B1b2rk1/p3pp1p/6p1/q1Pp4/3b1B2/2n4P/P2Q1PP1/2R1K2R b K - 0 17
Stockfish rates this position as -2.94, so Black is clearly winning. Or is it so clear? After 1... Bxf2+ 2. Qxf2 Ne4+ 3. Bd2 Nxf2 4. Bxa5 Nxh1 5. Bxd5, White obtains the Bishop pair in an open position and a passed pawn. This is not the winning move. (Actually, there are two: The alternative is 1... Qxc5.)
However, I cannot fathom how Black is better. Sure, material is even in terms of points, the White LSB is locked in and eventually Ba6 will be played, but when is eventually and how?