ok i have seen a topic about 4-5-1V and there are 3 formations to counter it :

4-3-2-1

This is 4-5-1 V-style's brother. It takes advantage of not using a DMC who won't be blocking an nonexistent AMC and vice verse. This translates into a more powerful midfield to feed passes to the forward players.

--------------ST-------------
AML-------------------AMR
------MC----MC----MC----
------------------------------
DL(UP)--DC--DC---DR(UP)

Motivated 4-5-1 flat.

While an unmotivated 4-5-1 flat would probably succumb to a 4-5-1 V-style, you can take advantage of that and make the opponent underestimate you. He'll probably realize that his flanks are under constant attack after a few goals.

----------------ST------------------
-------------------------------------
ML(UP)--MC--MC--MC--MR(UP)
-------------------------------------
DL(UP)-----DC---DC-----DR(UP)

3-2-2-2-1

While you don't need more than 1 or 2 DC's against 4-5-1 V, you don't want to use an illegal formation. The extra DC acts as a sweeper, DML/DMR block the attacks from the flanks, and AML/AMR attack the soft flanks.

----------------ST---------------
AML------------------------AMR
-----------MC-----MC-----------
DML------------------------DMR
----DC(UP)DC(DOWN)DC(UP)-

well, what is the best formation of all 3 ? i have players that can play any of this 3 formations and i'm just curious what is your experience with countering 4-5-1v, what is the best formation to counter it, orders... ? thanks a lot !