I followed some advice which said that u should first look at the most common default number and do that one first. Then take it in turns to fill each row, column and box with each of the numbers.
The problem is that there is usually more than one space in the little nine-box box in which the number can theoretically go without a contravention of rules, so how do I know which one to put it in?
I usually just put it in any box which the rules allow but then I find towards the end of the game that the final 2 or 3 numbers cannot possibly go in the empty boxes which are left because doing so breaks the rules. As a result I have never been able to successfully complete a standard 9x9 grid.
I'm sure this is a common problem which everybody has encountered (and I am a fairly logically-minded person) but please can somebody tell me 'the trick' of how to overcome this.
I will give you 10 points and choose u as the best answer if you give me the best tip which works.
2007-01-25 18:37:45 · 8 answers · asked by Lara D 4 in Science & Mathematics ➔ Mathematics
Your approach is wrong. You say that if there are a few different places a particular digit can go, then you just pick one at random, but later find a problem.
You have to stop doing that. You should only put in a digit when it is the only possible digit that can go there, or when it is the only possible place in the row, column or 3x3 box that the digit can go.
If, for example, a cell is in a row which has 1,2,4 and 8 in it, and the same cell is in a column that has 3,5, 7 and 9, then the only poossible digit that can go in that square is 6.
If a square can possibly have a 2 or a 6 in it, but there is nowhere else in the row it is in for a 6 to go, then it must be a 6.
One useful technique is to look at a group of three rows together. If for example, there is a 4 in the first row in the 3rd box (3x3 box) and a 4 in the second row in the 1st box, then there must be a 4 in the third row in the 2nd box. This narrows the possible positions in that box down to three squares. Some of these squares may be filled already, so you can usually write in the 4 straight away. Repeat this techniques with other digits, and with each of the three groups of 3 rows, and with each of the three groups of 3 columns.
When you've done as much as you can using that method, in an easy Sudoku you'll be able to fill in the rest of the numbers easily. In a hard Sudoku, there are additional techniques you can use, but you've enough to be going on with there.
2007-01-25 19:58:43 · answer #1 · answered by Gnomon 6 · 2⤊ 0⤋
The thing about sudoku is you need to use the entire 9x9 grid and not focus solely on the 3x3s. Remember that each vertical line of 9 has the 1-9 and each horizontal line of 9 has 1-9. If you can eliminate all but 2-3 squares in a 3x3 grid, check the up/down and side/side lines to see if you can eliminate more squares.
2007-01-25 18:46:34 · answer #2 · answered by togglepet 2 · 2⤊ 0⤋
You should know the basic rules of sudoku when you play the game, right? So you should not just look @ the 3x3 grid. Look @ the adjacent numbers in the 9x9 grid too. Horizontally, vertically, and in the squares too! The numbers renge from 1-9. Check to eliminate as many possible squares.
Good luck! I hope this helps!
2007-01-25 21:41:35 · answer #3 · answered by Misumi Nagisa fan xD 2 · 0⤊ 0⤋
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2016-10-16 03:13:17 · answer #4 · answered by ? 4 · 0⤊ 0⤋
Basically, I find you just have to play with it... I've had times where I've gotten to the end, and I just have to move things around a little... I also find that marking what possible numbers can go in each square helps, then you can quickly see what your options are, and then mark in the squares with the least amount of options first (if that makes any sense)... and work your way from there..
I think it's all about practice, so keep trying, you'll get it!
2007-01-25 18:48:34 · answer #5 · answered by yogastar02 2 · 2⤊ 0⤋
It is not easy to explain how Sudoku can be solved in words. Go to a website such as www.sudoku.com and look for the tips.
2007-01-25 18:46:59 · answer #6 · answered by Anonymous · 2⤊ 0⤋
Good luck, Lara. I can never finish a whole grid myself. I guess, the more you do it (and check the solution as compared to your answers), the more familiar it becomes.
2007-01-25 18:47:52 · answer #7 · answered by tranquil 6 · 1⤊ 0⤋
use a sudoku solver software to help you step by step for the solution
2007-01-25 19:04:34 · answer #8 · answered by iyiogrenci 6 · 1⤊ 0⤋