Front view
Find the solved 1×2 block and the adjacent headlights. Unlike T-perm, the solved pieces and swap form the characteristic J-shaped relationship.
J-perm family · PLL Jb
Jb-Perm: recognition, algorithms and execution trainer
Jb-perm is a fast adjacent-swap PLL with a recognizable block and a move rhythm related to T-perm. It is a practical early full-PLL case.
EasyLearning order #2Interactive 3D
Primary algorithm
R U R' F' R U R' U' R' F R2 U' R'Time an execution ↓Interactive demonstration
Inspect and play the case from four angles
Change the viewpoint without changing the case. Then play the selected algorithm turn by turn.
Viewing angle
Algorithm
Recognition
Recognize Jb-Perm from several angles
Right view
Use the bar position plus the direction of the unsolved edge cycle. This view is useful for two-sided recognition without seeing the easiest face.
Back view
Confirm the block remains intact around the back corner. Practice beginning the algorithm without rotating the block to the front.
Left view
Compare against Ja and T using color opposites. The Jb block direction decides whether the standard RUF algorithm matches the case.
Algorithms
Primary and alternatives
Primary
R U R' F' R U R' U' R' F R2 U' R'Recommended starting point for reliable recognition and execution.
RUL alternative
R U2 R' U' R U2 L' U R' U' LReduces F moves at the cost of introducing the left hand and a different block transition.
Back-angle execution
y2 R U R' F' R U R' U' R' F R2 U' R' y2Preserves the familiar primary sequence from the rear recognition angle.
Setup moves
Build the exact case
R U R2 F' R U R U' R' F R U' R'Apply the inverse setup from solved. Random U rotations are essential because Jb is often confused with T or its Ja partner from unfamiliar angles.
Finger tricks
Execute as one controlled phrase
- Start R U R' in home grip and use the right index or thumb for F prime without a full hand rotation.
- Execute R U R' U' as a smooth central trigger.
- Use R' F R2 as one planned transition; align both right layers before the double turn.
- Finish U' R' and perform AUF with the free index finger.
Common mistakes
What usually breaks the case
- Choosing T-perm because the solved block was recognized without checking its direction.
- Pausing before F' or F because the finger assignment was never decided.
- Overshooting R2 after the F move and locking the U layer.
- Learning only the favorite front angle and rotating during every full solve.
Execution-time trainer
Time repeatable executions, not one lucky run
Apply the setup, press the timer button or Space to start, then press again when the algorithm is complete. Times are stored locally; signed-in attempts also contribute privately to aggregate statistics.
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Your average—
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SupaKewber community averageLoading…Shown after five distinct users contribute.
Short demonstration video
Jb-Perm in one quick visual pass
Use the clip for a compact overview, then return to the interactive 3D player to control angle and playback.
Difficulty and order
Easy · recommended case #2
Jb-perm is a common early PLL upgrade after T-perm. Its fast RUF structure rewards good block recognition and deliberate F-move finger tricks.
#2recommended order
Quick answers
Frequently asked questions
What is the difference between Jb and T-perm recognition?
Both show strong blocks, but the solved block and adjacent swap point in different directions; check two side colors.
Is the RUL alternative faster?
It depends on grip and hand preference. Time repeatable averages for both on this page.
Should I learn Ja and Jb together?
They are related, but many solvers stabilize Jb first because its common RUF algorithm is easier.
Put recognition under pressure
Mix this case into a real training session.
Use SupaKewber's algorithm trainers and smart-cube solve analysis to see whether isolated execution transfers into full solves.
Open the trainer