Rooted: Created page with "The '''Naked Single''' is categorized as a solving technique but you can hardly call it a technique. A naked single is that what remains after you have applied your..."

2020-05-31T05:09:15Z

Created page with "The '''Naked Single''' is categorized as a solving technique but you can hardly call it a technique. A naked single is that what remains <u>after</u> you have applied your..."

New page

The '''Naked Single''' is categorized as a [[solving technique]] but you can hardly call it a technique. A naked single is that what remains <u>after</u> you have applied your solving techniques, by eliminating other candidates.

A naked single is the last remaining [[candidate]] in a [[cell]]. Alternative terms are '''Forced Digit''' and '''Sole Candidate'''.

The easiest way to find naked singles in the [[grid]] is using [[pencilmark]]s. Cells with a single pencilmark are easy to spot. Without pencilmarks, you need to inspect the [[peer]]s of the cell and see if there is only a single digit missing in the peers. You need a good short-term memory to do it this way, but many players prefer to solve easy Sudokus without pencilmarks.

Most players do not mention the discovery of [[single]]s to other players. When a [[Sudoku]] can be solved with singles only, the entire puzzle is not worth a discussion.

== Example ==

The following Sudoku has two Naked Singles for [[digit]] '''8'''.

[[Image:naked single.png]]

The following six puzzles can be solved by only placing naked singles when using [[pencilmark]]s.

..........1.2.3.4....456....47...89...2.7.6...98...75....684....3.7.1.6..........
..4...9...37...54.19.....38...1.3......589......2.4...46.....89.12...36...5...7..
1.2...3.......4.5.5.6.2...7...1...4...5...8...3...6...7...9.1.8.8.3.......4...9.6
......1......2..34..3.5.67..1...2..8..4.6.5..3..1...2..95.4.8..68..1......2......
......9......2..36..8.9.47..7...2..1..4.6.7..6..3...2..92.4.8..38..1......7......
..9.8.7...6...5.4.3.....5.2.......3.6...7.4...8.......2.7.1...3.4.7...9...5...8..

== See also ==

* [[Hidden Single]]

== External links ==

* [http://www.sudocue.net/guide.php#NakedSingle Naked Single] by ''[[User:Ruud|Ruud van der Werf]]''
* [http://homepages.cwi.nl/~aeb/games/sudoku/solving4.html Forced Cell] by ''Andries E. Brouwer''
* [http://www.angusj.com/sudoku/hints.php Single] by ''Angus Johnson''
* [http://www.brainbashers.com/sudokuforcedmoves.asp Forced Move] by ''Kevin Stone''
* [http://www.sadmansoftware.com/sudoku/technique1.htm Naked Single] by ''Simon Armstrong''
* [http://www.paulspages.co.uk/sudoku/howtosolve/#Stage2 Single-Candidate Square] by ''Paul Stephens''
* [http://www.playr.co.uk/sudoku/solving.single.php Single Number] by ''Gaby Vanhegan''
* [http://sudoku.awardspace.biz/solving_sudoku_basic.php?strategy=single%20candidate Single Candidate (Lone Number)] by ''Vincent Tandart''
* [http://freewebs.com/experiencesudoku ExperienceSudoku] by ''Christopher Rucinski''

[[category:Solving Techniques]]

Naked Single - Revision history

Rooted: Created page with "The '''Naked Single''' is categorized as a solving technique but you can hardly call it a technique. A naked single is that what remains after you have applied your..."