7th PC (Algebruh)
The following setups have been curated by Algebruh with the goal of minimizing the number of solutions for each case of 7th.
7th is one of the easiest PCs once you devote the time to it. You have 3 pieces that will be used in the setup, (although, sometimes you use only 2) and a full bag will be used in the solution, leaving you at 1st. Some setups are being looked into for going into 8th instead, but they are incredibly advanced, and generally niche.
Setups will be generally ordered based on minimal count (but that might not be an exact correlation to the difficulty).
With T 7ths
One Minimal Setups / “Flats”
Setups for 7ths that contain T with S or Z, without L and J.
TIS
Hold O/T until everything is placed
TIO
Hold S until everything is placed. Watch out for the funny Z spin!
TSO
Hold T until everything is placed.
"Locked LO" Setups
Setups for 7ths that contain T with L or J, without S and Z. The category is named as such because the two solutions for these will always place L and O in the same place.
TIL, TLJ, TLO Setup
Solutions are based on the order of T and Z. You can perform a 180 rotation on the J piece to fit it in the solution, as illustrated by the third image.
- Solution 1, Z before T, holding I
- Solution 2: T before Z, holding L
“Mound” Setups
Setups that use TS or TZ to create a “mound”, with L or J. Place the mound on the left if you have L and on the right if you have J.
Mound + L
Solutions are based on the order of T and Z.
- Solution 1, T before Z, hold L and 180 J if SO before J
- Solution 2 and 3: Z before T. Change the box generally based on LJ order, but order gets confusing when LJ comes before T, so be careful. It may be useful to just freestyle the box to minimize the amount of thinking needed to switch between minimals.
TSZ Anti-PCO Setup
Notably, you get to this PC when you take a 2 line PC on O 3rd, and is relatively high in scoring, with multiple T-spin solutions.
TSZ
The solution 1 can occasionally get you a TSD, and the other two solutions are for when you get an early I and cannot use solution 1.
Solution 3 is very rare to need to do, so it’s relatively safe to avoid it.
Here are five more solutions that can give more points using T-Spin opportunities.
Without T 7ths
Generally, 7ths without T are a bit harder and have more minimals, but the most minimals for one setup in this set is still just 5.
LJS
- Solution 1: S before J, hold L
- Solution 2: J before S, hold T
ISO
- Solution 1: T before Z, hold L
- Solution 2: Z before T, hold L
ILJ
- Solution 1: TZ before J, hold J
- Solution 2: either T or Z before J, hold T
LJO
- Solution 1: Z before J, hold T
- Solution 2 and 3: J before Z
ILO
- Solution 1: T before S (hold J until everything is placed)
- Solution 2 and 3: S before T; the box changes based on the JZ order (J before Z and Z before J respectively) and hold L until everything is placed.
Heart + O
A shape that resembles a heart (3×3 with missing corner) and O joined together.
Heart + O
All solutions except for the last one are simple 4×4 box solutions, filling the middle with IJ or IL.
The last one is used for early TLZ queues. Check if you can use it first to avoid passing up using it when you actually should.
For some queues that use this shape, you can hold S or Z in order to reduce the number of minimals to 3, removing the non-box solution:
Generally the solution are based on the order of TSZ, holding L.
- Solution 1: Z before S, hold L
- Solution 2: TS before Z, T before S, hold L
- Solution 3: S before TZ, hold L
Bad 7ths
These are the only 4 queues that are not 100% with one setup, and need queue-based setups to get to 100%. The general setups range from 99.52% (ISZ dragon) to 89.13% (SZO jaws). The following setups are queue-based setups.
ISZ
ISZ is definitely the “best of the worst” of these 7ths (right next to SZO), as it’s relatively easy to learn these queue-based setups. In order to get the fullest out of these, and to avoid using the actual setup: prioritize the O QB, then the L and J QBs, and then the TSZ QB as an absolute fallback case.
L before O
This setup is for if you can access L, or if you see the L piece and it’s before O. If you can’t immediately access L (when L is in the last two pieces of your queue), you still can decide the solution that you will use and place L then.
This setup does have fail queues if L is the third/fourth piece in the queue, but those always have different QBs that could have been used earlier.
- Solution 1: LSZ before I or SZ before L, use Solution 2 otherwise.
You can just mirror the “access L setup” for if you see J. The same rules apply, just see above and mirror.
O
This setup is for if O is within the first three pieces of your next queue.
TSZ
This setup is for if the next three pieces are TSZ.
LSZ
The QB setups for LSZ 7th are a little strict in how you choose them, if you want to minimize the amount of needed learning. It’s got a lot more setups than ISZ, but it shouldn’t be too daunting. Most queue-based setups have only one solution, with one outlier having four very similar solutions.
SO
Hold L until T is placed.
IS
Hold J until T is placed.
TI
This one uses the T and I pieces. LSZ is shifted to make sure the I spin will always work.
JO
Hold J until T is placed.
IS/TS
Hold L until T is placed.
IJO
If everything else doesn't work, use this.
SZO
This 7th does actually have some very simple queue-based setups, despite having the worst general setup of all of them.
See I
The solution is based on which piece is last out of L, J, S and Z.
See T
Make sure to mirror based on if you see L or J. These images are for See L.
For queues where you can't see both L and J, you can build the setup on any side and take the second solution.
The solutions themselves are generally based around where the SZ pieces are in the queue.
See L, No TI
Make sure to mirror based on if you see L or J. These images are for See L.
This is for LSZO queues. Hold the Z piece while placing LSO, and then spin Z in. You have a guaranteed TSS or TSD, as well!
See LJ, No TI
The solutions are based on SZ order.