Latest Changes and Additions

A quick list of the latest updates and additions to this site:

What's New
Date Created: Monday 17-Aug-2009
Last Updated: Monday 20-Jan-2025


Cage Unit Overlap
Date Created: Tuesday 22-Mar-2011
Last Updated: Tuesday 7-Jan-2025
Killer Sudoku Strategy. Cage Unit Overlap looks at the intersection of a cage with a row, column or box to find eliminations.

Unique Rectangles
Date Created: Friday 11-Apr-2008
Last Updated: Sunday 5-Jan-2025
Sudoku Strategy. Unique Rectangles takes advantage of the fact that published Sudokus have only one solution. There are many formations and strategies based on this notion and they are explained here.

Alternating Inference Chains
Date Created: Saturday 12-Apr-2008
Last Updated: Sunday 5-Jan-2025
Sudoku Strategy.Alternating Inference Chains are explained. This is the fundamental chaining strategy used to find eliminations on cells that can see the start and end of a chain.

Hidden Unique Rectangles
Date Created: Wednesday 23-Apr-2008
Last Updated: Sunday 5-Jan-2025
Sudoku Strategy. Hidden Unique Rectangles extends Unique Rectangles that take advantage of the fact that published Sudokus have only one solution. Formations and strategies based on this notion and are explained here.

KenKen Parity Strategy
Date Created: Wednesday 1-Jan-2025
Last Updated: Thursday 2-Jan-2025
KenKen 6x6 strategy that uses ODD/EVEN parities to determine eliminations

Jigsaw Sudoku Player
Date Created: Wednesday 20-Nov-2024
Last Updated: Wednesday 20-Nov-2024

Killer and KenKen String Definitions 2.0
Date Created: Thursday 9-May-2024
Last Updated: Wednesday 20-Nov-2024
A string definition encapsulating the clues, cages and progress of a Killer Sudoku puzzle with all the candidates.

Sudoku String Definitions 2.0
Date Created: Wednesday 18-Jan-2023
Last Updated: Wednesday 20-Nov-2024
A method of encapsulating the clues, solved cells and candidates of a Sudoku puzzle in a single string

Test Strings
Date Created: Wednesday 20-Nov-2024
Last Updated: Wednesday 20-Nov-2024