• Playing boardgames. This is my profile on BoardGameArena.
  • Watching a variety of sports games, including soccer, basketball, field kockey and curling.
  • Playing floorball.
  • Contributing to Wikipedia.
  • Learning languages, including German, Esperanto and Korean.


  • Amateur 3-dan certificate of Go.
  • Elementary user of Esperanto: Mi ĝojas uzi Esperanton! (I enjoy using Esperanto).
  • Former Mathematical Olympiad participant: I was very fortunate to participante major Mathematical Olympiad competitions in China, Russia and the US, and I won a gold medal from International Mathematical Olympiad in 2009. Please see my profile on the official website of IMO.