/kloc-a mathematical game that originated in Switzerland in the 0/8th century. It's a logic game with paper and pen. Players need to infer the numbers of all remaining spaces according to the known numbers on the 9×9 disk, and ensure that the numbers in each row, column and thick line palace (3*3) contain 1-9, which is not repeated.

Sudoku is nine palaces, and each palace is divided into nine squares. Give some known numbers and problem-solving conditions in this eighty-one box, and use logic and reasoning to fill in the numbers of 1-9 in other blanks. Make each number of 1-9 appear only once in each row, column and palace, so it is also called "Jiugongge".

Sudoku event:

The World Sudoku Championship is the highest international Sudoku competition organized by the World Puzzle Federation. It is held once a year and is applied by different member countries in turn. The first session was held in Lucca, Italy in 2006, and the eighth session was held in Beijing on 20 13. The only authorized organization of Shi Zhilian in each country selects the national team to participate in the competition every year.

Beijing International Sudoku Grand Prix is an international Sudoku competition sponsored by Beijing Radio and Television Station. The high prize money of the competition also attracted many international experts to participate actively, providing a platform for domestic experts to compete with foreign experts. The first session was held in 20 1 1, and the second session was held in May of 20 12. At present, domestic contestants have been among the best in Sudoku national team or in domestic trials.