Fig: 2nd PC bag structure. Includes DPC Recovery, which involves placing the extra piece in a specific spot compatible with a DPC setup.

It is important to save good pieces for 2nd. Saved pieces are those not used in solve.
In general, 2nd PC has three categories based on parity:

• Has T 2nd - Good 2nd. 100%. Typically easy and good saves for 3rd/DPC.
• No T, even JL 2nd - Still good, but sometimes tricky 2nd. 100%. Typically difficult and slightly worse saves for 3rd/DPC.
• No T, odd JL 2nd - Bad 2nd. No 100%. Bad saves for 3rd/DPC. Avoid at all costs.

In short, try not to use T piece in the 1st PC solve.

* Technically what is a good save may differ slightly based on whether you want to follow up with 3rd or DPC.

Minimal Setups

2nd PC setups marked with ⭐ have 100% combined build cover and 100% solve rate or 100% recovery rate into 100% DPC setups.
You must learn these setups in order to always be able to loop using 2nd PC.

Has T, odd JL 2nd

- TIJO, TIJS, TIJZ, TJOS, TJOZ, TJSZ, (+ TIJL*, TJLS*)

* Some setups can fit in both Has T, odd JL and Has T, even JL categories depending on T orientation.

** Tub + Horizontal I 2nd included because it's easier than Tub + Vertical I 2nd for TIJS 2nd.

Technically Factory 2nd isn't necessary. Factory 2nd is included because it's significantly easier than Heart + PCO 2nd, and because it's used as recovery anyway.

Has T, even JL 2nd

- TIOS, TISZ, TJLO, TJLS, TOSZ, (+ TIJL*)

* Some setups can fit in both Has T, odd JL and Has T, even JL categories depending on T orientation.

No T, even JL 2nd

- IJLO, IJLS, IJSZ, JLOS, JLOZ

Bad 2nd (No T, odd JL 2nd)

Bad 2nd is bad and should be avoided at all costs. Save a better piece on 1st if you can.

- IJOS, IJOZ, IJSZ, JOSZ

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Tub 2nd

⭐ Tub + Vertical I 2nd

Use for:

• ⭐ TIJS 2nd
• ⭐ TJSZ 2nd
• ⭐ TIJL 2nd
• TIJZ 2nd (when possible)

Better saves than Tub + Horizontal I 2nd, but harder to solve.

Minimals (7)

Extra (7)

Extra Save O (7)

Rather than memorising minimals, it's easier to just solve box using a larger number of simple solves.
The last 180 minimal is the only one you need to memorise.

Tub + Vertical I has 0.24% forced save I. These queues are OSZ<I<JL<T. This solve requires 180:

Fig: Tub + Vertical I forced save I minimal 180 spin.

Forced save I can be avoided by placing O at the wall:

Sometimes it's possible to get extra Tet with 180:

Fig: Tub + Vertical I Tet 180 spin.

🩹 Tub + Vertical I on the wrong side Recovery

If you build Tub + Vertical I on the wrong side, those 0.24% forced save I queues actually become fail queues. In that case, use this recovery:

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Tub + Horizontal I 2nd

Simpler to solve than Tub + Vertical I 2nd, but worse saves.

Minimals (2)

Extra (4)

Extra Save O (2)

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⭐ Broken Tub 2nd

Use for:

• ⭐ TIJZ 2nd (when Tub + Vertical I not possible)

Minimals (4)

Extra (9)

Curated Extra Save O (3)

The above three simple save O solves bring save O chance to 87.14%. Other solves not listed here exist (see Unique Solves).

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Factory 2nd

Use for:

• ⭐ TIJO 2nd
• ⭐ TJOS 2nd

Factory 2nd is a setup family. Factory setups vary depending on whether space divisions are connected to the central box segment or disconnected.
Factory variants with O space connected to box space can use solves that span the space division boundary. Always build one of these variants.
Factory variants with O space connected to box space can use 180 solve that makes use of the side being only 2 high.
Factory variants with T space connected to box space can use 180 solve that makes use of the side being only 3 high.

