プロの将棋の棋士になるにはライセンスがいる？
Players who successfully move up the ranks to 3-dan participate in the 3-dan League (三段リーグ "san-dan riigu"). This league is held twice yearly and the two top finishers of each league are promoted to 4-dan, thus gaining professional status. 
The 3-dan League was established in 1987 with an initial limit of four players qualifying for 4-dan promotion in response to a concern that the average of five to six new professionals every year was diluting the professional pool.
no