This did not happen in the game. But what would you play here as Black?

In the game Black developed his bishop on e7. But what if the bishop was played to b4 with a check and White goes c3. Black to play.

A variation from the game. How should Black continue in this position?

In the game Black had played Rad8, which is the correct move. But what if ...a5 is played. How does White win here?

Nepo's last move Bg5 has put a lot of pressure on Ding Liren. What is the only way in which Ding can save himself here. Black to play.

This is a variation in the game. How should Black continue here?

You have to be careful in this side variation. What is the only way in which Black can save himself here?

How does Black win here?