After the game against Barcelona, i think we can say that Pellegrini has found his idea. Since one month and the game against Getafe at the Bernabeu, Real Madrid is practically playing the same way.
A sort of a 4-1-2-1-2. PlayersGK:
Short Free Kick: Ronaldo
Long Free Kick: Ronaldo / Xabi Alonso
Free Kick 2: Xabi Alonso
Left Corner: Xabi Alonso
Right Corner: Xabi Alonso
Penalty Taker: Ronaldo
Players To Go Up: Pepe, Raul Albiol
Seeing all this game, this is what i think Pellegrini idea is :
Pepe and Albiol are playing with some space between them. Alonso is very close to them.
Arbeloa has a defensive role. He's about blocking the side and can press with a good liberty as long as Marcelo is ready to cover it. Marcelo who is offensively taking care of the side for him.
Ramos has a balanced role. He has a good cover and can frequently take his chance to go up. The fact that Lass is taking care of the side do not make him an offensive player i think cause he do not forget to go down and replace himself.
Alonso is playing near the defence, organising and doing the first pass, he usually use his SPA but can also jump the second line of the midfield cause he obviously has a great Long Pass ability.
Defensively speaking, i think his position on the axial area put him on the good condition for doing defensive work. Not his only task but i'd say 50% of it, the other 50% being as much available as possible for organising the team (with the ball i intend)
Lass on the right has a purely defensive role. He's covering Ramos AND Alonso when this one try to intercept the ball. This kind of position force him to be patient during the game cause he can not try to steal the ball too deep and be ready to cover. But i really think that in this formation, he a 2 main task very important, cover and pressure.
Marcelo on the left side has a more balanced role. He have to participate to the offensive phase (in which case he can switch position with Kaka or Ronaldo) and block the let side, helping Arbeloa When the team do not have the ball. Also i'd say he have to press a lot and more deep that Lass.
Kaka is leading the offensive line. He is very free on the field and can choose if he's making a vertical or horizontal run. He's not playing like a classic N°10, but lead the counter attack and have to make the last pass.
Ronaldo, on the left of the attacking line, playing SS and not Winger i think.
Not because i choose it but because he simply replace Benzema (or Higuain) and have to take the same role. Going near the line for making more space and go deep in the kill zone.
Beside that, the fact that Arbeloa and Marcelo are playing on the left side make me think that Pellegrini can not ask 1 more player to play as a winger. Even if Arbeloa do not go up very much, the left side is taked care of. So i think Ronaldo will play like a SS and be more about the central area (or the right side when he switch position).
Now Higuain, playing CF i think, even he's very medium on this position. He's the more deep player on the field, and has sometimes to go on the right. He frequently go on the left doing diagonal crossing and switch with Ronaldo.
I'am not sure precisely of the positioning on the formation tools but i think this is kind of close.
Maybe the next games will help to be sure of it. But anyway, this is more actual than the formation up on the thread which we didn't see since September i think...