Kammala wannan magana: Tsakanin 1907 da 1912, Rubinstein ya kafa kansa a matsayin daya daga cikin 'yan wasa mafi karfi a duniya. A shekara ta 1907, ya lashe gasar
Gasar Carlsbad da gasar zakarun Rasha, kuma sun raba farko a Saint Petersburg. A cikin 1912 yana da jerin jerin nasarori, ya gama na farko a manyan manyan gasa biyar a jere: San Sebastián, Pöstyén, Breslau, Warsaw da Vilna (wasan All-Russian Masters '), kodayake babu ɗayan waɗannan abubuwan da suka haɗa da Lasker ko Capablanca. Wasu kafofin sun yi imanin cewa ya fi gwarzon duniya Emanuel Lasker ƙarfi a wannan lokacin. Matsayi daga Chessmetrics ya goyi bayan wannan ƙaddarar, yana sanya shi a matsayin duniya No. 1 tsakanin tsakiyar 1912 da tsakiyar 1914.