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### One Choice Method - Basic Solving Sudoku Technique

One-Choice, or Sole Candidate, or Only Candidate, or Naked Single

###### One-Choice by Mensa Guide to Solving Sudoku a.k.a. Sole Candidate by Kristanix.com a.k.a. Only Candidate by humage.coma.k.a. Naked Single by hodoku

One-Choice, or Sole Candidate, or Only Candidate, or Naked Single:

An empty square can only be filled with a number because all other numbers are taken in its row, column, or box.

Below is an example of using One-Choice(a.k.a. Sole Candidate, or Naked Single) to fill R1C1 (the square in the first row and the first column).

For the empty square R1C1 (the square in the first row and the first column), number 5 is its only choice because

• Numbers 1 and 2 show up in the first row where R1C1 is in.
• Number 3 already shows up in the first column where R1C1 is in.
• Number 4 already shows up in the first box where R1C1 is in.
• Numbers 6, 7, 8 show up in the first box where R1C1 is in.
• Number 9 shows up in the first row where R1C1 is in.

### How to find them?

Scan the boxes (or rows, columns) which has many numbers filled. When you see such a box, check every empty square in this box to see whether it has only one candidate left. If it is, you can fill this empty square with this only candidate.

##### 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?