What is your favourite Endgame Study?

I'm talking problem chess here and not Lichess studies ;)
Mine is the following:



I can still remember the first time I saw it and how amazed I was at White's third move and the subsequent solution.
So what's your favourite Endgame Study?

my pawn endgame! lol, nvm. I get adorable some times

Pawn end game

btw, a1=queen is considered as a blunder coz, it is just mate in one!

Sorry, but nothing beats Reti's space-time paradox with diagonal king moves.

Power of the bishop pair in an endgame. Incredible stuff.

@Wittke
I remember that I have seen the puzzle at YouTube and it is really beautiful!
But my favourite is: en.wikipedia.org/wiki/Excelsior_(chess_problem)

😁😁😁😁😁😁😁

Mirror