Russian chess champion Yuri Yeliseyev, 20, has died after falling from the balcony of a Moscow apartment block when his parkour practice went wrong.
The chess grandmaster fell from the 12th floor of the apartment on Saturday and died before an ambulance arrived.
A fan of parkour, a sport involving climbing up and leaping from walls, buildings and roofs, Yeliseyev was seen performing stunts over the summer by a neighbour, the Life channel reported.
Fellow grandmaster Daniil Dubov said on social media that Yeliseyev had been trying to climb from a window to a nearby balcony when he slipped.
His flatmate, Shamil Arslanov told Ren TV that "Yuri loved extreme things" and had climbed between the window and the balcony in the past.
Yeliseyev became a grandmaster in 2013 and clinched this year's Moscow Open. He is ranked 212th by the World Chess Federation.