Everyone knows about Sudoku games as intelectual games that aid us to exercise our brain, train our intelligence and relax. The rule of the games is actually basic: you must fill the numbers from 1 to 9 into the blank cells so that they are not repeated in each vertical colomn, each row and each small partition.

 

It is a puzzle square, each side has 9 small squares combined to 9 columns, 9 rows and is divided into 9 large 3×3 boxes. You will discover some cells which are filled the numbers and they are the clues for your next work. There are actually three levels of the games. They are Easy, Medium and Hard which determined by the number of clues in the puzzles

 

When you play the games several times, you will find many ways to fill the numbers into the cell but if this is the first time you play it, scanning is a fine idea for you. Scanning is to probe horizontally and vertically to exclude the cells that cannot be entered the number on the principle not to be repeated. It usually means that if horizontal or vertical row has a number, so the other cells on that horizontal or vertical row will not be able to fill it again.

 

You had better start with the number 1 and when you cannot correctly identify it, turn to the number 2,3... up to 9 and them go back to number 1. Since this time there has been further some cells have been filled in, the determination of other numbers will become easier. You should remember that when any horizontal row or vertical row or the big box (3x3) has 8 numbers, fill in the last number to help you have more data to get the others

 

For mathematicians, suddenly solve a longstanding problem is always a joyful moment. 2012 began with a moment like that, when an Ireland mathematician named Gary McGuire has announced a remedy to the problem of the minimum number of clues in Sudoku game. This game in particular has 17 clues to start. It is assumed that 17 is the minimum number for any proper game . The mathematician Gordon Royle maintains an online database has nearly 50,000 puzzles with 17 clues started (in fact, the puzzle was adapted from the one of the puzzles in that list). However, even with the computer searches, people still may not find an example of one game with 16 or fewer clues. McGuire’s solution involves a collaboration of mathematics and computer science. To cut down the time needed for a full search, he performed the notion of “set of inevitability”.

 

Now we visualize a square puzzle. You may see why we need to have at least a clue started from one of the bold cell ? The reason is that if you do not do that, then we will be able to transform the digits in the box to generate a second solution for a puzzle. The truth is, specially in square Sudoku, there is a lot of sets that are similar to “set of inevitability”. A part in McGuire solution involves in finding a huge selection of some “set of inevitability” in each square Sudoku.

 

In spite of ages you are, do not miss the chance to train your brain and entertain with this kind of game. You'll find numerous sources of playing Sudoku games such as magazines, newspapers and online websites.. Not only numbers, you'll find also symbols and many other variation of Sudoku games are available on the internet. Please look into sudokugames.name to have a good time and entertainment.