Black to move

Rb1 because it's direct and uncomplicated so let's have a fight.

Ne4 -> Queen moves -> e5 to set up bishop to take knight and for knight to ultimately take f2

a4, keep pressuring the king's defenders

f6; I recently had a sort of similar position (in terms of my structure and white's piece placement) and got butchered by tactics on the long diagonal. Whatever other advantages black may have, if you cannot move the bishop, you cannot finish development, cannot remove the king from the center, and cannot proceed with your dastardly plans.

In this position, f6 not only shuts the long diagonal, it also keeps white's stupid knight as stupid as ever on h3. Once our own position is secure, we can play (in some order) Bd6, O-O, Bd7-a4, a5-a4, Rhc8, and/or whatever other fun things we want to do.

I'll throw in another choice. I think ...f6 is too passive, and ...Rb8 is too slow. White's K is in an uncomfortable position, so Black needs to be active before White can develop his K side and rush to the defense. Both ...Ne4 and ...a4 are tempting, but I think premature.

My move is ...Bd7. Now I have 5 pieces aimed at the K position, and he has only three defenders (if you count the Rd1). My next move will be ...a4, after which the B is in position to join in the attack.

Looking at the position I'd say to keep king in centre for now, develop Bd7 and maybe play for Rc8. Ne4 is possible but doesn't look right before Bd7.  Black needs more pieces before going in for the kill. White's king safety looks abysmal. 

mmmmmm....

a4 duh

I don't know would be one accurate answer.

I would be tempted to play ...e5 in order to protect my g pawn and to vacate e6 too intending to capture on b3.

If we're trying weird attacking moves, why not Na4

My thought is 1.Na4 Qe5 2.Ba3 Qxg7 3.Bb2 (protecting the rook, seizing the diagonal, hitting the queen) ...Qg5 4.Be5 Now we control the g7 square, so we can use it to transfer the knight, play a4, and white has all of our pieces living in his shed (paying no rent)

Interesting thought, but after 1...Na4, White has 2. Qd4.

I'd be tempted to start with ...Ne4, just asking the question to the queen and the f2 pawn, Qd4 in response isn't working - there might also be some ideas of playing ...Be7 without needing ...f6 (due to Qxg7 Bf6 ideas), or just continuing with ...a4. However there are a whole bunch of moves that look nice 1...f6, 1...Rb8 as well as others.

a4. white pieces are awkward. Black has bishop pair. open it up and go all out attack.

I analyzed the position, and it says f6 is best. 

Just sayin’ 

so what was the move, and why?

What is the move and why? I'm really interested to know the answer. There are a ton of cool candidate moves (my beloved Na4 seems refuted....sad news for a good looking move!), and - if I did come up with the computer move by playing in my usual tactical-but-cowardly fashion, I want to give myself a pat on the shoulder. 

And if you CAN play a4, I want the line because I looked and looked, and it always looked bad to me!