![]() ![]() ![]() So, we will pause here and enter options 89 in those two cells per Example #52.1 below: Example #52.1 In box 9 (Lower right-hand box of 9 x 9 cells) we see that options 8 & 9 can exist only in C8R7 (cell in column 8, row 7) and C8R9. FILL IN THE OPTIONS FOR THE UNSOLVED CELLSīefore we begin let’s see if there are any observations regarding the given answers that might positively affect us later in the puzzle. ![]() MARK UNSOLVED CELLS WITH OPTIONS THAT CANNOT EXIST IN THOSE CELLS.Prior to utilizing techniques first complete the 4 Steps of Puzzle Preparation … May 2018, June 2018, July 2018, August 2018, September 2018, October 2018, November 2018, December 2018, January 2019, February 2019, March 2019 and April 2019.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. May is bonus month! Following Puzzle #52 below is a bonus puzzle #53 for you to solve.ĭAN’S 8-STEP APPROACH TO SOLVING ALL SUDOKU PUZZLES ![]()
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