2011 Dan Kolov &amp; Nikola Petrov Tournament2011 Dan Kolov &amp; Nikola Petrov Tournament 2011 Dan Kolov & Nikola Petrov Tournament The 49th Dan Kolov & Nikola Petrov Tournament, was a sport wrestling event held in Sofia, Bulgaria between 25 and 27 February 2011. This international tournament includes competition in both men's and women's freestyle wrestling and men's Greco-Roman wrestling. This tournament is held in honor of Dan Kolov who was the first European freestyle wrestling champion from Bulgaria and European and World Champion Nikola Petroff. Participating nations. 291 competitors from 26 nations participated. 2011 Dan Kolov & Nikola Petrov Tournament The 49th Dan Kolov & Nikola Petrov Tournament, was a sport wrestling event