Rooted: Created page with "A '''backdoor''' is a placement of one or more candidates in their respective cells, which allows the player to complete the Sudoku with relatively simple solvin..."

2020-06-05T02:18:44Z

Created page with "A '''backdoor''' is a placement of one or more candidates in their respective cells, which allows the player to complete the Sudoku with relatively simple solvin..."

New page

A '''backdoor''' is a placement of one or more [[candidate]]s in their respective [[cell]]s, which allows the player to complete the [[Sudoku]] with relatively simple [[solving technique]]s.

A popular alias for backdoor is '''magic cell'''. The backdoor digits are taken from the [[solution]].

Each backdoor has two properties:

; Size
: A magic cell is a backdoor of size 1. A backdoor of size '''N''' requires the placement of '''N''' digits.

; Technique set
: The set of solving techniques that is required to solve the remaining puzzle ''after'' the backdoor digits are placed. There are two sets most commonly used for backdoor determination:
:* [[Single]]s
:* Simple Sudoku Technique Set ([[SSTS]])

Backdoors are used to determine the difficulty of a Sudoku puzzle. The number of backdoors has an effect on the chance that a player can complete the puzzle by making a [[guess]], rather than using logic.

Backdoor - Revision history

Rooted: Created page with "A '''backdoor''' is a placement of one or more candidates in their respective cells, which allows the player to complete the Sudoku with relatively simple solvin..."