He married Iweta (née Radziewicz) on 19 August 2006. Iweta, who is also an International Master in chess, helps him with the development of Rybka as its tester. In April 2012, the couple was living in Budapest, Hungary and had one child, a son.
In April 2012, Rajlich participated in an April Fools Joke that claimed that he had proven to a 99.99999999% certainty using Rybka that the King's Gambit is at best a draw for white.
On 28 June 2011, the International Computer Games Association (ICGA) determined that Rajlich had plagiarized two other chess software programs: Crafty and Fruit. The ICGA sanction for Vasik Rajlich and Rybka was the disqualification from the World Computer Chess Championship (WCCC) of 2006, 2007, 2008, 2009 and 2010. Vasik Rajlich is banned for life from competing in the WCCC or any other event organized by or sanctioned by the ICGA. Rajlich had already responded to these charges with an e-mail to David Levy, president of the ICGA, in which he stated:
Rybka “does not include game-playing code written by others”, aside from standard exceptions which wouldn’t count as ‘game-playing’. [...] The vague phrase “derived from game-playing code written by others” also does not in my view apply to Rybka