600 modern chess puzzles

Martyn Kravtsiv is an experienced grandmaster from Lviv, Ukraine. His tournament results include tied first places at Cappelle in 2012 and the 2015 Ukrainian Championship, as well as being blitz champion of the 2008 World Mind Sports Games (at age 17). He represented his country at the 2017 World Team Championship and was a coach for the team that won silver medals at the 2016 Olympiad.