Will Bosi has made a flash ascent of Jana Švecová's Dune, 8B+, at Stařechovícký Lom, Czech Republic.

The flash is his second at 8B+, after having flashed Martin Stráník's Charizard in April 2021.

In February 2023, Will also made a flash ascent of Graceland, 8B+ - in what was his first pull on to rock on a trip to Germany - but felt that the boulder was more of a hard 8B, a grade that he has flashed a further seven times.

Dune was first climbed in December of last year, and follows a series of tiny crimps through a thirty degree overhang. Starting from sitting, it adds five moves to Švecová's 7C+ FA Crimp Busters.

Švecová said that the boulder had three crux moves, the third (a deep lock off on a small crimp to allow the left hand to move into a high sidepull), the fourth (keeping core tension whilst pulling hard on the sidepull to allow the right hand to slowly reach a terrible crimp), and the seventh (the crux move of Crimp Busters, a relatively simple move to yet another poor crimp, leaving the climber at full stretch).

Upon making the first ascent, Švecová gave the boulder a grade of 8B. However, two holds on the climb have since broken, and Will has proposed a post-break grade of 8B+.

Speaking on social media, Will said that he 'managed to just pull it out the bag and get the flash', and that the boulder 'definitely felt harder than 8B' but that it was 'hard to grade on flash tries', so it would take more ascents before a consensus could be reached. 

Check out the video below for footage of the full ascent, as well as Will's even more impressive downclimb of a tree.