Thread - Double Delight - LMI February Sudoku Test

@ 2011-02-14 11:09 PM (#3515 - in reply to #3510) (#3515) Top

purifire

Posts: 460

Country : India

purifire posted @ 2011-02-14 11:09 PM

rakesh_rai - 2011-02-14 7:31 PM

Paper solvers had it simplified this time with a simpler answer entry system (by and large, with a few exceptions). Of course, there can be further improvements which can be discussed and sorted out.

I am in the minority who are solving online. And there is one thing which I would like to mention, from an improvement perspective in future tests - the representation of the diagonal lines on the grid. This time we had five grids which had a diagonal constraint. The example on the site also had diagonal lines and was represented using gray lines. But in the test four out of the five grids had black (dashed) lines running diagonally. I am attaching an image which brings out the differences clearly. The pencilmarks in the gray one are clear, but the other one requires a lot of eye exercise while solving the sudoku - especially the numbers 1,3,5,7 and 9 - each of which interfere with one or more of the diagonal lines.

We can surely avoid this by choosing slightly light colors for these lines.

Thanks Rakesh for bring this up.. I have received a lot of comments on the use of lines as diagonals and will avoid it in the future.

Rishi

@ 2011-02-15 2:48 AM (#3516 - in reply to #3357) (#3516) Top

rob

Posts: 170

Country : Germany

rob posted @ 2011-02-15 2:48 AM

Thanks for the great puzzles. I'm not usually much into Sudoku, but these were great fun. (I did poorly on the test, but solved the rest later.)

By the way, the Anti Knight Disjoint is solvable without the "disjoint" constraint. Yes, finding this out was an accident.

Cheers
Rob

@ 2011-02-15 8:42 AM (#3517 - in reply to #3516) (#3517) Top

WaterlooMathie

Posts: 10

Country : Canada

WaterlooMathie posted @ 2011-02-15 8:42 AM

I didn't see the symmetry of the 150 point puzzle but I was able to solve it logically. For instance you can see from the first diagram of Rishi's, that R2C8 is a 5 because the anti-knight moves cancel out the possibilities for 5 being in any other spot on the diagonal.

Edited by WaterlooMathie 2011-02-15 8:43 AM

@ 2011-02-21 12:11 AM (#3561 - in reply to #3357) (#3561) Top

pafcio123

Posts: 4

Country : Poland

pafcio123 posted @ 2011-02-21 12:11 AM

Hi, Is there anywhere password to get the PB?

regards

@ 2011-02-21 4:44 AM (#3564 - in reply to #3561) (#3564) Top

Administrator

Country : India

Administrator posted @ 2011-02-21 4:44 AM

pafcio123 - 2011-02-21 12:11 AM

Hi, Is there anywhere password to get the PB?

regards

Please login in the Double Delight page and you should see the password.


	@ 2011-02-14 11:09 PM (#3515 - in reply to #3510) (#3515) Top
purifire Posts: 460 Country : India	purifire posted @ 2011-02-14 11:09 PM rakesh_rai - 2011-02-14 7:31 PM Paper solvers had it simplified this time with a simpler answer entry system (by and large, with a few exceptions). Of course, there can be further improvements which can be discussed and sorted out. I am in the minority who are solving online. And there is one thing which I would like to mention, from an improvement perspective in future tests - the representation of the diagonal lines on the grid. This time we had five grids which had a diagonal constraint. The example on the site also had diagonal lines and was represented using gray lines. But in the test four out of the five grids had black (dashed) lines running diagonally. I am attaching an image which brings out the differences clearly. The pencilmarks in the gray one are clear, but the other one requires a lot of eye exercise while solving the sudoku - especially the numbers 1,3,5,7 and 9 - each of which interfere with one or more of the diagonal lines. We can surely avoid this by choosing slightly light colors for these lines. Thanks Rakesh for bring this up.. I have received a lot of comments on the use of lines as diagonals and will avoid it in the future. Rishi
	@ 2011-02-15 2:48 AM (#3516 - in reply to #3357) (#3516) Top
rob Posts: 170 Country : Germany	rob posted @ 2011-02-15 2:48 AM Thanks for the great puzzles. I'm not usually much into Sudoku, but these were great fun. (I did poorly on the test, but solved the rest later.) By the way, the Anti Knight Disjoint is solvable without the "disjoint" constraint. Yes, finding this out was an accident. Cheers Rob
	@ 2011-02-15 8:42 AM (#3517 - in reply to #3516) (#3517) Top
WaterlooMathie Posts: 10 Country : Canada	WaterlooMathie posted @ 2011-02-15 8:42 AM I didn't see the symmetry of the 150 point puzzle but I was able to solve it logically. For instance you can see from the first diagram of Rishi's, that R2C8 is a 5 because the anti-knight moves cancel out the possibilities for 5 being in any other spot on the diagonal. Edited by WaterlooMathie 2011-02-15 8:43 AM
	@ 2011-02-21 12:11 AM (#3561 - in reply to #3357) (#3561) Top
pafcio123 Posts: 4 Country : Poland	pafcio123 posted @ 2011-02-21 12:11 AM Hi, Is there anywhere password to get the PB? regards
	@ 2011-02-21 4:44 AM (#3564 - in reply to #3561) (#3564) Top
Administrator Country : India	Administrator posted @ 2011-02-21 4:44 AM pafcio123 - 2011-02-21 12:11 AM Hi, Is there anywhere password to get the PB? regards Please login in the Double Delight page and you should see the password.