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

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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. In this case, this particular number can be eliminated as a possibility for all other squares in those two columns.

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

Playing sudoku evil online has a lot of advantages. While solving sudoku, your brain exercises logic, learns to make decisions, and puts your memory to the test. Regularly playing evil sudoku is a good method of improving your concentration. Play 1 or 2 evil sudoku games every day and you will not have any problems with losing focus while doing important things. Every puzzle on Samurai Sudoku has one unique solution which can be found with pure logic, no guessing required. If lines are drawn along the rows and columns, connecting the squares involved, they can form two rectangles, connected at the corners. InNovember 2006, The Times introduced a new extreme level of Sudoku giving players a moredifficult level of logic: Super Fiendish.

So, as we increase the difficulty Super Fiendish, the time has come to present the essential techniques for solving the most difficult Sudoku puzzles. 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!This is an example of a 16x16 Sudoku. They are very similar to standard 9x9 Sudoku puzzles, but instead 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). Place digits from 1to9 in each empty cell. Every row, every column, and every 3x3 box should contain one of each digit. In general, an x-wing is found when for two rows, there are two, and only two, possible squares in which a particular number can be placed, and for both rows these squares lie in the same 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.