Russian Masters' tournament, and shared first at Saint Petersburg. In 1912 he had a record string of wins, finishing first in five consecutive major tournaments: San Sebastián, Pöstyén, Breslau, Warsaw and Vilna (All-Russian Masters' tournament), although none of these events included Lasker or Capablanca.. Some sources believe that he was stronger than World Champion Emanuel Lasker at this time. Ratings from Chessmetrics support this conclusion, placing him as world No. 1 between mid-1912 and mid-1914.