Career
In 1979 was world student 100/200 runner up. Finishing 2nd only behind Pietro Mennea who ran the then new world record 19.72. Dunecki ran 20.26. Dunecki"s Polish national record of 20.26 was improved in 1999, by Marcin Urbas (1998 s), after 20 years.
He competed for Poland in the 1980 Summer Olympics held in Moscow, Soviet Union in the 100 where he reached the Quarter final, and the 200 metres where he reached the final and finished 6th.