![]() Grab a pencil, and print the Medium Sudoku Sample (page 2) of the Sudoku Puzzle Samples document so you can follow along and fill in the puzzle as we go. The solution looks like this: sudokudf.iloc 0,1 Before we explain how to solve the puzzle, we should implement the three Sudoku conditions to verify that any proposed solution is in fact a solution. Examples: Saying that a 4 goes in "Q5-7" means a 4 is entered in the 7th Square in Quadrant 5 "R8" means Row 8 and "C2" means Column 2.īelow is the sample puzzle we will be solving. sudokudf shape (sudokudf) sudokudf.iloc 0,0 The zeroes represent the empty cells that we need to fill. So in this guide I will just use the Q (Quadrant), R (Row), or C (Column) abbreviations and numbers to show where numbers go. These Sudoku instruction will not be as in-depth as the Easy Instructions, because you will use the same techniques of "Checking for 1 through 9" and "Checking for one missing number in each Row, Column, and Quadrant" as in the Easy Instructions. ![]() When you are ready to put your Sudoku skills to the test, print out some of the 100 free Sudoku puzzles on this site or play Sudoku free online. If you are a Sudoku beginner, please work through his Part 1 guide first, then return to this page and learn these more complex techniques. Ghosting, RC Counting, Tagging, and Line Checking are sometimes useful when solving Easy Sudoku puzzles, but you always need these tricks to solve Medium and Hard Sudoku puzzles. Part 3 shows more advanced use of these methods. He explains these methods while using them to solve a Medium Sudoku puzzle, and you can follow along. Now, in this next guide, Kevin introduces three powerful Sudoku tricks: "Ghosting", "RC Counting", "Tagging", and "Line Checking". Those techniques are 1) "Check Each Number 1 Through 9" and 2) "Check for One Missing Number in Each Row, Column, and Quadrant." Youd see them as two pairs, if one of them wasnt hidden by sneaking in an extra 2. Look in this highlighted area: See that there are actually only two places where 1 and 3 can exist. In Part 1, Kevin explained two basic techniques you need to use when solving all Sudoku puzzles. Hidden pairs and triples are quite a bit trickier to spot they’re hiding after all This technique is also known as Hidden Subset or Unique Subset, in general.
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