K3 surfaces with 9 cusps in characteristic p

We study K3 surfaces with 9 cusps, i.e. disjoint A 2 configurations of smooth rational curves, over algebraically closed fields characteristic p ? 3 . Much like in the complex situation studied by Barth, we prove that each such surface admits a triple covering an abelian surface. Conversely, determine which order three automorphisms give rise to surfaces. also investigate how cusps hit supersingular locus.