Which game is a chess variant, Ubongo or Ouk-Khmer?
Ubongo Ubongo is a board game developed by Polish-born Swedish game designer Grzegorz Rejchtman. It originally appeared as "Pyramidens Portar" by the Swedish publisher Kärnan and won the Swedish "Årets spel" prize in 2003. The game was later released in Germany in 2005 as "Ubongo" by the publisher Kosmos and got 4th place at the German board game competition and was among the finalists in the International Gamers Award.
Tandem simultaneous exhibition A tandem simultaneous exhibition or leapfrog simultaneous exhibition or partnership chess is a form of simultaneous exhibition in which more than one players (typically of high rank, such as a grandmaster or dan-level player) play multiple games at a time with a number of other players, making successive moves without consulting one another. Such an exhibition is often referred to simply as a "tandem simul" or "leapfrog simul". When conducted by more than two experts, it is often called a sequential simul.