One of the Most Famous Chess Puzzles

That is more than a famous puzzle, it is a famous endgame position that was misanalyzed for many years because of the tricks you need to see to solve it. When I was being interviewed with 8 other people in a group for university entrance, I turned up on time to discover that the other 7 candidates had been trying to solve this puzzle for quite a while. I looked at it for a couple of minutes and gave the solution, not having seen the position before or knowing that it was famous. The interviewing professor was quite impressed.
The Saavedra position. One of my favorites. I believe it was originally published as a draw until Saavedra found the winning underpromotion.

I don't know that it's proper to call this NN vs NN though. I think it was a composed puzzle.
yeah, it was a composed puzzle.
But maybe it could've occured in a position by amateurs or something. It looks like a pretty common position to me.

yeah, it was a composed puzzle.
That's not 100 % correct. Original puzzle had reversed colors and stipulation the draw, the idea was the mentioned stalemate after queening the pawn. Later it was discovered that underpromotion wins anyway.