Go (game)
The playing pieces are called "stones". One player uses the white stones and the other, black. The players take turns placing the stones on the vacant intersections ("points") of a board. Once placed on the board, stones may not be moved, but stones are removed from the board if "captured". Capture happens when a stone or group of stones is surrounded by opposing stones on all orthogonally-adjacent points. The game proceeds until neither player wishes to make another move. When a game concludes, the winner is determined by counting each player's surrounded territory along with captured stones and komi (points added to the score of the player with the white stones as compensation for playing second). Games may also be terminated by resignation. A teacher might simplify the explanation by saying to a student "you may place your stone on any point on the board, but if I surround that stone, I will remove it."
Gossaum
Each Go is around 15m long, and consists of a large straw loop at the end of a long, thick cylinder, supported on poles. Two "tails", at the opposite end of the structure from the loop, serve to provide a rudimentary steering mechanism. During play, the two Go are lifted above head height by the teams, and the loops are brought into contact and pushed against one another. Due to the ritual nature of the contest, one team's Go is larger than the other, making the contest somewhat one-sided.