Iron bull: i want to fight you Solas. Find the cracks in your armor so to speak. Solas: that would be an interesting yet deadly encounter. For both of us. Iron Bull: (disappointment) hmm your right. Solas: Chess then? Iron Bull: let's see what you got. (Both begin playing chess like its a battlefield.
The chess match really sets the tone of spoilers ahead.... . . . . . Shows how the Qunari vs Solas's agents playsbout in Trespasser and in the overall scheme of things, great foreshadowing if it is.
I do like the touch that Solas begins playing chess with Iron Bull /ONLY/ if he chooses freedom over the Qun. That's Solas respecting Bull, and opening up a friendship.