PlaySudoku.us
Evil · Puzzle #491
4
2
7
6
7
5
9
1
1
8
3
9
3
6
1
8
2
1
5
5
7
4
9
Techniques used
- Hidden Single
- Naked Pair
- Naked Triple
- Pointing Pair
- Box-Line Reduction
- Skyscraper
- UR Type 1
- Forcing Chains
- Naked Single
- W-Wing
- XY-Chain
Graph coloring and Sudoku are equivalent problems. Each cell is a node; edges connect cells that share a house. Solving Sudoku = coloring the graph with 9 colors.
Graph coloring and Sudoku are equivalent problems. Each cell is a node; edges connect cells that share a house. Solving Sudoku = coloring the graph with 9 colors.
"Plato is dear to me, but dearer still is truth." — Aristotle
"Plato is dear to me, but dearer still is truth." — Aristotle