  We consider the analogue of Kutasov-Schwimmer-Seiberg duality for
two-dimensional $\mathcal{N}=(2,2)$ $U(k)$ gauge theory with one adjoint $X$
with the superpotential $\Tr X^{l+1}$ and with fundamental and anti-fundamantal
chiral multiplets. We give the evidences for the proposed dualities by
analytically proving that the elliptic genus of dual pair coincides with each
other. For some of the dual pairs flowing to the superconformal field theory,
we show the nonperturbative truncation of the chiral ring. For the theory with
one adjoint and $N_f >k$ fundamentals, we argue the theory exhibits mass gap.
