(常德杯世界围棋名人争霸赛) Officially the China Changde Cup World Mingren Championship. This tournament between the Japanese Meijin, Chinese Mingren and Korean Myungin was held 5 times; 2010, 2011, 2012, 2015 and 2018. Called "World Mingren" in English Wikipedia.
Of the three Meijins, one player will get a bye in the first round (as determined by lots). The other two players will play each other and the winner will get into the finals. The loser will get a chance to play the player with the bye for a spot in the finals.
2010: In the first round Lee Changho beat Gu Li, reaching directly the final. Then Gu Li beat Iyama Yuta. The final title game was played between Gu Li and Lee Changho and this time Gu Li won B+1.5, winning the tournament.