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In 2000, a friend of mine from Japan sends me a strange puzzle. In a box of 9 X 9 grids, there were few numbers listed randomly.
"Fill in the grid so that every row, every column, and every 3×3 box contains the digits 1 through 9" That’s all she said.
For the next few days, I was totally stuck with the puzzle trying to solve the mystery. I was helpless without any guide or help…but I was excited. There were a few moments I feel like giving up, but I came back eventually.
She told me that the puzzle is called Sudoku. No Sudoku Tips were offer to me. I was totally overwhelmed, I was addicted.
The immense surge in popularity of Sudoku internationally has led to it being dubbed in the world media in 2005 variously as "the Rubik’s cube of the 21st century" or the "fastest growing puzzle in the world".
Playing Sudoku is like playing Golf. You play against yourself and also challenge others in the Solving time. No cheating is necessary. Your skill can only be better and better through regular playing.
Sudoku is said to have 18th – century roots and Japanese connection. The name Sudoku may sound like the hideous Sadako from the hit Japanese horror movie – The Ring. But Sudoku can be more terrifying than the female ghost who crawl out from the TV. It sucks up your brain cell and time.
In a classic Sudoku Puzzle, it consist a grid of 9 squares wide and 9 squares deep. The lines of squares running horizontally are called rows, and the lines running vertically are called columns. The grid is further divided by the darker lines into nine 3 X 3 square ‘boxes’. Some of the squares already have numbers in them. The task is to fill in the blank squares.
“Sudoku is just a game, it can be solved with plain logic and reasoning. Why need a Sudoku Guide?”…You may ask.
If you allow testing for a hypothesis as a logical step then here is a logical method which will solve any SudokuPuzzle.
Based on the calculation done by Bertram Felgenhauer in 2005, the total number of possible solution for a 9 X 9 Sudoku grids is known to be 6,670,903,752,021,072,936,960, which is roughly the number of micrometers to the nearest star.
Make a list of all these grids. You go through these grids one by one until you find one that fits your puzzle. At each stage you are hypothesising that "I found the right solution". This is completely logical and the method will always work. (Of course nobody would actually try this but it illustrates the point)
With hundreds of billion numbers combination to the grids, there is only one solution to each unique Sudoku Puzzle.
Solving Sudoku… Read more…
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