The 4-1-2n-1-2 narrow diamond is not countered by a 4-5-1 V formation. The narrow diamond easily stifles any attack from the flanks with its DL/DR & the St with 2 DCs, & the Mids with 2MCs. Then it overpowers the middle with 2 STs, an AMC and an attacking DMC. Counter attack tactics work really well in this situation against a 4-5-1 V.