Kapnisis was born on March 16, 1988, in Athens, Greece. He developed an interest in chess at an early age, and quickly demonstrated his aptitude for the game. He has achieved various high placings in prominent tournaments, marking him as one of Greece’s influential chess players.
One of his most notable accomplishments was earning the title of International Master (IM) in 2008. In 2015, Kapnisis was awarded the prestigious title of Grandmaster (GM), the highest title a chess player can attain.