The idea of the problem is to find white'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 white force a win, or can black force a draw?
[FEN "8/3Q2pk/5p1p/5P2/5K1P/p3r3/b2n2P1/8 w - - 0 1"]
I tried using a few chess engines to analyze the position, leaving them running for hours. White gets a very favorable evaluation (about +4 or +5 depending on the engine). I'd normally consider this to be enough for a certain win. But after looking at the computer's best line it seems that after initially winning some material, white's queen just goes round in circles without making any further progress while the black king sits safely behind the wall of pawns.
I guess either the position is a draw, or the computer isn't able to plan far enough ahead to find the winning line. I can't see an easy way for white to win, but I'm no expert and it's possible I've overlooked something.
So what do you think: is it a theoretical win for white or can black escape with a draw?