Always build variants with O space connected to box space.

Factory variants with O space connected to box space can use solves that span the space division boundary:

⭐ Factory OT (100%) 2nd

Minimals (7)

Extra (2)

Factory variants with O space connected to box space can use 180 solve that makes use of the side being only 2 high:

Fig: Factory OT/OX variants-exclusive 180 spin.

Factory variants with T space connected to box space can use 180 solve that makes use of the side being only 3 high:

Fig: Factory OT/TX variants-exclusive 180 spin.

All Factory variants can use this 180 to increase Tet chance:

Fig: Factory universal 180 spins.

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Factory OX (99.68%) 2nd

Minimals (8)

Extra (1)

Factory variants with O space connected to box space can use 180 solve that makes use of the side being only 2 high:

Fig: Factory OT/OX variants-exclusive 180 spin.

All Factory variants can use this 180 to increase Tet chance:

Fig: Factory universal 180 spins.

🩹 Factory Recovery

Depending on which column you placed the first O, you will be able to go into S Recovery DPC (at the wall) or S Recovery DPC (in the middle).
Just be careful not to clog the holes for T and second of J/L with S/Z you dumped on top.

This recovery can also be used to avoid the forced save I minimals.

O in the middle Recovery

Recovery (1)

O at the wall Recovery

Recovery (1)

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⭐ Heart + PCO 2nd

Use for:

• ⭐ TJOZ 2nd

Very difficult to solve without a method.

TIJO 2nd, TIJZ 2nd: Can mirror.

Minimals (9)

Extra Save O (5)

Assuming you're following up with DPC, look for solves in the following order:

1. Save O Tet solves (minimals 1-2)
2. Save O JLSZ qb skims (minimal 3, extras 2-4)
3. Save O JLT qb skims (minimal 4, extras 5)
4. Save S 3x4 box annoying minimals (minimals 5-6)
5. Save S 5x4 box (minimals 7-8)
6. Save T 5x4 box (minimals 9)

Space divisions make finding solves simpler:

Box solves

Annoying minimals

JLSZ qb skims

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⭐ Mound + IO 3p (Hold O) 2nd

Use for:

• ⭐ TIOS 2nd

Minimals (5)

Extra (8/16)

Simple Extra Save O (2/4)

Partially symmetrical setup. Can always hold O and partially mirror setup to improve score, saves, and make the setup easier to solve.

Most of the time you will be able to build the TS0+Tet extra solve (often without the spin/Tet) or one of the first 2/4 extra save O solves.

Other extra save O solves exist. Not listed because of their difficulty.

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⭐ TISZ Hat 2nd

Use for:

• ⭐ TISZ 2nd

Minimals (2)

Extra (1)

Symmetrical setup. Can mirror. Mirror based on early J/L (place flat in corner).

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⭐ TJLO 2nd

Use for:

• ⭐ TJLO 2nd

Minimals (2)

Symmetrical setup. Don't need to mirror.

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⭐ TJLS 3p (Hold J) 2nd

Use for:

• ⭐ TJLS 2nd

Minimals (2)

Extra (7)

Simple Extra Save O (1)

Not symmetrical! Trying to mirror may result in T being impossible to place after JS have already been placed.

Other extra save O solves exist. Not listed because of their difficulty.

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⭐ TOSZ 3p (Hold Z) 2nd

Use for:

• ⭐ TOSZ 2nd

Minimals (3)

Extra (3)

Symmetrical setup. Don't need to mirror.
Can mirror for chance of better solve.

Extra save O solves exist. Not listed because of their difficulty.

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⭐ Horizontal Box 3p (Hold I) 2nd

Use for:

• ⭐ IJLO 2nd
• ⭐ IJLS 2nd

Minimals (6/11)

Extra (3/6)

Partially symmetrical setup.

Extra save O solves exist. Not listed because of their difficulty.

