18 Sudoku Quad Pairs

Welcome to this Sudoku Video Turorial on Sudoku Quad Pairs.  It is part of a series of Sudoku Tutorials that I am basing closely on the Sudoku Analyses Techniques which can be found on the LittleGogs website Analyses Section
http://www.littlegogs.com/analyses/nl...

Duncans Quad Pairs aka Unique Rectangles
Quad Pair: Four Houses each containing a Pair arranged in a rectangle so that they share two Rows , two Columns and two Boxes.  It is only true if they share 2 Houses as in the example.  If they shared 4 Houses, the logic falls down.
http://www.littlegogs.com/analyses/qu...

I use Duncans Sudoku Solver extensively and here is a link to download it
http://www.littlegogs.com/download/nl...
Cracking The Cryptic Website – I’m using as a source of Soduku Examples
crackingthecryptic
Im also using SudokuOfTheDay as a source of some examples in some tutorials
https://www.sudokuoftheday.com/dailyp...

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