fact: Fixpoint eval_rec3 n t alpha beta b := if ieval t b is some v then v else if n is n1.+1 then process_eval_rec3 (eval_rec3 n1 (flip t)) (sflip beta) (sflip alpha) win (moves t b) else draw.
imports: HB(structures) mathcomp(all_ssreflect) mathcomp(all_algebra)