Chains and Loops
![](/gfx/sep.gif)
Advanced Sudoku Strategies - Chains and Loops
Forcing ChainGeneric term for any type of chain.
X-Chain
Single digit chain of cells.
XY-Chain
Chain of bivalue cells.
Remote Pairs
Simplified form of XY-Chain, involving only two digits.
Fishy Cycle| X-Cycle
Single digit continuous loop.
Broken Wing
Eliminations caused by loops of odd length.
Nice Loops
Several types of loops formed by cells following strict rules and a notation system.
Double Implication Chain| DIC
There are 2 interpretations circulating. The first originates from a reliable source [1].
A Forcing Chain that has implications in both directions.
2 Forcing Chains starting from a bivalue cell or a bilocal unit showing a verity.
Alternating Inference Chain| AIC
A chain where each node is a candidate, with alternating strong and weak inference.
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
![](/gfx/sep2.gif)
![](/gfx/sep2.gif)
Printable Sudoku
- Kids Sudoku Puzzles
- Easy Sudoku Puzzles
- Standard Sudoko Puzzles
- Hard Sudoku Puzzles
- Expert Soduko Puzzles
- Extreme Soduku Puzzles
- Blank Sudoku Grids
![](/gfx/sep2.gif)
Sudoku Links
![sudoku cool](/image/en.png)
![sudoku schwer](/image/de.png)
![sudoku gratuit](/image/fr.png)
![sudoku gratis](/image/es.png)
![数独](/image/zh.png)
![数独](/image/ja.png)
![Судоку онлайн бесплатно](/image/ru.png)
![数独](/image/ja.png)
![今日数独](/image/zh.png)
![武士数独](/image/zh.png)