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# Solving Sudoku Methods Explained

A number game (Sudoku) is a puzzle in which missing numbers are to be filled into a 9 by 9 grid of squares which are subdivided into 3 by 3 boxes so that every row, every column, and every box contains the numbers 1 through 9.

Methods to solve Sudoku puzzles (or Create Sudoku puzzles) include but not limited to:

### Basic Solving Sudoku Methods

###### Elimination  a.k.a Hidden Single , or Loner .

Basic solving sudoku methods do not need you to write down the candidate values for empty squares. Usually very easy or easy Sudoku puzzles can be solved by using basic solving methods.

###### XYZ-Wing

Advanced solving sudoku methods need you to write down the candidate values for blank/empty squares. Usually medium, hard, and very hard Sudoku puzzles need to be solved using both basic and advanced solving sudoku methods.

### Solve Sudoku - Last Resort

###### a.k.a. Guess-and-check, nishio (Japanese name), or ConflictElimination & Exhaustive Search , or Brute Force

Guessing method needs you to write down the candidate values for blank/empty squares. Usually very hard Sudoku puzzles need to be solved using basic, advanced solving sudoku methods, and guessing method.

### Our solver applies methods in the following order:

• OneChoice
• Row-Elimination, Column-Elimination, Box-Elimination
• Subset2Row, Subset2Col, Subset2Box
• SubsetPosition2Row, SubsetPosition2Col, SubsetPosition2Box
• Interaction-RowBox, Interaction-ColBox, Interaction-BoxRow, Interaction-BoxCol
• Subset3Row, Subset3Col, Subset3Box, SubsetPosition3Row
• SubsetPosition3Col, SubsetPosition3Box
• Subset4Row, Subset4Col, Subset4Box
• SubsetPosition4Row, SubsetPosition4Col, SubsetPosition4Box
• DoubleRowsOneDigitCheck(X-Wing), DoubleColsOneDigitCheck(X-Wing)
• TripleRowsOneDigitCheck, TripleColsOneDigitCheck
• XY-Wing-RowBox, XY-Wing-ColBox, XY-Wing-RowCol
• XYZ-Wing- RowBox, XYZ-Wing-RowBox
• ConflictElimination, Exhaustive Search

##### Solving Sudoku Methods Explained

This article answers questions: What are commonly used solving sudoku methods? What solving Sudoku methods do we use? In what sequences?

##### Basic Solving Sudoku Method: One Choice

a.k.a Sole Candidate, Only Candidate, or Naked Single

##### Basic Solving Sudoku Method: Elimination

a.k.a Hidden Single, Loner

##### Advanced Solving Sudoku Method: Subset2

a.k.a Pair, Naked Pair, or Naked Twins

##### Advanced Solving Sudoku Method: SubsetPosition2

a.k.a Hidden Pair or Hidden Twins

Last updated 3 mins ago

##### Advanced Solving Sudoku Method: Interaction

a.k.a Box/Row Claim or Intersection , or Locked Candidates

##### Solving Sudoku Methods Explained

This article answers questions: What are commonly used solving sudoku methods? What solving Sudoku methods do we use? In what sequences?