#bestmove

This puzzle came up during a training session on lichess, I really liked it so I post it here. Black to move, white has just put his knight on d2, so what is blacks best continuation, you should more than

Black has just played Rd8. Here white has a strong move, it might not win immediately, What is this move ?

White to move, find the crushing move. In this position I found a real crushing move, can you also find it ?

White has just played Qb2, What is blacks best move ? I think this one should be fairly easy.

I will be doing tactics trainer in this stream, so you can ask questions if you want, no clock running. My live stream is at DLive