Ч83
(CAM) ЧЁРТ НОГУ (ГОЛОВУ) СЛОМИТ (в чём, где)
collVP subj.these forms onlyfixed WO some matter is so convoluted, intricate, or confused that it is impossible to understand, make sense of, or clarify it: сам чёрт ногу сломит (в Х-е) - it (Х) could trip up the devil himself
the devil himself would be stumped (at a loss)
s.o. would have the devilfc own time with X (trying to make sense of X).