Thread - LMI Spring Sudoku Test (26th/27th March)

Country : India

Administrator posted @ 2011-03-16 10:01 AM

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

@ 2011-03-16 10:03 AM (#3746 - in reply to #3744) (#3746) Top

rakesh_rai

Posts: 774

Country : India

rakesh_rai posted @ 2011-03-16 10:03 AM

Administrator - 2011-03-16 9:50 AM

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.

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

@ 2011-03-16 10:09 AM (#3747 - in reply to #3746) (#3747) Top

debmohanty

Country : India

debmohanty posted @ 2011-03-16 10:09 AM

rakesh_rai - 2011-03-16 10:03 AM

Administrator - 2011-03-16 9:50 AM

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.

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 ]

@ 2011-03-16 10:12 AM (#3748 - in reply to #3747) (#3748) Top

debmohanty

Country : India

debmohanty posted @ 2011-03-16 10:12 AM

debmohanty - 2011-03-16 10:09 AM

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

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

@ 2011-03-16 3:07 PM (#3750 - in reply to #3740) (#3750) Top

Posts: 460

Country : India

purifire posted @ 2011-03-16 3:07 PM

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

@ 2011-03-16 3:18 PM (#3751 - in reply to #3740) (#3751) Top

neerajmehrotra

Posts: 329

Country : India

neerajmehrotra posted @ 2011-03-16 3:18 PM

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.

@ 2011-03-16 4:12 PM (#3752 - in reply to #3740) (#3752) Top

Ours brun

Posts: 148

Country : France

Ours brun posted @ 2011-03-16 4:12 PM

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.

@ 2011-03-16 6:15 PM (#3753 - in reply to #3752) (#3753) Top

rakesh_rai

Posts: 774

Country : India

rakesh_rai posted @ 2011-03-16 6:15 PM

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

@ 2011-03-16 6:29 PM (#3754 - in reply to #3753) (#3754) Top

Posts: 337

Country : Switzerland

Fred76 posted @ 2011-03-16 6:29 PM

neerajmehrotra - 2011-03-16 3:18 PM

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.

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.

rakesh_rai - 2011-03-16 6:15 PM

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

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

Fred

@ 2011-03-16 6:50 PM (#3755 - in reply to #3754) (#3755) Top

rakesh_rai

Posts: 774

Country : India

rakesh_rai posted @ 2011-03-16 6:50 PM

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.

@ 2011-03-16 7:12 PM (#3756 - in reply to #3755) (#3756) Top

Posts: 337

Country : Switzerland

Fred76 posted @ 2011-03-16 7:12 PM

rakesh_rai - 2011-03-16 6:50 PM

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

@ 2011-03-16 7:40 PM (#3757 - in reply to #3754) (#3757) Top

Ours brun

Posts: 148

Country : France

Ours brun posted @ 2011-03-16 7:40 PM

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...!

@ 2011-03-16 7:43 PM (#3758 - in reply to #3756) (#3758) Top

Posts: 337

Country : Switzerland

Fred76 posted @ 2011-03-16 7:43 PM

Haha !!!

Don't worry, be happy !

@ 2011-03-16 7:54 PM (#3759 - in reply to #3757) (#3759) Top

Posts: 460

Country : India

purifire posted @ 2011-03-16 7:54 PM

Ours brun - 2011-03-16 7:40 PM

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

Please stop scaring me

Rishi

@ 2011-03-16 9:10 PM (#3760 - in reply to #3759) (#3760) Top

neerajmehrotra

Posts: 329

Country : India

neerajmehrotra posted @ 2011-03-16 9:10 PM

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.....

@ 2011-03-16 9:50 PM (#3761 - in reply to #3760) (#3761) Top

Posts: 337

Country : Switzerland

Fred76 posted @ 2011-03-16 9:50 PM

neerajmehrotra - 2011-03-16 9:10 PM

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

@ 2011-03-16 9:51 PM (#3762 - in reply to #3760) (#3762) Top

Posts: 460

Country : India

purifire posted @ 2011-03-16 9:51 PM

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.

@ 2011-03-16 9:53 PM (#3763 - in reply to #3761) (#3763) Top

Posts: 460

Country : India

purifire posted @ 2011-03-16 9:53 PM

Fred76 - 2011-03-16 9:50 PM

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

Rishi

@ 2011-03-16 10:46 PM (#3764 - in reply to #3740) (#3764) Top

neerajmehrotra

Posts: 329

Country : India

neerajmehrotra posted @ 2011-03-16 10:46 PM

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

@ 2011-03-18 10:52 AM (#3777 - in reply to #3764) (#3777) Top

Country : India

Administrator posted @ 2011-03-18 10:52 AM

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

@ 2011-03-18 4:14 PM (#3780 - in reply to #3746) (#3780) Top

Posts: 337

Country : Switzerland

Fred76 posted @ 2011-03-18 4:14 PM

rakesh_rai - 2011-03-16 10:03 AM

Administrator - 2011-03-16 9:50 AM

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.

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

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

@ 2011-03-18 4:29 PM (#3781 - in reply to #3780) (#3781) Top

Country : India

Administrator posted @ 2011-03-18 4:29 PM

Fred76 - 2011-03-18 4:14 PM

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...

Fred

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

@ 2011-03-19 9:36 PM (#3786 - in reply to #3781) (#3786) Top