## Thursday, January 26, 2017

Anti Knight Sudoku puzzle is Classic Sudoku look alike puzzle. In this Sudoku Classic Sudoku rules are applied along with one added chess rule that no two identical number can be chess knight's move away from each other. Anti Knight Sudoku is also known with the name No Knight Step Sudoku as same numbers on the cells which are Knight Step away from each other are not allowed.
There are many techniques to solve Anti Knight Sudoku. It will take a separate post to list all the techniques to solve this Anti Knight Sudoku puzzle. However currently below I am mentioning few techniques to solve this Sudoku type.
•  L shape technique: When there only three cell possibility remaining for a particular number (say A) which forms L shape then extend this L backward two steps back in both the direction forming + with original L shape. These two cells cannot have number A.
•  Corners Box Technique: For any box the central number in the next box touching the edge in the original box can lie only on the corners of the original box.
•  Edge touching numbers: If in a box there is only two possibilities of  a number (say B) which lies on the edge of the box and these two possibilities are one cell apart then  number B cannot be in the immediately next cell in the touching box.
There are few Anti Knight Sudoku puzzles and few Sudoku variations which are based on Anti Knight Sudoku puzzle are there on this website. On this page list of these puzzles links is given.

Rules of Anti Knight Sudoku Puzzle
Place a digit from 1 to 9 into each of the empty cells so that each digit appears exactly once in each row, column and 3x3 outlined box. Additionally no two identical digits can be a chess knight‘s move away from each other (as shown in the diagram).

### Anti Knight Sudoku (Daily Sudoku League #40)

Following is the link of the Anti Knight Sudoku Variations. Rules of these puzzles are explained in the corresponding page.

### Anti Knight XV Sudoku (Daily Sudoku League #106)

Checkout more Sudoku Variations by clicking on the below image
 Sudoku Variations Main Page