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."
Mojo (board game)
"Mojo" is played with 3 pieces each and a single neutral pawn, used as a blocker, that is common to and may be moved by both players. The game starts with the pawn in the center of the board and during play, there is a choice of 2 empty spaces. Players take turns placing their 3 pieces on the board, one at a time, on any empty position, building on those already on the board, to complete and/or block winning rows. Then, continue by moving any piece (including the opponent's) or the pawn to an adjacent empty space. Players may move the pawn. Pieces and pawns may not jump over each other and the last piece or pawn moved may not be returned to its previous position. The game is over when a player has 3 same-color pieces in a row - horizontally, vertically or diagonally and is then the winner of the game.