A Puzzle no Grandmaster solved until Tal solved it
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And, if I remember correctly, he solved it without sight of the board!
think so
Yeah, I read he "saw" the solution while having a walk - impressive chess imagination!
This is however not so rare, I find the solutions of some puzzle in the same way - after some break and without the board or diagram. They are hovewer much simpler than this one 
Sometimes in OTB tournaments I find interesting ideas while having a short rest while my opponent is thinking on his move. I think I just need a "fresh sight" on the position which I get when analysing just in my memory, without looking at the board/screen/diagram
Why promote the pawns to knights and what kind of puzzle was it....???
Woah, nice one!
The underpromotions were forced to prevent checkmate threats.
right...
no wonder why Tal solved it first
The bishop goes zooming everywhere
This is definitely the coolest puzzle I've seen.
If Nf7, Be8
It's complicated but it is cool 
wow..
I wonder if Deep Blue took a walk would it have figured it out?
4...Nf7 is a blunder according to engines.4...Kg4 will prolong the game but white is still winning. Great puzzle and Great Tal!
Stunned!! That is the single most amazing puzzle I've ever seen!
RogerOT wrote:
If you put the puzzle into Houdini, it won't find the solution.
I am not stunned to find that out.