Yes, I think it was a6 and c6, but i brute-forced it
Lrf vg vf n6 naq p6, orpnhfr gur bayl zbir oynpx pbhyq qb cerivbhfyl vf jvgu uvf xavtug, naq vg unq gb or ba bar bs gubfr gjb fdhnerf. Fb vs bhe ebbxf ner gurer, vg znxrf gur bayl cerivbhf yrtny zbirf vzcbffvoyr
(I hope my explanation is clear enough ^^")
there's only a knight and the night has to move back but the 2 rooks would prevented that and you can't move the other knight because it isn't there
