Tactics # 4

Hi people.

I bet you've all heard Tarrasch's famous sentence : "Nobody ever won a game by resigning"

While there is some obvious truth in that quote, Tarrasch does have a point here: sometimes we resign in drawn or even won positions. The most clear and recent example in the famous Giri-Shankland game :

Today we'll be looking at tactics that save or win apparently lost positions ;

Here is a simple example:

It's hard to imagine the look on black's face when he realised this wasn't winning.

Credit: chess.com

Anyway, less talking, more puzzles :

Puzzle 1:

Puzzle 4: 

Puzzle 5: 

Puzzle 6:

Puzzle 7:

Puzzle 8: 

Puzzle 9:

Puzzle 10:

Please write which one was the hardest in the comments. 

Have a good day people.