Black to move is winning. The position is taken from the italian translation of the book "Chess Positions" by C.H.O'D. Alexander
Ortueta - Sanz (Madrid, 1934)
1... Rxb2 !! 2. Nxb2
(2. Rf7 Rxa2 3. Nc3 Ra3 4. Rf3 Ba5 -+)
(2.Nc3 Rc2 3. Ne4 c3 4. Kf1 Rc1+ 5. Ke2 c2 6. Kd2 Re1 -+)
2... c3 !! 3. Rxb6 c4 !! 4.Nxc4 c2 with a won position.
If you want to check all the variations, please set up the position and check it with a chess engine.