Here is a fun puzzle I found some time ago. It was created by Karl Fabel in 1952 and published in Rätselstunde.
[title "White to move and NOT checkmate in one!"]
[fen "B5KR/1r5B/6R1/2b1p1p1/2P1k1P1/1p2P2p/1P2P2P/3N1N2 w - - 0 1"]
This is honestly one of the most unique puzzles I ever saw.
It will take some time to find the solution but it is very satisfying once you do.
Hopefully there is a way to post a comment with your guesses without spoiling the fun for others. Please use
>!to hide your post and prevent spoilers.