Beschreibung
Board & Pieces
T4 is played between two opponents on a 4x4 square board.
Each player has 16 units of 3 different kinds of pieces, 48 pieces in total. No pieces are placed on the board when the game starts.

Movements
Players take the following 2 actions in one turn:
Take one of his/her pieces from outside the board and place it at an empty square on the board, then,
Move a piece or a set of pieces from one square to another on the board.

Pieces can be placed at any empty squares or at already-occupied squares in condition that already-placed pieces are different kind(s) from the one that is going to be placed.

Accordingly, how pieces are placed at a square are 7 different ways as follows: 3 different single pieces and 4 different combination (sets) of pieces. 　

After placing a piece on the board, players move a piece or a set of pieces from a square to another.

Players can choose to move either a single piece or a set of pieces together, but cannot move a single piece out of a set of pieces from a square.

Pieces are moved as Queen in Chess: They can be moved any number of vacant squares diagonally, horizontally, or vertically.

Jumping over other pieces or moving to an already-occupied square is not allowed.

Goal
The player who succeeds in placing 3 respective (single) pieces or set of pieces in a horizontal, vertical, or diagonal row wins the game.

The player loses when he/she cannot move his/her piece(s).

The player who places 4 respective pieces or combination of pieces in a horizontal, vertical, or diagonal row loses the game.(This rarely happens.)