Creating a temporary gap and then soft dropping a piece under it allows players to get out of some tricky situations. In a way, it functions similarly to holding a piece. Players are able to place pieces out of order.

Examples of sliding

It is not always necessary to have a plan in advance if you have a good feel for it.

This is an interesting dilemma. The first is fine--if you happen to get another L- or J-piece in time. The second one forces you to depend on the J-piece instead of either J or L. However, the second is not a bad choice since it allows you to connect the 7th and 8th columns to the left side of the field. This gives you additional options to stack over.

Below is a very useful tactic, pioneered by player Integration. It is more useful to have nine connected columns compared to eight. If you create a 4x1 indention next to the Tetrising column, you will always be able to fill in that I-piece later. In the meanwhile, by stacking over it, you gain more options for placing pieces.

This possibility can affect decisions such as below, which may otherwise seem evenly good.

Diagrams made with tage.

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