 Complete the following phrase:  Further controversy arose when, in 1912, Laskers terms for a proposed match with Akiba Rubinstein included a clause that, if Lasker should resign the title after a date had been set for the match, Rubinstein should become world champion. When he resumed negotiations with Capablanca after World War I, Lasker insisted on a similar clause that if Lasker should resign the title after a date had been set for the match, Capablanca should become world champion. On 27 June 1920 Lasker abdicated in favor of Capablanca because of public criticisms of the terms for the match, naming Capablanca as his successor. Some commentators questioned Laskers right to name his successor; Amos Burn raised the same objection but welcomed Laskers resignation of the title. Capablanca argued that, if the champion abdicated, the title must go to the challenger as any other arrangement would be unfair to the challenger. Lasker later agreed to play a match against Capablanca in 1921, announcing that, if he won, he would resign the title so that younger masters could compete for it. Capablanca 