Education
He graduated in Philosophy and Evangelical theology in Prague.
He graduated in Philosophy and Evangelical theology in Prague.
He was trained by Štefan Blaho, Róbert Tibenský and Ľubomír Ftáčnik. He is a regular contributor to the Moderný šach magazine, as well as the Novoborský šachový server and the ChessFriends.com News section. Markoš was awarded the title of International Master in 2001.
He finished second in the national championships of 2006, behind Tomáš Petrík, and 2007, behind Sergei Movsesian.
In 2007, Markoš gained the Grandmaster title. He played for the Slovak national team at the Chess Olympiads of 2000, 2002, 2006, 2008, 2010 and 2014, at the European Team Chess Championship of 2001 in León, Spain, at the European Under-18 Team Chess Championship in 2000 and 2001, and at the Mitropa Cups of 2002, 2008 and 2014.
He also plays in the Slovak Extraleague for "Slovan Bratislava", in the Czechoslovakian Extraliga for "Novoborský ŠK" (formerly for "Zlín"), in the German Bundesliga for "San Francisco Berlin" (formerly "Bindbach"), in the Austrian Bundensliga for "Lackenbach" (formerly "Pamhagen").
In 1997, Markoš became Slovak Under-12 champion and subsequently U14 and U16. In 2000, he became the European Under-16 Champion and won for the first time the Slovak Chess Championship in Zvolen. He won the Slovak championship in 2011 and 2012. In 2012 Markoš won the 2nd Riga Technical University Open.