FIDE Master (2007); International Master (2009); Grandmaster (2011).
In 2008, he won the IM Tespo Engineering tournament with 9/11, won the category 3 IMA Jihlavanka Cup Olomouc and came second on tiebreak in the Czech Trebova RC Sport Open. In 2009, he won the Jesenik FIDE Open in Jesenik, the Czech Republic Junior Championship, and came =4th in the European Youth Championship U18 in Italy. In 2010, he came =1st in the 18th Donau Open in Austria, won the 20th Gor Opawa Jubilee Cup with 8/9, the Brno Open with 7.5/9, and the 19th Donau Open in Austria with 6/7. In Feb 2011, he scored 6/9 in the 16th International Lienz Open. He scored 5.5/8 in the Czech championship in May 2011, coming second, and earning his final GM norm for his efforts.* In August he placed =3rd in the 2011 Richard Reti Memorial held in Tirnavia, Slovakia. Come March 2012, and Krejci came =1st in the Czech championship U20 and U18 held in Kouty nad Desnou. In team competition, Krejci held his own during the 2011-2012 season, apart from a slightly meager stint in the Bundesliga. After the Bundesliga, he went on to win the Gabcikovo Open in June with 7.5/9 and to come second with 8/9 behind Vladimir P Malaniuk (8.5/9) in the NIKI Open Nachod 2012. In August 2012, he came =1st (2nd on tiebreak) at the Olomouc Chess Summer 2012 - A1.
* http://www.chessblog.com/2011/05/wi... and http://reports.chessdom.com/news-20...
Note: there are two other Jan Krejcis from the Czech Republic.
Wikipedia article: Jan Krejčí (chess player)