1/30/2024 0 Comments 3 x 3 blank sudoku gridYour grid should now look like Example 6 below: Example 6 Next fill in the options for the remaining unsolved cells. The same applies for the 2 unsolved cells in box 9. So why did we not mention the pair in box 7 or box 9? The 2 cells with 39 as their options in box 7, do not influence the options of any other unsolved cells. Now your grid should look like Example 5 below: Example 5 So we will fill in the options for the unsolved cells in box 2, row 2, and box 8 first. The triplet in box 8 precludes the other 2 cells from being a 2, 3, or 7, and therefore they are either 5 or 9. Likewise, the 56 in C7R2 and C9R2 preclude the other cells in row 2 from containing a 5 or 6. The other 3 unsolved cells in box 2 cannot contain a 2 or 5, and therefore are limited to 3, 7, and 9. For example, the 25 in C4R1 and C4R2 affect the other cells in box 2. So why did we just pick those two pair and the triplet? We picked them because they affect other cells. Now your grid should look like Example 4 below: Example 4 C7R2 and C9R2 must be a 5 or 6, so indicate “56”. Normally we would indicate this by writing a small 5 in the bottom of C6R3, however, as you will soon see, this will be remedied in a more encompassing way.įirst fill in obvious pairs and triplets.Ĭ4R1 and C5R1 must be a 2 or 5, so we will indicate the options for these cells as “25” in the upper portion of these cells. Similarly, either C1R3 or C3R3 must be a 5, therefore C6R3 cannot be a 5. Indicate options that cannot exist in a cell: C2R9 is a 5, therefore C2R2 cannot be a 5. Now your grid should look like Example 3 below: Using the same reasoning, C2R2 cannot be a 5, 6, or 8 either. If we look at the 6’s in box 2, we see that the only remaining cell that can be a 6, is C5R3. Therefore C5R2 and C6R2 cannot be a 5, 6, or 8. Cells C7R2, C8R2, & C9R2 must be some order of the numbers 5, 6, and 8. Next, look for the not-so-obvious, 1–choice cells. Now your grid should look like Example 2 below … Example 2 If you review numbers 1 – 9 again, it does not produce any more obvious 1- choice cells. C5R4 = 8.īy solving these cells, you will have set-up some more obvious, 1-choice cells, which you will find when you go through #’s 1 - 9 again, you find: C9R3 = 1. through 9, you will find the following, obvious answers, by comparing each box to the adjacent ones: C4R8 = 1. Reading above, we will start with boxes by adding the #’s 1, 2. Example 1īegin by filling in all obvious 1-choice answers in Example 1, remembering that within a column, row, or box, there is only one cell that can contain a particular number. We will use an abbreviation for cells for example Cell C7R1 (column 7, row 1) = 3 C1R5 = 8. Use your pen for solved cells and your pencil for all unsolved cells. You may want to print Example 1, or copy it onto a blank Sudoku grid, and follow along with your pencil and pen. Let’s start with a Sudoku puzzle, Example 1 below, which is an actual puzzle that will be in my second book called “200 SUDOKU PUZZLES THAT REQUIRE DAN’S ADVANCED TECHNIQUES.” Boxes are numbered 1 - 9, reading left-to-right and top-to-bottom. A Box is a group of 9 cells, in a 3 x 3 grid.Rows are numbered 1 - 9 as you look top to bottom. A Row is a horizontal collection of 9 cells.A Column is the vertical collection of 9 cells, Columns are numbered 1 - 9 as you look left to right.The puzzle is comprised of 81 (9x9) cells. The next 5 articles will cover steps 1 – 5 in depth. This article is about Puzzle Preparation. Then use the “magical formula” for solving all puzzles: Enter all potential options across the top of the unsolved cells, using pencil.ģ. Fill in all obvious answers, in each of the 9 Boxes.Ģ. Additionally, there can be only one solution to a puzzle (this is the basis for step 3 below). Enter the numbers 1 - 9 into the cells such that these numbers do not repeat themselves in a row, column, or box. Actually you could use the letters A through I, versus 1-9. Some people think you have to be a math whiz to be good at Sudoku.
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