The Times Fiendish Su Doku Book 1: 200 challenging Su Doku puzzles (The Times Fiendish Su Doku Puzzle Books)

Product Information

InNovember 2006, The Times introduced a new extreme level of Sudoku giving players a moredifficult level of logic: Super Fiendish. So, you can eliminate the 3 pencil mark from all other unsolved squares in these intersecting rows (Fig. Using the same logic in the last column, you can also eliminate the 7 as a possibility from all squares which are not in either highlighted row (Fig. 2).

submissions and try for the Experts list. Anyone can get into the Top Sudoku Expert list - this is now the sum of all your correct entries for theSudoku evil is a 9×9 grid sudoku puzzle with the highest possible level of difficulty. It’s an advanced level only for experienced sudoku solvers. Simple logic and basic knowledge of sudoku rules won’t cut it – you as a player should know advanced sudoku solving techniques and understand how to apply them in practice. In Fig. 4, the relevant pencil marks are entered to show that you have two possible squares in which the 3 can be placed in the third and fourth columns, and three possible squares in the seventh column (highlighted). Therefore, on each of the three intersecting rows, the 3 must be placed in one of the highlighted columns. The basic rules of Sudoku are easy. Just place the digits from 1 to 9 in each empty cell. Each row, column, and 3 x 3 box must contain only one of each of the 9 digits. If lines are drawn along the rows and columns, connecting the squares involved, they can form two rectangles, connected at the corners.

A swordfish is found when for three rows, there are two or three possible squares in which a particular number can be placed, and for all three rows these squares lie in the same three columns. To give you a good chance of spotting the swordfish you should enter all the pencil marks in the grid as shown here.XY-Wing strategy is an advanced technique for eliminating candidates. Let’s review it with an example. Let’s say, there are 3 different cells with exactly 2 candidates (notes) each that are related to each other. The cell in the center is called the pivot. The two others are called the pincers. Each of these cells can include only one of 3 digits, named X, Y, Z. It means that any 3 digits can replace these letters. If you really like Super Fiendish, you will have to wait a little longer for The Times Sudoku 7 with 25 extremely hard Sudoku, many requiring x-wing or swordfish to complete.