What is a swordfish in Sudoku?

A Swordfish is a 3 by 3 nine-cell pattern where a candidate is found on three different rows (or three columns) and they line up in the opposite direction. Eventually we will fix three candidates somewhere in those cells which excludes all other candidates in those units.

What is a jellyfish in Sudoku?

A Jellyfish occurs when in four rows all possible cells for a given digit lie in four columns. This digit can be eliminated from the remaining cells of these columns. The technique also works when we replace rows with columns.

What are wings in Sudoku?

X-Wings are when there are two lines, each having the same two positions for a number. Take a look at this puzzle: Once you've satisfied yourself that there aren't any easy methods you can apply to move forward, take a look at the candidate positions for 6, in rows 4 and 9.

What are the 3 rules of Sudoku?

Is Sudoku good for the brain?

Sudoku keeps your brain active and reduces the risk of Alzheimer's, a most common cause of dementia that affects a person's thinking and behavioural skills. Stimulates your mind: The game works on your logical thinking process as you are absorbed in solving a puzzle and eventually improve your number skills.

Swordfish - an Advanced Sudoku technique

What is the trick to solving Sudoku puzzles?

What do the GREY squares in Sudoku mean?

Odd. Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions. The grey squares must contain odd digits. Sudoku. Solution.

What is the Sudoku Magic Square?

The markings on the back of the turtle were in fact a magic square. A magic square is a square grid filled with numbers, in such a way that each row, each column, and the two diagonals add up to the same number.

What is the dead end in Sudoku?

There is no solution. Out in the Sudoku verse, the other name for it is the bivalue universal grave or graveyard. And basically what that means bivalue means two possibilities in each space. And then universal that it's every space on the board, and then graveyard means that it's basically a dead end.

What is the hardest Sudoku game?

Expert Sudoku is a game for experienced Sudoku players with a very high level of difficulty. This hardest Sudoku puzzle is characterized by the fact that only a few numbers are shown in the Sudoku square, which consists of 9 small squares, where the cells are located 3x3.

What is the least clues in Sudoku?

Sudoku fanatics have long claimed that the smallest number of starting clues a puzzle can contain is 17. Now a year-long calculation proves there are no 16-clue puzzles. Sudoku is a number puzzle consisting of a 9 x 9 grid in which some cells contain clues in the form of digits from 1 to 9.

What is the average Sudoku time?

It is believed that the average Sudoku player spends approximately 20 minutes solving a typical Sudoku puzzle. For very hard puzzles, that number can be much higher. While the game itself can be challenging and complex, several strategies can be used successfully to find the solution.

What does Sudoku say about you?

Focus, Focus, Focus

Some of the best Sudoku players seem to be exceptionally good at “switching off their minds” to the outside world and being able to focus for hours on solving Sudoku puzzles. Sudoku is a game that requires concentration.

What are the 2 rules of Miracle Sudoku?

The puzzle is called the Miracle Sudoku and it's made by fellow puzzle legend Mitchell Lee. And here are the special rules: “Any two cells separated by a knight's move or a king's move (in chess) cannot contain the same digit. Any two orthogonally adjacent cells cannot contain consecutive digits.”

Can you put the numbers 1 to 8 in each of the squares?

Expert-Verified Answer

Can you put the numbers 1 to 8 in each of the squares so that each sides add up to the middle number 13. Solution: From a given statement we got to know that, we need to arrange the numbers from 1 to 8 such that each side of a square adds up to 13. Hence the required arrangement.

Do the numbers in Sudoku have to add up?

All solved Sudoku puzzles, where "solved" is defined as a 9x9 grid having the set 1-9 in each column, row, and 3x3 quadrant, can be verified as solved by taking the sum of each row, column, and quadrant, as the sum will always be 1215.

What is the one rule in Sudoku?

Sudoku Rule № 1: Use Numbers 1-9

Within the rows and columns are 9 “squares” (made up of 3 x 3 spaces). Each row, column and square (9 spaces each) needs to be filled out with the numbers 1-9, without repeating any numbers within the row, column or square.

What does R and C mean in Sudoku?

A single cell is called out by specifying its row and column numbers with an 'r' preceding the row number and a 'c' preceding the column number. Examples: r1c9 means the cell in row one and column nine (the rightmost cell on the top row). r8c3 is the cell on row eight, third cell from the left.

Why do the numbers turn red in Sudoku?

We can see a 4 in the upper left square (circled in red) so that means the blank space in the center of the top square must be number 3, and the lower right space must be number 4 (both marked in blue). Suddenly, we've solved a whole column and another whole square at the top center of the grid, as shown below.

What is the 45 rule in Sudoku?

The 45 rule is a basic solving-technique in Killer Sudoku. Each house (row, column, nonet) must add to 45 (the sum of the digits 1 through 9).

Can there be 2 solutions to a Sudoku puzzle?

A well-formed Sudoku puzzle is one that has a unique solution. A Sudoku puzzle can have more than one solution, but in this case the kind of logical reasoning we described while discussing solving strategies may fall short.

What is the best order to solve Sudoku?

The easiest way starting a Sudoku puzzle is to scan rows and columns within each triple-box area, eliminating numbers or squares and finding situations where only a single number can fit into a single square. The scanning technique is fast and usually sufficient to solve easy puzzles all the way to the end.