Repeatedly applying the Combinatorial Nullstellensatz for Zero-sum Grids to Martin Gardner's minimum no-3-in-a-line problem

Seunghwan Oh, John R. Schmitt, Xianzhi Wang

In 1976 Martin Gardner posed the following problem: ``What is the smallest number of [queens] you can put on an [$n\times n$ chessboard] such that no [queen] can be added without…