X-Chain , How to solve sudoku puzzles - Solving sudoku strategy

This diabolical puzzle was the daily on the Sudoku app today : r/sudoku

XY-Chains

XY-Chain , How to solve sudoku puzzles - Solving sudoku strategy

A typical 9 × 9 sudoku puzzle: (a) original problem and (b)

Sudoku Solving by Probability Models and Markov Chains - Department of Mathematics

X-Wing Strategy

HoDoKu: Solving Techniques - Chains and Loops

How to solve Sudoku? Techniques and tricks to solve Sudoku puzzle

Is there a Sudoku puzzle where you can start with 1 and find all 1's, then move to 2, and so forth until 9, so that you solve the entire puzzle in

HoDoKu: Solving Techniques - Chains and Loops

Jet Sudoku - X chain