![]() ![]() Now your grid should look like Example #45.4 below: Therefore, all other options for those two cells can be eliminated. ![]() In any event, C3R1 & C7R1 are the only two cells in row 1 that contain the options 6 & 7. Personally, I spotted the quint before the hidden pair. Can you spot any Step 1 clues in Example #45.3 above? We will begin with Step 1, identifying Pairs, Triplets, Quads & Quints. Once you fill in the options for the unsolved cells, your grid should look like Example #45.3 below: Now your grid should look like Example #45.2 below:įILL IN THE OPTIONS FOR THE UNSOLVED CELLS … In box 9 a 5 can only exist in C7R8 or C7R9 therefore, a 5 cannot exist in C7R4 or C7R6. We will not put a “5” in the bottom of C4R5 or C8R5 because the 5 in C4R2 & C8R1 precludes C4R5 & C8R1 from being a 5. In box 4 a 5 can only exist in C2R5 or C3R5 therefore, a 5 cannot exist in C4R5, C6R5, C8R5 or C9R5. In box 4 a 4 can only exist in C1R4 of C1R6 therefore, a 4 cannot exist in C1R2, C1R3, C1R8 or C1R9. Pencil a small 2 in the bottom of those 4 cells to indicate they cannot be a 2. In box 2 (top, middle grid of 3 x 3 cells) a 2 can exist only in C4R1 or C6R1 therefore, a 2 cannot exist as an option in C2R1, C3R1, C7R1 or C9R1. MARK UNSOLVED CELLS WITH OPTIONS THAT CANNOT EXIST IN THOSE CELLS … Now your grid should look like Example #45.1 below: The first obvious answer is C6R3=9 (cell in column 6, row 3). 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 … May 2018, June 2018, July 2018, August 2018 and September 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. Experience the power of the 6 with puzzle #45!ĭAN’S 8-STEP APPROACH TO SOLVING ALL SUDOKU PUZZLES ![]()
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