# Subsets

Complex problems can often be solved by finding ways to split them into several smaller problems. In a Sudoku, each house is a problem that has 362880 possible solutions (the possible permutations for the 9 digits). To reduce this number, a player will try to isolate groups of cells and digits from the remainder of the house.

When N cells and N digits are isolated, a subset of size N is formed.

Alternative terms are disjoint subset, locked set and number chain.

### Solving Sudoku Strategy - Subsets

**Naked Pair**2 cells with candidates for 2 digits.

**Naked Triple **
3 cells with candidates for 3 digits.

**Naked Quad**
4 cells with candidates for 4 digits.

**Hidden Pair**
2 digits with candidates in 2 cells.

**Hidden Triple **
3 digits with candidates in 3 cells.

**Hidden Quad**
4 digits with candidates in 4 cells.

## Sudoku Games

*Free Sudoku Script for Your Website*

## Sudoku strategies

- Coloring
- Singles
- Fish
- Chains and Loops
- Intersections
- Subsets
- Wings
- Single Digit Patterns
- Uniqueness
- Almost Locked Sets

## Printable Sudoku

- Kids Sudoku Puzzles
- Easy Sudoku Puzzles
- Standard Sudoko Puzzles
- Hard Sudoku Puzzles
- Expert Soduko Puzzles
- Extreme Soduku Puzzles
- Blank Sudoku Grids