Yes a difficult one.  Can I post it here?

The last puzzle is a silly one.

You want something difficult?

Solve this:

Add 10 black knights and all necessary white pieces to create a legal position in which white to move either stalemates or loses.  (Yes, it can be done!)

Do you even call the 4th one a puzzle !!!..thats insane...rest were cool.

Your idea is good but possible number of moves reaches 4... Promotin to N, only takes maximum of 3 moves.

ok, going to give it another shot. This is a puzzle by Richard Reti, I took from a book. I still don't get it. Is the puzzle correct or does it have faulty moves by black?

White to move and draw.

The presented soljution was wrong specifically 3 Ke5.  Black should win here with 3...h2!, 4 c7 (4 Kd6 h1=Q, 5 c7 Kb7, 6 Kd7 Qh7+!) 5 Kb7, 5 Kd6 h1=Q, 6Kd7 Qh7+ 

The winning moveshould be 3 Ke7!

This I call a real chess puzzle. I am refering specially to the first one.

The first one is brilliant. 

But 1...g5 doesn't explain it all. It can be either g6-g5 or g7-g5. 

This number one puzzle must be the real puzzle of all times.