Sometimes, a player needs to break back-to-back and clear lines with different methods. This is especially necessary in multiplayer to clear garbage efficiently. Make use of the different properties of the seven tetrominoes. Don't always clear lines in the most obvious manner because it might not be the optimal method. Think outside of the box.
For this diagram situation, a Z is the obvious fit to clear a double but there are better choices.
In this diagram situation, an O would fit snugly but it's not optimal and forces you to clear two singles.
