Rubik Cross
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Cross resolution
- Look at edge parity:
- Opposite colors have same parity. Adjacent colors have opposite parities.
- Flipping an edge change its parity.
Cross to F2L
Drill:
- Find the best cross, and list explicitly the moves mentally.
- Predict the moves of every corners, and in particular focus on the corners that will end on the U face.
- From the move list, tell which corners will not move.