Non-overstacking construction

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Overstacking can be very dangerous against an aggressive opponent. If a player is not able to get down to the garbage efficiently, he'll be overwhelmed by garbage.

Fundamental

In this situation, a player overstacks and takes longer to get down to the garbage.

..........
..........
..GGGGG...
G.GGGGGGGG
G.GGGGGGGG
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
..........
........T.
..GGGGGTTT
G.GGGGGGGG
G.GGGGGGGG
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G

Drop T above
clogged rectum

...J......
...JJJ..T.
..GGGGGTTT
G.GGGGGGGG
G.GGGGGGGG
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G

Drop J

...J......
...JJJ..T.
LLGGGGGTTT
GLGGGGGGGG
GLGGGGGGGG
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G

Drop L for
triple

..........
..........
..........
...J......
...JJJ..T.
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G

Naive gravity

With the same sequence of pieces, a player can opt to switch the position of the T and the J, resulting in a clean opening for the garbage.

..........
..........
..GGGGG...
G.GGGGGGGG
G.GGGGGGGG
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
....T.....
...TTT....
..GGGGG...
G.GGGGGGGG
G.GGGGGGGG
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
....T.....
...TTT.J..
..GGGGGJJJ
G.GGGGGGGG
G.GGGGGGGG
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
....T.....
...TTT.J..
LLGGGGGJJJ
GLGGGGGGGG
GLGGGGGGGG
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
..........
..........
..........
....T.....
...TTT.J..
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G
GGGGGGGG.G


Towering

When facing an ever changing system of garbage, often, a player has to make the field uneven in height to avoid overstacking.

..........
.....Z....
....ZZ....
...GZGG...
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GG.GGGGGGG
GG.GGGGGGG
..........
L....Z....
L...ZZ....
LL.GZGG...
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GG.GGGGGGG
GG.GGGGGGG
...T......
L..TTZ....
L..TZZ....
LL.GZGG...
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GG.GGGGGGG
GG.GGGGGGG
...T......
L..TTZ....
L..TZZ....
LL.GZGG...
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI
GG.GGGGGGG
GG.GGGGGGG
..........
..........
..........
..........
...T......
L..TTZ....
L..TZZ....
LL.GZGG...
GG.GGGGGGG
GG.GGGGGGG

Be wary when towering because it's not always productive. If a player is not careful, he may end up severely decreasing his options in tetromino placement. Sometimes a bit of planning based on the piece preview may help:

..........
..........
......ZZ..
...G.GGZZ.
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GG.GGGGGGG
GG.GGGGGGG
..........
.....LLL..
.....LZZ..
...G.GGZZ.
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GG.GGGGGGG
GG.GGGGGGG
..........
....TLLL..
...TTLZZ..
...GTGGZZ.
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GGGGGGGGG.
GG.GGGGGGG
GG.GGGGGGG
..........
....TLLL..
...TTLZZ..
...GTGGZZ.
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI
GG.GGGGGGG
GG.GGGGGGG
..........
..........
..........
..........
..........
....TLLL..
...TTLZZ..
...GTGGZZ.
GG.GGGGGGG
GG.GGGGGGG

Foresight

When a player is confronted by diverging garbage columns, remember to also stack low in the column where the lower empty column resides. Don't always chase after the nearest empty column and cover the path to the next column.


In this diagram scenario, a player has to take an extra step in clearing a single towards the end.

..........
..........
..GGGGGGGG
G.GGGGGGGG
GGG.GGGGGG
GGG.GGGGGG
GGGGGGG.GG
GGGGGGG.GG
GGGGGGG.GG
..........
......IIII
..GGGGGGGG
G.GGGGGGGG
GGGG.GGGGG
GGGG.GGGGG
GGGGGGG.GG
GGGGGGG.GG
GGGGGGG.GG
..........
S.....IIII
SSGGGGGGGG
GSGGGGGGGG
GGGG.GGGGG
GGGG.GGGGG
GGGGGGG.GG
GGGGGGG.GG
GGGGGGG.GG
..........
..........
..........
S...JJIIII
GGGGJGGGGG
GGGGJGGGGG
GGGGGGG.GG
GGGGGGG.GG
GGGGGGG.GG
..........
..........
..........
..........
..........
S...JJIIII
GGGGGGG.GG
GGGGGGG.GG
GGGGGGG.GG


With the same sequence of pieces, the player can spend less time in reaching the lower empty column.

..........
..........
..GGGGGGGG
G.GGGGGGGG
GGG.GGGGGG
GGG.GGGGGG
GGGGGGG.GG
GGGGGGG.GG
GGGGGGG.GG
.........I
.........I
..GGGGGGGG
G.GGGGGGGG
GGGG.GGGGG
GGGG.GGGGG
GGGGGGG.GG
GGGGGGG.GG
GGGGGGG.GG
.........I
S........I
SSGGGGGGGG
GSGGGGGGGG
GGGG.GGGGG
GGGG.GGGGG
GGGGGGG.GG
GGGGGGG.GG
GGGGGGG.GG
.........I
.........I
.........I
S...JJ...I
GGGGJGGGGG
GGGGJGGGGG
GGGGGGG.GG
GGGGGGG.GG
GGGGGGG.GG
..........
..........
.........I
.........I
.........I
S...JJ...I
GGGGGGG.GG
GGGGGGG.GG
GGGGGGG.GG