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Herman Grooten is an International Master, a renowned trainer and the author of several highly acclaimed books about chess training and chess strategy. In the 129th instalment of his ChessBase show "Understanding before Moving", Herman continues his series "Chess history in a nutshell" and talks about tactics and the attacking and defending skills of Wilhelm Steinitz, the first official World Champion. | Photo: Pascal Simon

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.

Tim Krabbé's book "Schaakkuriosa" showed a study by the Bulgarian chess composer I. Ionchev, flawed but nevertheless interesting. Yours truly tried to follow in his footsteps. Nadareishvili explored the same concept, and it might be unfair to associate the name with Ionchev as he was neither the first, the last, nor the most important one to show it - only the most famous. | Photo: Pixabay

They're the stuff of generations of nightmares—come with us on a blood-soaked journey through cinema's most scary serial killer movies.

Here they are--the 100 scariest, strangest and most disturbing horror movies ever made. Watch them if you dare.