Robert Hübner is a German chess grandmaster, chess writer, and papyrologist. He was one of the world's leading players in the 1970s and early 1980s.
This text and the image thumbnail are from Wikipedia, where you can read more about the player.
You can add the player to the filter, and play puzzles based on the player's games.
A list of these puzzles is below, with the most difficult puzzles first.