Pong Hau K´i
Pong Hau K'i (Chinese: 裤裆棋, pinyin: kùdāng qí, Cantonese: Pong Hau K'i/bong1 hau2 kei4 䦁口棋 (𨧜口棋 traditional)) is a Chinese traditional board game for two players. In Korea, it is known as Ou-moul-ko-no or Umul Gonu (우물고누) or as Gang Gonu (강고누). "Umul" translates as "a spring", and the appearance of the board is like that of a spring in the center, with water running out in all directions. "Gang" translates as "river", and has a similar interpretation. Equivalent games are also played in Thailand (Sua tok tong) and in northern India (Punjab: Do-guti).
The board consists of 5 vertices and 7 edges. Each player has two pieces. Players take turns to move. At each turn, the player moves one of their two pieces into the adjacent vacant vertex. If a player can't move, they lose.
Only one type of position can make a player lose. If both players play perfectly, the game continues endlessly with no winner.
It is a children's game in both China and Korea, and is often used for childhood education.