Anyone 1500+ can recognize the natural move--that's what makes it natural. Probably the easiest case of "natural move but blunder" is anything that is a top 3

Anyone 1500+ can recognize the natural move--that's what makes it natural. Probably the easiest case of "natural move but blunder" is anything that is a top 3 engine move when looking 3-5 moves deep, but losing significantly on deeper evaluation. Also, this sort of categorization is at the heart of how chess puzzle collections are automatically assembled. A good chess puzzle contains an unnatural move that wins--the exact opposite of the natural but blunder. Chess sites scan their online play databases for these all the time, and serve them up as puzzles.