It's unique to see that Real Madrid's chances are only 31% to win, because they are the defending champions, and their chances should be greater even play away at the Emirates.
I am sure Ancelotti knows what he was doing. It's not the first time Real Madrid met Arsenal; they even met on the ICC (2019), the Emirates Cup (2008), and the UCL (2006), but Real Madrid did not win it all! Guy, in the last 4 matches, Arsenal won 2 matches, and the rest were a tie. This could be homework that should be fixed immediately because in La Liga, Real Madrid also has a problem with the squad; they lost when met Valencia, and it seems their focus was split between the Copa del Rey final, which drained their energy.
That odd that was given to Real Madrid vs. Arsenal even at the Emirates is very attractive. I would rather risk it for A Real Madrid win in the champion's league rather than give it to Arsenal. The are most likely to get shocked again tomorrow.