Braingle Games Card Games
Personal Links
Puzzle
Strategy
Entertaining

Sudoku Locked Candidates Method

*Return to the Sudoku Home

The "Locked Candidates" method is a more advanced method that can be used when the Single Solution and Single Cell methods cannot solve the puzzle on their own. This may be required for medium difficulty puzzles. This method is also known as the Single Box or Block-Block method.

Number Place Example

In the first example on the left, look at the center sub-square. Notice how the number 2 can only appear in the top row. Since it must appear in the top row of the center sub-square, we know that it cannot appear in the top row of the adjacent sub-square. Thus we can eliminate the number 2 as a possibility from the cells marked with yellow.


Number Place Example

In the second example, look at the fourth row. Notice how the number 2 must occur in the top row of the middle right sub-square. Since it must occur in one of these two spots, we can eliminate 2 as a possibility in the cells marked with yellow.




   


Online Now
11 users and 541 guests

Users In Chat
autumn
Follow Braingle!
Fold 'N Fly Paper Airplanes
Easy to follow folding instructions and videos.
Copyright © 1999-2017 | FAQ | Widgets | Links | Green | Subscribe | Contact | Privacy | Conditions | Advertise | Braingle Time: 10:43 pm
Sign In Create a free account