Kovachev has been playing professional bridge since 2003. Kovachev has won all the major Bulgarian bridge championships. Additionally, he has won the Schapiro Cup in England, and placed 2nd on 2 other occasions. Valentin Kovachev has 3 top 3 finishes in the NEC Cup in 2010, 2011, and 2012.
- "Wernher Open Pairs Winners" (PDF). American Contract Bridge League. 2014-07-22. p. 4. Retrieved 2014-10-17.