Lesson 10: Advanced stacking

In 20G mode, movement is limited, therefore it is important to build a good terrain.
Lesson 6 showed that the fifth columns is the best for this.

Keep room on the right for the I

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There need to be 2 rows empty in the 9th column to place an I in the tenth column. That is why we place the T as such and not in the ninth column.

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The hole left here can always be filled by a J, and we have an I next.

These are all ways to fill up holes left to keep room for the I.

These are also useful for this purpose.

This is how you should rotate a T into place.

Here's how to hook blocks onto something

in this case, this is the best place for the Z. The hole left can be filled by 2 blocks, but keeping room for the I is more important.

Keeping room for the I on the left.

The I needs a 3 x 2 space on the left, like this. The O is most useful for creating a stage for this.

Lesson 7 explained this trick.

Putting these blocks in any onther way would block the upcoming I.

Waiting for a block

Like this, you can leave a hole for the S to fill using a wallkick later.

The J and L can be put vertical like this to leave room for something.

given a 3 x 2 hole you can wallkick a J or L into it.

Compromise

It is inevitable that you sometimes have to place a block in a sub-optimal position. You should not try to let the block fall in the fifth column.

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You can fill a hollow place to not heighten the stack.

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A less obvious example, note that it leaves place for an S.

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Another case of not increasing the height.

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In this case a J and a T would partially solve the problem, therefore it is important not to let the I fall into the middle.