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Jan Markos is a Slovak chess grandmaster, coach, and author, a former European Youth Champion. His book “Under the Surface” won the ECF Book of the Year Award in 2018. His most recent chess book “The Secret Ingredient”, co-authored with GM David Navara, focuses on practical aspects of over-the-board play. For ChessBase he writes a column for the news "The winning Academy", has a magazine video column "Practical Tips for the tournament player" and now also a Fritztrainer series "Middelgame Secrets". Markos knows how to convert complex issues into rules of thumb that viewers can easily put into practice.