Both coaches already understand the strengths of each team and they already know who is the main key to the game of Barcelona and Real Madrid because of the evaluation that the coach often watches when the game is over so he records all the weaknesses of the player and creates a good strategy to penetrate enemy defense, If the match ends in a draw then it will be a shame for these two teams. So at least one of them gets the win.
I think Real Madrid will continue to perform as usual and there will be no special strategy from Carlo Ancelotti, because indeed their coach on this one is not much and has never issued a surprising strategy. But of course there are special instructions for guarding some players who are dangerous for Real Madrid. Likewise with Barcelona, Xavi also must have anticipated several players who were dangerous to their defense. But Real Madrid have the advantage because on the pitch their attack creators have a lot of experience. Toni Kroos in the Champions League match he was very visionary when he passed the ball to Rudiger which led to a goal.
Ancelotti is more experienced than Xavi. I think Ancelotti will make some changes to his match strategy against Barcelona. Because we don't see a better performance from Benzema. If Benzema is able to play well against Barcelona, Real Madrid have a chance to win. Moreover, Barcelona's defense is weak, Ancelotti has to make good use of this opportunity. But Barcelona's defense is very strong. So in this match Madrid will probably keep their defense tight and then manage their attack.