Solo Traveler VS Lvl 80 Unfinished Chess Game

Been trying to get this challenge done for so long now on Lvl 90. So far no luck, but I figured I may as well show my run on the lvl 80 domain. Just to maybe give some more people an idea of how it might be possible now. Best of luck to my fellow Solo Travelers. This might be the toughest solo boss in the game.