Plaskett's Puzzle, made by Gijs van Breukelen
Keep in mind the study is somewhat flawed in that Black can play 4...Kg4 instead of 4...Nf7+. It can be rectified by placing the Ng5 on e5 or h8, or even by adding a White pawn on h2. However this version is the best known.
Nice puzzle! ♥ 👍 !!
Plaskett's Puzzle, made by Gijs van Breukelen