[dark_horse]

This situation only comes up in B&M, limit hold'em play.

You're heads up, out of position, and leading on the flop and the turn, and are called both times. The river comes, and before you even do anything, your opponent puts his "call" out.

Is this a call? If you meant to check, is it a contract bet? If you were bluffing and saw that he was going to call, can you check, and give him the option to take his chips back and check it back?

Is it unethical to make believe you checked, his call was officially a bet, and you now have the option to check-raise?

I was in a hand when I had a medium pocket pair and raised preflop and lead all the way with one overcard, but all of a sudden I hit my set on the river. I was contemplating my best move, when all of a sudden he throws his chips out there. I said "Wait, I didn't do anything yet. But ok, I bet, you call, and I have a set" and flip my cards over. But afterwards I was thinking if it would have been unethical to say that I checked, he bet, and now I have the option to raise.