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⭐ IOSZ 3p (Hold I) 2nd

Use for:

• ⭐ IOSZ 2nd

* stats for correct mirror (excluded queues with L and no J among first 4)

Minimals (6)

Extra (2)

Symmetrical setup. Must mirror to retain 100% solve rate.
All fail queues include LOSZ.
If you see only J, build as shown.
If you see only L, mirror the setup.
If you see both or neither, build on either side.
A good way to remember which side to build on is to imagine the J piece fitting on top of the OSZ 3p:

However the piece isn't fixed there. That space can be filled by IJ or LO.

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⭐ Horizontal Box 3p (Hold O) 2nd

Use for:

• ⭐ JLOS 2nd

Minimals (9)

Extra (2)

Almost always can place O in the middle. Only exception are the last two minimals, which require 180 utilising O in the other corner:

Fig: Box + O 2nd Sneakers 180 spin. J can only be spun in before second O has been placed.

Fig: Box + O 2nd Sneakers 180 spin. L can only be spun in before I has been placed.

Partially symmetrical setup. Place O on the other side if you can get a better solve.

Other extra save O solves exist. Not listed because of their difficulty.

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⭐ JLSZ 2nd

Use for:

• ⭐ JLSZ 2nd

Minimals (8)

Extra (1)

Simple Extra Save T (1)

Symmetrical setup. Don't need to mirror.
Can mirror for chance of better solve.

Space divisions make finding solves simpler:

Other extra save O/save T solves exist. Not listed because of their difficulty.

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⭐ Sneakers 2nd

Use for:

• ⭐ IJOS 2nd
• ⭐ IJSZ 2nd
• ⭐ OJSZ 2nd

Minimals (3)

Building Sneakers sometimes requires using kicks:

Fig: IJOS 2nd Sneakers I-spin. Grey ▄█▄ shows piece orientation for clarity.

Fig: IJSZ 2nd Sneakers I-spin. Grey ▄█▄ shows piece orientation for clarity.

Fig: IJSZ 2nd Sneakers S-spin. Grey ▄█▄ shows piece orientation for clarity.

🩹 Recovery (2)

When no solve, Sneakers can build recovery into T DPC residue with a series of skims:

Fig: Sneakers J skim recovery.

Fig: Sneakers ZI skim recovery.

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⭐ Cactus 3p (Hold J) 2nd

Use for:

• ⭐ IJOZ 2nd

Minimals (13)

Extra (1)

🩹 Recovery (8)

This recovery into O DPC can always be built.
First recovery covers all fail queues. You likely don't need all of these since the setup is 98.73%.
They're also good to know as save O solves.

J can be spun in with 180 after O has been placed:

Fig: Cactus 2nd recovery J spin sequence.

Extra save O solves exist. Not listed because of their difficulty.

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Changelog

2023-02-17
• Added No T, even JL 2nd minimal setups
• Added minimal setup - Horizontal Box 3p (Hold I) 2nd
• Added minimal setup - IOSZ 3p (Hold I) 2nd
• Added minimal setup - Horizontal Box 3p (Hold O) 2nd
• Added minimal setup - JLSZ 2nd

2023-02-16
• Added Has T, even JL 2nd minimal setups
• Added minimal setup - Mound + IO 3p (Hold O) 2nd 2nd
• Added minimal setup - TISZ Hat 2nd
• Added minimal setup - TJLO 2nd
• Added minimal setup - TJLS 3p (Hold J) 2nd
• Added minimal setup - TOSZ 3p (Hold Z) 2nd
• Added Bad 2nd (No T, odd JL 2nd) minimal setups
• Added minimal setup - Sneakers 2nd
• Added minimal setup - Cactus 3p (Hold J) 2nd

2023-02-12
• Created Minimal 2nd PC page
• Added Has T, odd JL 2nd minimal setups
• Added minimal setup - Tub + Vertical I 2nd
• Added minimal setup - Broken Tub 2nd
• Added optional setup - Tub + Horizontal I 2nd
• Added minimal setup - Factory OT (100%) 2nd
• Added optional setup - Factory OX (99.68%) 2nd
• Added minimal setup - Heart + PCO 2nd