The following tactics problem is problem #97369 from ChessTempo. It is a position from a game between Yuri Yakovich and Pavel Kotsur. It's black's move.
The idea of the tactics problem is to find black's best move from the shown position.
But my question is slightly different: If both players play perfectly from the position shown in the diagram, can black force a win, or can white force a draw?
[FEN "6k1/5p2/1Pp3pb/2q4p/1rNpPP2/3Q2PP/8/5RK1 b - - 0 1"]
I tried using a couple of chess engines to analyze the position. The lines they suggested gave black a positive score, but didn't seem to give a forced win.
So what do you think: is it a theoretical win for black or can white escape with a draw?