  We present a multi-spin solution to the Yang-Baxter equation. The solution
corresponds to the integrable lattice spin model of statistical mechanics with
positive Boltzmann weights and parameterized in terms of the basic
hypergeometric functions. We obtain this solution from a non-trivial basic
hypergeometric sum-integral identity which originates from the equality of
supersymmetric indices for certain three-dimensional N=2 Seiberg dual theories.
