Advanced Techniques Overview

Your Roadmap to Expert Solving

When basic and intermediate techniques aren't enough, you'll need to master advanced strategies. This guide organizes them by category to help you build your skills systematically.

Fish Patterns

Fish patterns use candidate alignment across multiple rows/columns to create eliminations. Start with X-Wing and work up.

Wing Techniques

Wing patterns use bi-value cells arranged in specific configurations. The logic is similar across all wing types.

Chain Techniques

Chain techniques track candidates through connected cells using strong and weak links. They're powerful but complex.

Uniqueness Techniques

These techniques use the fact that valid Sudokus have exactly one solution to eliminate candidates.

Single-Digit Patterns

These patterns focus on one digit at a time, using geometric relationships.

Learning Roadmap

We recommend learning advanced techniques in this order:

1. X-Wing — The gateway to fish patterns
2. Y-Wing — Foundation of wing techniques
3. Simple Coloring — Introduction to chains
4. Swordfish — Extended fish pattern
5. Unique Rectangle — Uniqueness logic
6. XYZ-Wing and X-Cycle — More complex patterns
7. XY-Chain — Extended chain logic

Advanced

Start with X-Wing

The classic fish pattern — your first step into advanced territory.