We study the asymptotics of Schur polynomials with partitions $lambda$ which are almost staircase; more precisely, partitions that differ from $((m-1)(N-1),(m-1)(N-2),ldots,(m-1),0)$ by at most one component at the beginning as $Nrightarrow infty$, for a positive integer $mge 1$ independent of $N$. By applying either determinant formulas or integral representations for Schur functions, we show that $frac{1}{N}log frac{s_{lambda}(u_1,ldots,u_k, x_{k+1},ldots,x_N)}{s_{lambda}(x_1,ldots,x_N)}$ converges to a sum of $k$ single-variable holomorphic functions, each of which depends on the variable $u_i$ for $1leq ileq k$, when there are only finitely many distinct $x_i$s and each $u_i$ is in a neighborhood of $x_i$, as $Nrightarrowinfty$. The results are related to the law of large numbers and central limit theorem for the dimer configurations on contracting square-hexagon lattices with certain boundary conditions.
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