The paper proves h_nc(4,0;4,0)=26 using SAT/ASP solvers and linear subreduction, showing that 26 bicolored points in general position always include an empty monochromatic quadrilateral.
Brass,Empty monochromatic fourgons in two-colored point sets, Geombinatorics, 14(2) (2004), 5–7
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Combinatorial Geometry of Erd\H{o}s--Szekeres Type Problems: SAT/ASP Modeling and Linear Subreduction
The paper proves h_nc(4,0;4,0)=26 using SAT/ASP solvers and linear subreduction, showing that 26 bicolored points in general position always include an empty monochromatic quadrilateral.