From Hard Drop Tetris Wiki
Queue based setups
Queue based setups are dependent on the pieces from the next bag, meaning they are not totally consistent. However, seeing a piece coming early could bump a setup from nail biter to guaranteed save T. While queue bases setups are much, much more extensive, this article will only go into the ones you really should know.
This is not the general setup page. If you're looking for that, Second Perfect Clear.
Coverage setups
Some 2nd perfect clears don't have a good general setup, and are instead entirely encompassed by queuebased setups.
IOSZ
IOSZ early J/L
The setup will need to be mirrored depending on whether you see J or L.
Note: This setup is done with the I piece held. However, since you can see 6 of the 7 pieces in the next bag, you can deduce what the last piece is depending on the piece you do not see.
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IOSZ, I before JL
One minimal save T.
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Solutions:
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IOSZ, SZ before
One minimal save T.
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Solutions:
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ISZT
Comparable to IOSZ in terms of qb ease and saves
L before S
One minimal save O.
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Solutions:
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T before LI
One minimal save O.
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Solutions:
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OS before JLI
One minimal save T.
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Solutions:
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ISZ first
Looks wild, but quite simple. One minimal save O.
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Solutions:
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Optional setups
These are queuebased setups that are not needed, but help quite a bit when solving to save better pieces.
IOSZ
OL first
In case you want some extra save T chances
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Solutions:
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IJLS
Note: IJLS can be quite a hard 2nd to learn, so it's very helpful to learn these 2nds.
Z before S
High cover and easy save t.
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Solutions:
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JO before ISZ
Looks cool and saves T; what's not to love?
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Solutions:
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OS before IJL
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Solutions:
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ISZT
OJ before ILS
Fully optional save T qb.
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Solutions:
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OZ before IJL
Reminiscent of IOSZ solves.
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Solutions:
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IOZT/IOST
Early Z piece
This is an easy 1 solve setup that is guaranteed to save O. This can be also mirrored for early S piece.
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Solutions:
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IJLO
S before TJ
One mininal with save T, good to learn.
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Solutions:
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JLOZ/JLOS
S before OJ
Another great 1-solve guranteed save T.
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Solutions:
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LOSZ/JOSZ
TZ before SJ
Salvaging a terrible pc into a still terrible one
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Solutions:
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TJ before SL
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Solutions:
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Further reading
Stickmancomic's much more extensive doc on queuebased setups