He played in the 2006 PDC World Darts Championship, whitewashing Lionel Sams in the first round without dropping a single leg. He then went on to beat Dutchman Jan van der Rassel in the second round before losing to Gary Welding in the last 16. Kuczynski had won the first set and could have taken the second before Welding leveled. The American went back in front to lead 2–1, but Welding fought back to take the next three sets and a quarter final place to end Kuczynski's run.