Thursday, October 20, 2011

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Solving Sudoku Using Excel | Download Workbooks And Procedures To Solve Sudoku

Almost all Newspaper and Journal started publishing a daily Sudoku puzzle in their comic or strip pages. And most of us, including me has nearly became addicted to solving these puzzles.

Sudoku is a 9x9 grid. In the newspaper each day, they may fill in 20-30% of the 81 numbers in the grid. Your goal is to fill in the remaining numbers. Each row, column, and 3x3 sub-grid must contain each of the digits from 1 through 9 without any digits repeating.

When you consider the puzzle below, the top left square can not contain 1, 5, 6 or 8 because these numbers already appear in the first column. The top left square can not contain 4 or 9 because these numbers already appear in the same row. It can not contain a 4 because a 4 appears in the upper-left 3x3 sub-grid.

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Thus, the possible numbers for the top left cell are 2, 3, or 7. Trying to solve the puzzle from the morning paper quickly consumes all of the time for breakfast and can make you late for work if you are not careful.

Microsoft Excel Work Book By Mike Oldroyd :

Mike Oldroyd has created an Excel workbook to solve Sudoku. I have attached that, and the VBA code is also available. So anyone who is interested can poke inside to see how it works.

This workbook is very cool. It gives you the complete solution in a few seconds. It would probably be cooler if you want to reveal the one square that you may stuck on. Sometimes, if you could just solve one square, the rest of the puzzle would start to fall into place.

I've zipped it at this link. For more about Mike, visit http://www.mikeoldroyd.com/.

Microsoft Excel Work Book By Jobey Jones:

There is also another workbook from Jobey Jones, England. This is a workbook that is a Sudoku Assistant. Instead of giving you the solution, it makes quick work of a lot of the work involved in solving Sudoku.

Enter the puzzle in his grid, and many formulas provide statistics. The fact is that the digits from 1 through 9 add up to 45, so first Jobey figures out the total for each row, column, subgrid and compares this to 45. He reports which numbers are missing in the row, the column, and each subgrid.

My favorite part is this section where he shows which numbers are still possible in each cell of the grid. Clearly, the 2nd column in the 5th row must be a 9, since that is the only value left.

Solve Sudoku with Excel

If you still want to do some of the work of solving Sudoku, download this zipped sudoku2.zip.

If you have both programs, you can enter the puzzle in one form, then use Copy / Paste Special - Values to copy to the other program.

Microsoft Excel Work Book By Jerry:

Jerry from Erie, New York has created another workbook that is a Sudoku solver. This one is cool because it lets you see how to solve Sudoku iteratively. Enter the puzzle from the paper. Jerry's workbook shows you which squares can be solved right now. Click Solve to put those numbers in the grid. Then, new squares light up in yellow as being solvable.

Press Solve to put those squares in the grid. If you are new to Sudoku, this will help you to understand that solving Sudoku is a step by step process.

Enter the puzzle in the upper left grid.

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The upper right grid will light up in one of two shades of yellow to tell you the squares that can be solved.

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Here is how it knows the lower right square has to be a 6: All of the other numbers from 1 through 9 are already used: 2, 3, 4, and 5 are in the same row. 4, 7, and 9 are in the same column. 1, 2, 5, and 8 are in the same subgroup. This means the only possibility left is a 6.

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Click the Solve!!! button to transfer the yellow squares to the upper left grid. Once that information is known, new yellow squares show up in the upper right. Continue the process.

Here is a good example in the second round. There are three unfilled cells in the right column. They all could host a 3. The one in yellow can only host a 3, meaning that the square with the possibility of a 3 or 8 must be an 8. In these cases, the 3,8 square is highlighted in lighter yellow and when you click solve, an 8 will be sent to the grid. The lower right grid shows you which of the light-yellow numbers will go to the grid. Download it zipped from JerrySuduko.zip

Microsoft Excel Work Book By David Dawson:

Update For 2010! David Dawson of Sydney has created along his version of a MS Excel Sudoku solver. The interface is colorful and offers not only the working version of the puzzle, but the starting puzzle as well.

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You may download the zipped version of David's Puzzle using DDawsonSuduko.zip

bench3 provides examples and procedures for illustration only, without warranty either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose. Also, the workbooks and procedures on this web site are provided "as is" and we do not guarantee that they can be used in all situations.

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Haja Peer Mohamed H, Software Engineer by profession, Author, Founder and CEO of "bench3" you can connect with me on Twitter , Facebook and also onGoogle+

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