What This COLL Subset Does

U COLL applies when you recognize a U-shaped OLL pattern on the last layer. The U pattern features a "U" shape formed by correctly oriented pieces. U COLL solves both corner orientation and permutation in one algorithm when corners are already oriented, leaving only EPLL to finish.

When to Use: After F2L, if you see a U pattern on the last layer AND all corners are already oriented correctly, you can use U COLL instead of standard OLL + PLL.

Recognition Logic

Step 1: Identify U Pattern

Look for the U-shaped pattern: a "U" formation of correctly oriented pieces. There are variations of U patterns (wide U, narrow U, etc.).

Step 2: Verify Corner Orientation

Ensure all four corners are already oriented correctly. U COLL only works when corners don't need orientation.

Step 3: Identify Corner Permutation

Determine how the corners need to be permuted. U COLL has multiple cases based on different corner swap scenarios.

Example Algorithms

Note: These are examples. Full U COLL subset contains multiple cases based on corner permutation.

Remember: After executing COLL, you'll need to recognize and execute one of four EPLL algorithms to finish the solve.

Why This Subset Is Useful

• Clear Recognition: U patterns are visually distinct and relatively easy to recognize
• Moderate Frequency: U patterns appear in approximately 8-12% of solves
• Time Savings: Can save 1-2 seconds compared to OLL + PLL
• Advanced Optimization: Learning U COLL represents a commitment to advanced CFOP optimization

Common Mistakes

• Confusing U variations: There are multiple U pattern variations; make sure you can distinguish them
• Using COLL when corners need orientation: U COLL only works when corners are already oriented
• Wrong case selection: U COLL has multiple cases; ensure you're using the correct one
• Overlooking EPLL: Remember that COLL solves corners only; edges still need EPLL

Navigation

Resources