Anti Line4

• The player who places four or more pieces in a solid row vertically, horizontally or diagonally, loses the game.
• If the whole game board is full and no player placed four pieces in a solid row, the white player wins.
• It is not allowed to place a piece over the opponent's piece placed at the previous move (except a situation where only one empty column remains). The restriction (for this piece) is not applied at the next moves.