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25-9-2021, 07:03 UTC

World Sudoku Championship
The 2nd World Sudoku Championship in the Czech Republic is organized under the auspices of the president of the Czech Republic, Václav Klaus. The Sudoku Championship will be held March 28 - April 1, 2007 in Prague which has the honor of being the organizer of this supreme puzzle event for the first time.
Sudoku has proved to be a huge success with Czechs - replacing crossword puzzles as a popular pastime. The winner of the first ever World Championship in Sudoku held in Italy last year was 33-year old Jana Tylova from the Czech Republic.

Thomas Snyder and Vaclav KlausThomas Snyder and Vaclav Klaus
Photo: CTK
What is Sudoku
The puzzle was designed by Howard Garns, a retired architect and freelance puzzle constructor, and first published in 1979. Although likely inspired by the Latin square invention of Leonhard Euler, Garns added a third dimension (the regional restriction) to the mathematical construct and (unlike Euler) presented the creation as a puzzle, providing a partially-completed grid and requiring the solver to fill in the rest. The puzzle was first published in New York by the specialist puzzle publisher Dell Magazines under the title Number Place. The puzzle was introduced in Japan by Nikoli in April 1984 as Suuji wa dokushin ni kagiru. At a later date, the name was abbreviated to Sudoku; su = number, doku = single). In 1986, Nikoli introduced two innovations which guaranteed the popularity of the puzzle: the number of givens was restricted to no more than 32 and puzzles became "symmetrical" (meaning the givens were distributed in rotationally symmetric cells).
Sudoku is a logic game made up of a square divided into 81 smaller squares. These squares are grouped in nine 3x3 squares. The object of the game is to put down the numbers 1-9 so that each number appears only once in every row, column, and 3x3 square, in keeping with the numbers already placed. Although numbers are used, it is stressed that numbers are not necessary, they could just as well be colors, shapes, letters, or any other symbol.
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