What is the anti queen rule in Sudoku?

Rules: All standard sudoku rules apply. Additionally 7 out of the 9 digits follow an anti-queen constraint, meaning that two of the same digit cannot be a queen's move apart if they are one of those 7 digits. The remaining 2 digits follow an anti-king constraint, meaning they cannot be a king's move apart.

What are the anti king Sudoku rules?

Anti-king rules: no two squares that touch either horizontally, vertically or diagonally can have the same digit. (As in, no two squares a chess king can move between in a single move.) 3. Non-consecutive rules: no two squares that are horizontally or vertically adjacent can have consecutive numbers.

How do you play Queen Sudoku?

Place numbers in the grid such that every row, column and 3x3 box contain the numbers 1 to 9. One number (usually '9') in the grid is a chess Queen. Two Queens cannot be placed along the same row, column or diagonal of any length.

What are the purple lines in Sudoku?

Digits on a purple line form a set of consecutive, non-repeating digits in any order.

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).

Normal Sudoku Rules CANNOT Apply

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.

How do you play Sudoku without guessing?

There are more than a few techniques to solve a Sudoku puzzle, but per Conceptis Puzzles, the easiest way to a Sudoku solution 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.”

What is the Sudoku ring rule?

The Phistomefel Ring (also referred to as Phistomefel's Ring and Phistomefel's Theorem in some cases) is a form of Set Equivalence Theory that states the 2x2 corner blocks of any Regular 9x9 Sudoku Grid contain exactly the same digits as the cells that border the edge of box 5 (including the corners).

How do you play Sudoku evil?

The principle of the solution is the same as in the classic Sudoku. The goal is to fill the grid, so that each row, column, and 3x3 block contain all the digits from 1 to 9 without repeating. But in Evil Sudoku, there are much fewer numbers on the grid at the beginning. There's going to be only 4 or even fewer numbers.

What is the last possible number rule in Sudoku?

Last possible number is a simple strategy that is suitable for beginners. It is based on finding the missing number. To find the missing number you should take a look at the numbers that are already exist in the 3x3 block you are interested in, and in the rows and columns connected with it.

What is Sudoku 4 cell rule?

Rules of Quadruple Sudoku

The object of the puzzle is to fill in the whole 9x9 grid with numbers 1 through 9 (one number per cell) so that each row, each column, and each of the nine 3x3 boxes contains all the nine different numbers 1 through 9. The clues are in the form of sets of four special clue-numbers.

What is diabolical Sudoku?

Classic sudoku: fit the numbers in the grid so that each row, column and square contains the numbers one to nine once only. If you think it sounds simple then try our diabolical sudoku to see how hard it can be. All Sudoku Diabolical Puzzles.

Is Sudoku good for brain?

In short, while Sudoku isn't a miracle cure, it is a fun and relaxing game that can help you keep your brain active and pass the time. While the jury is still out on whether it will make you smarter, it will definitely keep you on your toes! It's also a fun and engaging hobby.

Can evil Sudoku be solved without guessing?

Sudoku does not require guessing. In fact, when solving Sudoku puzzles, you're better off NOT guessing at all. Sudoku is a logic puzzle, using the power of simple deductive reasoning and process of elimination to fill in the gaps in the grid. Simply put – you don't need luck to play Sudoku.

What is the rule of two in Sudoku?

The game of Sudoku consists of a grid of nine rows and nine columns subdivided into nine 3x3 subgrids. It has two basic rules: Each column, each row, and each box (3x3 subgrid) must have the numbers 1 to 9. No column, row or box can have two squares with the same number.

Is there only one correct answer in Sudoku?

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. The solver's jobs is to fill in the remaining cells so that each row, column and 3×3 box in the grid contains all nine digits. There's another unwritten rule: the puzzle must have only one solution.

What is the swordfish technique 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 hidden pair in Sudoku?

A hidden pair occurs when a pair of numbers appears in exactly two squares in a row, column, or block, but those two numbers aren't the only ones in their squares. In the above example, the 5 and 9 in red are a hidden pair.

What is the least numbers needed to solve a Sudoku?

The fewest clues required for a proper Sudoku is 17, but not all completed grids can be reduced to a proper 17 clue Sudoku. About 49,000 unique (non-equivalent) Sudokus with 17 clues have been found. (A proper Sudoku has only one solution).

What is a ghost number in Sudoku?

Ghost numbers are empty cells in a row, column or box that are the only cells that can hold a specific digit. Ghost numbers can be used to narrow down the possible places in other rows, columns or boxes where the same digit can exist.

What does a dot mean in Sudoku?

The dot notation uses a pattern of dots in each square, where the dot position indicates a number from 1 to 9. The dot notation can be used on the original puzzle.

Can the same number be in the same spot in Sudoku?

Sudoku puzzles cannot have the same number twice in any row, column or box (container). You can take advantage of this by using deduction to determine (1) which numbers are missing, and (2) where the missing numbers go.

Do Sudoku players have high IQ?

From this case study it can be concluded that an individual who is skilled at solving Sudoku puzzles likely has a high general IQ. The results of the weak correlation between Sudoku scores and the WAIT test indicates that in some cases a high Sudoku doesn't necessarily mean a high general IQ.

What is the average time to solve a Sudoku?

It can be incredibly challenging to solve a Sudoku puzzle. That's what makes it fun. 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.