The following position has only eight pieces on the board with Black to move, but it is very tricky. I started trials with my modest means (Houdini 6.02) and White won 3/3 times, but after very complicated lines. I went deep in one case at d= 31/126. Is the ending really won for White?
[FEN "1r6/8/1P1Q2k1/K2P4/N7/3q4/8/8 b - - 0 0"]