How to do Sudoku, how to do Sudoku

One-way sweep view: In the first example, let's take a look at house 2.

We know that the number 9 must be contained in each house, the number 9 in the 1st house as well as in the 3rd house, and the 9 in the 1st house is in the 3rd row.

The 9 in the 3rd house is on the 2nd line, which means that the 9 in the 2nd house cannot be in the 2nd and 3rd rows, and all the 9s in the 2nd house can only be placed in the space in the first row of the 2nd house.

2.Bi-directional sweep view: The same technique can be extended to rows and columns that are perpendicular to each other.

Let's think about how 1 in the 3rd house should be placed in **. In this example, there are already 1s in rows 1 and 2, so only the bottom two spaces in house 3 can be filled with 1s. However, square g4 already has 1s, and all columns g cannot have any more 1s.

Therefore, i3 is the only place in the house that is eligible to fill in the number 1.

Let's take a look at the b4 square in the example below. The numbers 3, 4, 7, 8, 1 and 6 are already in the same row, 5 and 9 are in the same column, excluding all the above numbers, B4 can only fill in 2.

4 Numeric Elimination Method: The Elimination Method is a relatively complicated way to find numbers. We can indirectly deduce from the 1 in c8 that e7 and e9 must contain the number 1, no matter which square this 1 is in, we can confirm that the number 1 in column e must be in house 8, so the number 1 in the middle column of house 2 cannot exist.

Therefore, the number one in house 2 must be filled in on d2.

This course introduces the intermediate solution to Sudoku and deepens your understanding through examples.

1. There are two ways to play Sudoku, that is, the intuitive method and the intuitive method candidate number method

1. Intuitive method: without making any marks, directly observing clues from Sudoku's disk potential, and deducing the answer.

2. Candidate number method: delete the numbers that have appeared in the allele group box, and fill in the blanks with the remaining fillable numbers as a reference for solving clues, and the fillable numbers are called candidates, or candidate numbers.

3. The intuitive method and the candidate number method are only the difference between whether there is a note when filling in, according to personal habits, and is not the standard for identifying the difficulty of the question or the difficulty of the technique.

2. Sudoku is basically composed of three consecutive houses.

Columns, which are divided into large rows and large columns.

First Row: Consists of the first, second, and third houses.

Second major line: by the fourth house.

The fifth and sixth houses are composed.

Third major line: consists of the seventh, eighth, and ninth houses.

The first column: consists of the first, fourth, and seventh houses.

Second column: consists of the second, fifth, and eighth houses.

Third column: consists of the third, sixth, and ninth houses.

3. Basic solution of Sudoku:

1. Elimination method: use numbers to find the only fillable blank in the unit, which is called the elimination method, and the only space that can be filled in by numbers is called hidden single

1) The number can be filled in the only blank in the palace unit is called hidden single in box, also known as the palace exclusion method.

2) Numbers can be filled in unique blanks in the row unit called hidden single in row, also known as row elimination.

3) Numbers can be filled in with unique blanks in the column unit called the column elimination method (hidden single in column), also known as the column exclusion method of the year.

2. Unique remainder method: Use the grid to find the only fillable number, which is called the remainder method, and the only fillable number in the grid is called the only remainder solution.

Second, the law is that only one solution is needed to produce the number through the basic solution, the elimination method or the only residual method, beyond this range and the advanced solution needs to be applied, the solution point needs the advanced solution to assist the basic solution to meet the implicit uniqueness or explicit uniqueness to produce the number, and the solution of the solution point needs to be completed by multiple steps, so it is called the combined solution.

3. In addition, in 2006 Gary McGuire wrote a program in an attempt to pass the law of violence.

To prove the existence of a Sudoku with 16 hints, the method is very simple, since Berram Felgenhauer and Frazer Jarvis have calculated the total number of unequal finalists to be 5,472,730,538, then run every case where the finale is 16 hints, and if no Sudoku with 16 hints is found, then it can be proved that the minimum number of hints is 17.

This course introduces the intermediate solution to Sudoku and deepens your understanding through examples.

Both vertical and horizontal have 1 9s, and each number appears only once in this row.

Sudoku, the most basic rule is to find a way to make each row, each column, and each 3*3 have 1-9, and do not repeat each other. Here's an example.

The number five in the middle of the leftmost three times three in the figure means that the two spaces on the right side of the middle can not be five, in the same way the middle three times three, the two spaces around the number one can not be five, and the bottom three spaces of the middle 3*3 must have one of the three spaces in the bottom row of five, no matter where the five is placed, the three times three on the far right side of the middle are equivalent, that is, the two spaces on the right side of the two cannot be five.

To sum up, the two spaces around the middle three times three miles 8 cannot be five, and the two spaces to the right of 2 cannot be five, so five can only be placed in the grid on the right side of 9.

A little around, you understand?

Summary. Hello! Sudoku solutions are all derived from rules.

The basic solution method is divided into two types of ideas, one is the elimination method and the other is the unique method. More complex solutions will eventually fall into these two categories. The following is a brief introduction to several solutions with an illustration, as long as you take a few minutes to look at it, you can start doing Sudoku immediately.

The main skills of Sudoku intuitive method are: unique solution, basic elimination, block elimination, remainder solution, rectangular elimination, unit elimination, remainder test, etc.

You're good luck! Sudoku solutions are all derived from rules. The basic solution method is divided into two types of ideas, one is the elimination method and the other is the unique method.

More complex solutions will eventually fall into these two categories. The following is a brief introduction to several solutions with the diagram of the tomb, as long as you take a few minutes to look at it, you can start doing Sudoku immediately. Sudoku intuitive problem-solving skills are mainly early:

Unique solution, basic elimination, block elimination, remainder-only solution, rectangular elimination, element elimination, remainder test, etc.

Can you come up with an idea for solving the problem?

Can you come up with an idea for solving the problem?

Can you come up with an idea for solving the problem?

Hello! From easy to difficult, first do the relatively simple ones with less rubber lattices and then make the ones with more remaining lattices. , first find the rows and columns that have fewer words to fill in Sun Yuan, and then gradually exclude.

Sudoku is a logical reasoning game, and to complete a Sudoku, you need to fill in the blank boxes according to the numbers and rules you already have. Here's a simple guide to how to play Sudoku:

1.The Sudoku board consists of a 9x9 square divided into 9 small 3x3 squares. Blank boxes need to be filled with numbers from 1 to 9.

2.Rule 1: Numbers in each row, column and 3x3 square cannot be repeated.

3.At the beginning of the fight, some known numbers will be given on the Sudoku board. This already known data will help you reason and populate it with other data.

4.You need to use logical reasoning to fill in the blank grids based on existing numbers and rules. Try to determine the number that should be filled in each blank box by looking at the number balance words that already exist in each row, column, and square.

5.There are some basic strategies that can be used to solve Sudoku, such as unique candidates, remainders, block demarcation, and so on. For some more complex cases, it is necessary to use higher-level analysis and reasoning methods.

6.Fill in the blanks gradually, using logical reasoning and trial and error, until each space is filled with the correct number.

Sudoku is a challenging and fun game, as long as you keep practicing and improving your logical thinking, you can become a Sudoku master. In addition, there are now many mobile apps and web versions of Sudoku that can help you practice and solve Sudoku puzzles.