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

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

To give you a good chance of spotting the swordfish you should enter all the pencil marks in the grid as shown here.

Have a look at the highlighted square. That 4x4 region already contains 1, 2, 4, 5, 7, 9, D, E and F. The If lines are drawn along the rows and columns, connecting the squares involved, they can form two rectangles, connected at the corners. In this case, this particular number can be eliminated as a possibility for all other squares in those two columns. x 9 grid. Place a digit from 1 to 9 in each empty cell. Every row, every column, and every 3 x 3 box should contain one of each digit. Sudoku is one of the world’s most popular puzzle games, but even though it’s a game played by millions of people all over the world, there is a big difference in skill level between the most successful Sudoku players and average Sudoku players who enjoy the game just as a casual hobby.

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. So, you can eliminate the 3 pencil mark from all other unsolved squares in these intersecting rows (Fig.If you like playing some seriously hard Sudoku, try the puzzles at the end of The Times Sudoku 6 book with some requiring the swordfish technique. Sudoku.com has some features that will help you with expert level Sudoku. An option that is especially useful at the beginning of the game is the ability to select a hint. The correction function is also very useful, since due to the high level of complexity, it is necessary to make corrections more often. For more free Sudoku every day, get the Sudoku Of The Day app for your phone or tablet, and do extra puzzles every day! More free Sudoku for you to play 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.

With many advanced techniques, the key is to spot patterns within your pencil marks to eliminate possibilities within other squares. 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 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. 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.Pencil marks are small numbers, usually written at the top of each unsolved square, listing all the possible values for that square. Solving these puzzles is a different matter entirely, since these are the most difficult puzzles we create. Difficulty depends on the type of steps required to solve them, and also on the number of each type of step. See our guide to solution rules for hard sudoku puzzles.