Logic Masters India announces March Sudoku Test — LMI Spring Sudoku Test

By Francophone Sudoku Authors

Date : 26^th and 27^th March

Length : 120 minutes

IB and Submission Link : Here

Sudoku Theme is based on 'Spring' - Checkout the very interesting IB.

Based on suggestions from paper solvers, in this Sudoku test, rows / columns will be marked on pdf.
There will be a separate form for paper solvers for entering the answer keys.

See image below or login in the submission page to have a look at the new form. This form has one "Submit" button. Clicking on this button will submit all Sudokus that is filled in the form.



Like the LMI puzzle submission system, this form will do basic validations and warn if there are any entry mistakes (e.g. entering letters or 0 when 1-9 is expected OR entering less than 9 digits). If there is no warning, the text box color will turn white. See right textbox for "Greater Than and Killer" Sudoku above. [Please note that no warning does not mean answer is correct ]

Also note the tabs on the top of text boxes. To fill answers a different set of sudokus, click on the respective tab.

Answer validation
It is expected that for one particular Sudoku , a player should enter the answer either using the Paper Mode or using Online Mode. If the same Sudoku is submitted using both modes and only one of them is correct, it will be left to organizers to decide if points are to be awarded.

Different Sudokus can be submitted using different modes.

For online solvers
Show Cells to fill button is removed. Instead, the image will be marked with arrows specifying 2 rows or columns or a combination of those.

Hope everyone finds this feature useful. Please share any suggestions/questions/comments you may have.

All the examples are solvable online - Login and Click on "Show Examples"

I think no points should be awarded in such cases as, otherwise, this system can be (mis)used to make answer guesses.

Consider this situation -
Player X solved one Sudoku - while submitting, he first thought he will use Online mode, typed in 1 digit. Then decided to use paper mode, and typed the answer using text boxes.
So, logically he submitted using 2 modes, and one of them is wrong, and one is right.
But I think we should give points.

Of course, here we've completely different "Submit" buttons, so that situation may not arise.

[btw, player X was Akash in Double Delight ]

Well, it may arise. The reverse situation is more probable.

A very interesting and intriguing IB.... Having taken part in Sylvain's No Alphabet Contest, I am definitely looking forward to this test.... and knowing the French author team... This test is going to rock :)

Rishi

A very interesting IB. Only request is use of less number of colors so as to avoid confusion while printing on a B&W printer.

Indeed there is a lot of colors (in order to match with the theme of spring), but it should not affect printing in B&W.

Do the colours in "Greater than and killer" mean anything from a sudoku perspective?

As Ours Brun said, there will be some colors inside grids. It was hard not to be tempted using colors as the theme of test is Spring . However, we prepared grids (especially extra-regions) such that there will not be confusion while printing on a B&W printer.



No, nothing. You can solve this grid without worrying colors.

Fred

In sundoku, there are eight possible ray directions. If a ray is not marked (like in the example), does it imply that the numbers on that line CANNOT be in decreasing order.

No, it doesn't mean that ! There are no restrictions on cells where there isn't any ray, no matter if one could imagine a ray in that direction.

(The real fact is that I failed to build a 6*6 grid with an 8 rays' sun - if someone achieve this, I would be happy to see )

Fred

To be crystal clear concerning colors : colors don't have any importance, on any puzzle. They are purely decorative ; we were wishing to make this test a "festive" one, so, as Fred said, it was nearly impossible not to put some colors in...

You really need not worrying about that. You'd better worry about the puzzles themselves...!

Haha !!!

Don't worry, be happy !

Please stop scaring me

Rishi

happy as always!!! :-)
I am not able to understand the double sudoku. I am clear with the rules but not able to get an start in the sample puzzle in the IB.
Any volunteers for step by step help.....

Starting point are the 2 R's. There are only 2 ways to addition some 1-6 digits with result 18: 1+2+4+5+6 or 3+4+5+6. the consequence is that the 3 should be on first or last position, and on the opposite you have a pair 12. So you have 3 on R4C6 and R6C5, Then also on R2C4 (just classical placement). Then you can study the "E" columns where 2-3 must touch each other and 1-4 also.

I think that give a good start !

Fred

Neeraj, look at row 4.... the value of R is 18... now in a 6x6 the sum of all numbers is 21.... so number 3 is the uncommon part of the 2 way sum...
so we need 3 at one end and the numbers 1&2 at the other and 4,5,6 in between. Since 3 is already there in Col 1...R4C6 is a 3 and R4C12 has pencil marks of 1,2.

I have the images for solution ready but I am getting a server error when trying to upload...

Rishi

Thanx Rishi and Fred.............
That was excellent......... i cud solve it now....

The online example image (SunDoku) is now marked with Arrows.

I think the best decision is to take into account the last submission, whether by one or the other mode. A player can solve on paper, submit, and then realize there is a mistake. Perhaps he choose to solve again with interface, and submit again. Or the reverse situation. Of course, if the first submission is correct and the second one not, it's a pity for the player...
So please, don't submit a false code if you had already submit the right one

Fred

That seems ideal. We'll stick to this rule (at least for this test, and revisit in the next test if required)

Instructions in Chinese available in SudokuFans forum - http://www.sudokufans.org.cn/forums/index.php?showtopic=247