You may ask why this last obvious answer is obvious. The first obvious answer is C1R6 (cell in column 1, row 6) = 1. Start with the 1’s to see if there are any obvious 1-choice answers. FILL IN THE OPTIONS FOR THE UNSOLVED CELLS.MARK UNSOLVED CELLS WITH OPTIONS THAT CANNOT EXIST IN THOSE CELLS.Prior to utilizing techniques first complete the 4 Steps of Puzzle Preparation … and December 2018.Īs a reminder, the basic rules of Sudoku are that the numbers 1-9 must be contained and cannot be repeated in a row, column, or box, and there can only be one solution to the puzzle. Steps 1-5 are relatively common techniques and are explained in the TI LIFE articles above. Step 7: DAN’S CLOSE RELATIONSHIP CHALLENGE Step 4: XY-Wings & XYZ Wings – December 2015 Step 3: Sudoku Gordonian Rectangles and Polygons – November 2015 Step 2: Turbos & Interaction – October 2015 Step 1: Sudoku Pairs, Triplets and Quads – September 2015 Once you have completed the puzzle, to the extent that you have filled-in all obvious answers and have written all potential options across the top of the unsolved cells (PUZZLE PREPARATION), Dan recommends the following Steps to complete the puzzle. Puzzle #48ĭAN’S 8-STEP APPROACH TO SOLVING ALL SUDOKU PUZZLES If you are a beginner or at an intermediate level, you have the opportunity to learn the skills necessary to solve extreme puzzles. If you are an expert, sharpen your pencil and enjoy. Regardless of your skill level, 2019 will be the year of the Sudoku Challenge and learning! All 12 of the puzzles for 2019 have been selected and each will represent a serious challenge. As we begin a new year, let’s pause and ask ourselves how we would evaluate our Sudoku skills.
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