This tactical change was brilliant to watch after the last few months,makes us solid at the back and freedom for the midfield to break away.pushing cliche/sagna right up on the wings instead of moving inside and silva/kdb allowed to come deep for the ball where they would normally be. Lots of options and different formations now. Well played Pep, Just need the players on his wave lengh to change formations when needed and not let these bus parking teams get away with mugging us off.
It worked very well, but it benefited from an element of surprise. West Ham just werent prepared for it. Everton will be and if we use it at Everton Spurs will be planning even more on how to counteract it.
The test of any formation is how well they work once opponenents suss them out. Diamonds often fail that test.
I expect we will see it now and again but not on a regular basis.