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

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Look along each of the rows in turn, noting each one that contains only two or three squares with the current number as a possibility.

So, as we increase the difficulty Super Fiendish, the time has come to present the essential techniques for solving the most difficult Sudoku puzzles. 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 the First a couple of preliminary points: if you have ever completed any Fiendish or Super Fiendish Sudoku, you will be familiar with noting down candidates or pencil marks. While it's totally fine to play sudoku intuitively on the easy levels, evil sudoku requires the knowledge of some strategies. Here is the most popular one for solving sudoku on the evil level.If lines are drawn along the rows and columns, connecting the squares involved, they can form two rectangles, connected at the corners. So, there are two possible ways of placing the 7; how does this help you solve anything? Well, you have established that the 7 for the first column must be in one of the two highlighted rows; not in any other squares in this column. Extreme Sudoku posts five new puzzles every day. Each puzzle has a unique solution and can be solved with pure logic. Lots of it. Guessing is never required - but it may help! Fig. 3 is a partially solved Sudoku, using easy and medium difficulty solving techniques; no more squares can be solved using them. Even though evil sudoku is an extremely difficult game level, many experienced players find it the best way for brain training and developing mental skills. How to solve Sudoku Evil?

Sudoku 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 this case, this particular number can be eliminated as a possibility for all other squares in those three columns. 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. With many advanced techniques, the key is to spot patterns within your pencil marks to eliminate possibilities within other squares. The swordfish technique isnamed aftera World War II biplane called the “Fairey Swordfish”, a Torpedo Spotter Reconnaissance biplane used by the Royal Navy from 1936 to 1945.In this case, this particular number can be eliminated as a possibility for all other squares in those two columns. To give you a good chance of spotting the swordfish you should enter all the pencil marks in the grid as shown here. Essentially, this method uses the fact that in certain cases, there are only two possible ways of placing two numbers in four squares which form a rectangle. 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).

Here we present the techniques that will help you solve the hardest puzzles using only logic and no guesswork.

The History of Mahjong

The pivot contains candidates XY. The pincers - candidates XZ and YZ. Any cell that intersects both pincers can’t longer contain a candidate for digit Z, because the pivot means either of the pincers to contain this digit. Why play Evil Sudoku? InNovember 2006, The Times introduced a new extreme level of Sudoku giving players a moredifficult level of logic: Super Fiendish. 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).