Hi, this strategy is a real suicidal one:
a "legal" defensive line must have at least 3 among dc and dl/dr ( so, 3 dc , dl-dc-dr , dl-dc-dc, dc-dc-dr).
in this case your opponent is resigned to loose,no chance for him,finally.
Anyway, to perfectly counter him, I should use a 4-5-1 v style ( as vs narrow diamond)