He achieved his greatest success in 2000, taking 9th place at the European Youth Chess Championship in U16 age group in Chalkidiki.

[2] In 2002, Stanisław Zawadzki took 1st place in two international chess tournaments: in Frýdek-Místek and in Legnica (together with Andrei Maksimenko).

He also plays in foreign leagues - in Czech Republic for A64 Grygov and in Portugal for Academica Coimbra.

[3] Stanisław Zawadzki reached the highest rating in his career so far on October 1, 2008, with a score of 2447 points, he was ranked 41st among Polish chess players.

[4] Stanisław Zawadzki's sister, Jolanta, is a Woman Grandmaster (WGM) and one of the top Polish female chess players.