Moving from Beginner to Intermediate
You have mastered the foundational techniques: scanning for naked singles, hidden singles, and using cross-hatching. Here is what changes at the intermediate level and how to prepare.
What Changes at This Level
- •From scanning individual cells → to analyzing groups of cells (subsets)
- •From placing digits directly → to eliminating candidates first
- •Pencilmarks become essential, not optional
- •You’ll track patterns across multiple cells simultaneously
What Changes at the Intermediate Level
1. Pencil Marks Become Essential
At the beginner level, you could often solve cells just by scanning. At the intermediate level, you need complete pencil marks because the techniques work by analyzing groups of candidates, not individual cells. Before attempting intermediate puzzles, make sure you are comfortable filling in and maintaining pencil marks.
2. You Start Eliminating, Not Just Placing
Beginner techniques directly tell you which digit goes in a cell. Intermediate techniques often eliminate candidates from cells instead. For example, a Naked Pair removes two candidates from other cells in the same unit. After eliminating, a simpler technique (like Naked Single) finishes the job.
3. You Look at Pairs and Groups
Instead of looking at one cell at a time, you will learn to spot patterns involving two, three, or four cells that share candidates. These subset techniques (Naked Pairs, Hidden Pairs, etc.) are the backbone of intermediate solving.
Are You Ready? Checklist
- ☐I can solve easy puzzles without hints.
- ☐I understand pencil marks and fill them in systematically.
- ☐I can spot hidden singles by scanning a row, column, or box.
- ☐I know the difference between naked and hidden singles.
- ☐I feel comfortable with all six beginner techniques.