His question how to beat wide diamond, not narrow diamond.
===============
I suggest you to play 3-1-4-2.
----------ST------ST-----------
--------------------------------
----ML----MC-----MC----MR---- Up to your MC
--------------DMC--------------
---------DC---DC---DC---------
Order : Normal mentality, through through the middle, own half, mixed passing, normal tackling, zonal. No counter attack/no offside trap.
Or Use narrow diamond.