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
- Sudoku 9981
- Samurai Sudoku
- Sudoku Printer
- Word Sudoku to Learn English
Word Sudoku to Learn Chinese
Word Sudoku to Learn French
Word Sudoku to Learn German
Word Sudoku to Learn Spanish
Free Sudoku Script for Your Website
Sudoku strategies
- Coloring
- Singles
- Fish
- Chains and Loops
- Intersections
- Subsets
- Wings
- Single Digit Patterns
- Uniqueness
- Almost Locked Sets
