In 2001, in the village of Załęcze Wielkie, Daniel Sadzikowski won the title of Polish Chess Championship of Preschoolers.

[3] In 2010, he shared 2nd place in the Round-robin tournament in Mariánské Lázně, shared 4th place in the open chess tournament in Varna[4] and achieved the greatest success of his career so far, winning in Porto Carras silver medal in World Youth Chess Championship in U16 age group.

[5] In 2011, he won in Iași the title of European Boys' U18 Team Chess Champion, repeating this success in 2012 in Pardubice.

[7] Daniel Sadzikowski has participated many times in the Polish Chess Championships, in which he won a silver medal in 2020.

He achieved the highest rating in his career so far on August 1, 2017, with a score of 2594 points, he was ranked 11th among Polish chess players.