People claim presenting the "best puzzle of all time" all the time here but if any puzzle deserves that title, it is this one. Before the idea was accomplished, most problemists believed it was impossible and that includes me. Magnificent!
Best Chess Puzzle of All Time
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I agree, it's such a gem and no description of this puzzle is too exaggerated.
The Babson Task is my favorite chess puzzle of all time. It's white to move and mate in 4.
I made a video that explains the puzzle and discusses the fascinating history of the problem. I thought some people here might enjoy it!
(If you haven’t heard of the Babson task, you’re really missing out)