Born in Warsaw, he was Polish Under-18 champion in 1994, and National champion of Poland in 2004 and 2009. He was awarded the International Master title in 1996, and the Grandmaster title in 1999.
In 1995, he won in Zlín and in 1996, finished first in Budapest. He tied for 1st-4th places with Liviu-Dieter Nisipeanu, Vlastimil Babula and Zoltán Almási at the Krynica 1998 (zonal tournament). A four times qualifier for the FIDE World Championship finals (Las Vegas 1999, New Delhi 2000, Moscow 2001 and Tripoli 2004), at Delhi he beat Jonathan Speelman, Michal Krasenkow, and Alexander Beliavsky but lost in 4th round to Viswanathan Anand.
Macieja won the European Championship at Batumi 2002 and tied for 2nd-3rd with Viktor Korchnoi, behind Alexei Shirov, at Reykjavík 2003. He was 5-times European Team Vice-Champion (1997, 1999, 2001, 2003, 2005).
He played for Poland in five Chess Olympiads. In 1998, at third board in 33rd Chess Olympiad in Elista (+3 –1 =6); In 2000, at third board in 34th Chess Olympiad in Istanbul (+3 –1 =6); In 2002, at second board in 35th Chess Olympiad in Bled (+1 –0 =10); In 2004, at first board in 36th Chess Olympiad in Calvià (+4 –3 =5); In 2006, at second board in 37th Chess Olympiad in Turin (+1 –2 =5).
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