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Spaces **are ignored.** If it's valid, please use the "Email This Board" button to send it to [email protected] Make the corrections, and continue the puzzle on paper. The first World Championship Sudoku Tournament was held in Lucca, Italy in March of 2006. weblink

Since any group can only have one of a given value, the blue cells must represent the false values so all bright green cells can safely be assigned the value 9. What if your first digit entered was one which you accidentally hit the wrong key on? Proof: If a cell sharing a group with both branch cells is assigned the 'z' candidate, then neither branch can be assigned the 'z' candidate. It is also a place to offer good examples of techniques.

If you extend this to looking for 'sub group exclusions', 'twins', 'triplets' and 'chains' still no luck. Only progress to more **difficult steps** when simpler steps neither reveal new values nor exclude candidates from blank cells. What kind of person would make a good sudoku player? There must be an XY chain somewhere...

I guess I'm careless or something, it seems out of 10 games, like half of them I have to do twice to get it correct. This is rarely the best route to follow. Straight Dope Message Board > Main > The Game Room Fixing sudoku mistakes User Name Remember Me? Printable Sudoku Thread Tools Display Modes #1 06-25-2010, 08:59 AM panache45 Member Join Date: Oct 2000 Location: NE Ohio (the 'burbs) Posts: 31,487 Fixing sudoku mistakes I've just begun doing

The following steps (in increasing complexity) will reduce the number of candidates in blank cells so, sooner or later, a 'single' candidate or 'hidden single' candidate will appear. Sudoku Tips And Tricks All candidates except 1 & 9 can safely be excluded from these two cells as one cell must be the 1 while the other must be the 9. You can edit the sudoku at any time - entering solutions in the small board or editing candidates. (Toggle between highlighting and editing using the radio buttons at the top.) A all numbers from 1 to 9 appear in each row, etc.)?

Much still remains in javascript but it's mostly user interface stuff now. ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: http://0.0.0.10/ Connection to 0.0.0.10 failed. A network of chains will be **built up** that could help you solve a difficult point in the puzzle. 'Use 3D chains' means to follow the chains within a cell. Repeating this technique around the grid we soon discover that there are blue cells sharing the same group.

But I have no clue where the error is, I don't know which numbers are wrong. This is indeed a hard puzzle. How To Solve Sudoku Mathematically All rights reserved.REDDIT and the ALIEN Logo are registered trademarks of reddit inc.πRendered by PID 5657 on app-586 at 2016-12-07 02:07:09.643543+00:00 running 22be709 country code: DE. Sudoku Rules Enter periods (.) or zeros (0) where the puzzle is missing a number.

So let's try a 2. Computers can use this technique to solve any maze problem with 'brute force'. Most people I **suspect just pick a spot** at random to start. I just have to start over again and hopefully make no errors this time... How To Play Sudoku

Printing Puzzles You will need to set your browser to print backgrounds. Copyright Andrew Stuart @ Syndicated Puzzles Inc, 2005-2014 Sudoku IntroductionSudokuHistoryStrategyAdvancedTheorySamuraiUnsolvableTypesGuidesGuessingSymmetryNewsBooks Dragon Daily Online Forum Help Manual Sudoku Solver Download Sudoku Dragon for a free 23 day trial on your PC. I use a dot; top left =1, center top=2 top right =3 center left = 4 one dot in the middle for 5, etc. check over here Sadly enough, the last possible reason is something which not everyone is aware of and is difficult to tell in advance.

Start by checking each row - from top to bottom - that you haven't duplicated any numbers by accident. At first glance one might think that it isn't possible to place a 7 in the top three regions. You can find information about Sudoku tournaments on the Internet.

No. Solving the Puzzle If you press "Solve" the Sudoku Assistant will run through all the way to a solution in short order. More questions Have you ever done a Sudoku puzzle? In the example below, the right box only has candidate 2's in its bottom row.

linear000 linearMarks [puzzle]sdk simple table chain table return to standard view You can also load a set of puzzles, either from your own data (81 numbers per line) or from one Therefore candidates 5 & 7 that are in the highlighted cells can be excluded. When I start a new puzzle, where should I begin? this content This means that a 3 and 5 can not go into cell (R1,C3).

You will notice that in column 1 we are missing two numbers. permalinkembedsaveparentgive gold[–]DaveTime -1 points0 points1 point 1 year ago(2 children)I disagree, I would like to think that people don't put values in unless they are certain they are correct. Apparently, I've just made my first mistake. I am continuing to document the various strategies that I and many other people have invented.

Entering Puzzles The fastest way to enter a puzzle is to enter it in Advanced View. I've tried to give credit where credit is due. All chains will only explore un-chained candidates, ie they will not join up. In the example below, the candidates 6 & 8 in columns six and seven form a Naked Pair within the row.

The ball magically unraveled to show the route to the center of the Labyrinth and the Minotaur. [The Labyrinth was an especially fiendish type of maze also devised by Daedalus]. Consequently, one branch would be the 'x' and the other the 'y' leaving the 'stem' without a candidate, an invalid state. Also, whenever a candidate outside the chain relates by column, row or box to two alternately colored cells in a conjugate chain, that 'non-chain' candidate can be excluded. Many people have written to me to comment about multiple solutions for a given Sudoku.

Also, let us know if you were able to solve the puzzle with the advice given to you. Since, one of those cells must be a 2, no cells in that row outside that box can be a 2. It is the complete Sudoku package, including hints, guides, and many new puzzle types. Formal definition: Given 3 cells where - all cells have exactly 2 candidates they share the same 3 candidates in the form - xy, yz, xz one cell (the Y 'stem'

The more the merrier. I'd be very interested to study examples that can't be solved on this page.