A formula for the spontaneous magnetization of the Ising model on a checkerboard lattice with crossing interactions is proposed. Our conjecture agrees with the exact low-temperature series expansion up to the 18th order.
Lin, K. Y., & Chen, T. L. (1987). Spontaneous Magnetization of Ising Model on a 4-6 Lattice. Chinese Journal of Physics, 25(1), 178-181. https://www.airitilibrary.com/Article/Detail?DocID=05779073-198703-201303260008-201303260008-178-181