The Everest of chess problems
Exactly 70 years ago today, on May 29, 1953, the world's highest mountain, Everest, was climbed for the first time – a heroic feat, exuberantly celebrated by all. Today, hundreds scale the mountain each year. 40 years ago the Mount Everest of problem chess, the daunting Babson task, which for a century had seemed quite impossible to do, was mastered for the first time. Today new versions appear regularly. Here are some of the best. It's great fun checking the symmetrical underpromotions with an engine.
Source: chessbase.com