A long theoretical line, albeit an obscure one happened with Ding returning to his all-time favourite first move of the Queen Pawn. Gukesh settled into a long thought and the general consensus was Ding has put him under pressure both in the position and on the clock. But as it turned out Ding too thought for a long time once he encountered a new move and then offered a repetition of moves. And Gukesh decided to spurn the repetition even though it felt that he was worse objectively. This led to a lot of discussion of psychology and mind games and various other non-chess ideas! I get a feeling that after the loss in the third game, Ding had put a temporary break to going for unclear complications even if it seems to favour him and instead try to outplay Gukesh in simple positions.
Let us delve in to the game and see, how it turned out.