OPA
From Speedsolving.com Wiki
OPA (OLL Parity Avoidance) is a 4x4 speedsolving method where you can avoid OLL parity on a 4x4 (or possibly ever larger cubes). It's usually used together with Reduction or Yau.
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OPA (OLL Parity Avoidance) is a 4x4 speedsolving method where you can avoid OLL parity on a 4x4 (or possibly ever larger cubes). It's usually used together with Reduction or Yau.
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