Puzzles : Difficulty level = high

Here are 3 positions to solve.

Difficulty level : High ! The variations are not necessarily long but the winning move(s) can be difficult to spot. Any engine would give the solution right away, but for the human brain it takes more effort. I would suggest 5 minutes for each position.

The positions are increasing in difficulty somehow.

1 White to finish off the game.

2 Black to play. We sense that there is something in the position, but can you find a path to the win ? there are several variations to consider, for White and for Black. 

3. Black to play. This is extracted from a blitz game I played recently. after reviewing the game, the stockfish engine pointed out a spectacular idea here for Black, much stronger than what I played.

In the diagram below, my opponent (~2300 rating) saw my threat Rh1# and just played g3-g4 to avoid checkmate making black's life harder

This is to show that getting stronger in tactics can help make the difference in your games.