Krzysztof Jakubowski is a multiple medalist of the Polish Junior Chess Championship: silver in 1993 (U10), 2002 (U20), bronze in 1995 (U12), 2000 (U18), 2001 (U18). Several times participated in the Polish Chess Championship finals. In 2014 shared 2nd place (with Andrey Vovk, behind Aleksander Miśta) in Banca Feroviara Open in Arad.
He also won medals in the Polish Junior Team Chess Championship and Polish Junior Rapid Chess Championship. In 1999 Krzysztof Jakubowski won silver medal in European Youth Chess Championship (U16) in Greece. Krzysztof Jakubowski has also competed successfully in several Polish Team Chess Championships (individual gold in 2008, and team silver in 2000, 2001).In 2001 won Swiss-system tournament in Aviléson In 2005 won B tournament in Gausdal. In 2006 won tournament in Brno.
