Login Register WSPC 2017 • Schedule • Participation • Location • WSC • WPC • Contact •Search •Recent





stuck in this sudoku
   LMI Essentials -> Solving Techniques159 posts • Page 6 of 7 • 1 2 3 4 5 6 7
Fred76
Subject: RE: stuck in this sudoku @ 2015-11-13 11:57 PM (#19920 - in reply to #8611) (#19920) Top



Diagonal Vision Author

Posts: 337
10010010020
Location: Switzerland		I thought that you created 2 group sum sudoku 6*6 and this one was too easy for the tournament
ghirsch
Subject: Re: stuck in this sudoku @ 2015-11-15 4:47 AM (#19946 - in reply to #8611) (#19946) Top




Posts: 102
100
Location: United States		I've been working my way through Thomas Snyder's Art of Sudoku book, and I'm pretty stuck on this one. Can anyone help me out (preferably with just a step or two to get me on the right track)? I'm probably just missing something obvious but I can't seem to come up with any ideas for what to do.

Image and video hosting by TinyPic

Edited by ghirsch 2015-11-15 4:51 AM
swaroop2011
Subject: Re: stuck in this sudoku @ 2015-11-15 6:13 AM (#19947 - in reply to #19946) (#19947) Top



PR 2020 (Shading and Loops) Author

Posts: 668
500100202020
Location: India
ghirsch - 2015-11-15 4:47 AM

I've been working my way through Thomas Snyder's Art of Sudoku book, and I'm pretty stuck on this one. Can anyone help me out (preferably with just a step or two to get me on the right track)? I'm probably just missing something obvious but I can't seem to come up with any ideas for what to do.

Image and video hosting by TinyPic


9 at r7c7 due to 34 pair at r1c7 and r6c7

Edited by swaroop2011 2015-11-15 6:13 AM
ghirsch
Subject: Re: stuck in this sudoku @ 2015-11-15 6:39 AM (#19948 - in reply to #8611) (#19948) Top




Posts: 102
100
Location: United States		Thanks Swaroop, that did the trick. It's a pretty tough deduction to find though, I guess I still need more practice.
kishy72
Subject: Re: stuck in this sudoku @ 2016-04-05 1:38 PM (#21433 - in reply to #8611) (#21433) Top


SM 2020 (Math) Author

Posts: 419
100100100100
Location: India		Anti-diagonal from the Russian GP .I solved this particular sudoku for a long time and had to guess to finish it .Could someone tell me how to continue logically here ?

Image and video hosting by TinyPic

Edited by kishy72 2016-04-05 1:39 PM
rajeshk
Subject: Re: stuck in this sudoku @ 2016-04-05 6:00 PM (#21436 - in reply to #21433) (#21436) Top



WSPC Organizer

Posts: 542
5002020
Location: India
kishy72 - 2016-04-05 1:38 PM

Anti-diagonal from the Russian GP .I solved this particular sudoku for a long time and had to guess to finish it .Could someone tell me how to continue logically here ?

Image and video hosting by TinyPic


Center has to be 1. In case we put 7 there then there will be no place left to put 7 in 6th Box.
kishy72
Subject: Re: stuck in this sudoku @ 2019-10-25 1:25 PM (#27343 - in reply to #8611) (#27343) Top


SM 2020 (Math) Author

Posts: 419
100100100100
Location: India		The following sudoku is from CSOC 63 PB.I couldn't understand the English version of the rules given in the example image.I assumed it to be a clone sudoku and started solving like that in contest.However, it quickly broke after that.


Can someone clarify what the rules imply ?



(CP.png)



(IB.png)



Attachments
----------------
Attachments CP.png (61KB - 1 downloads)
Attachments IB.png (100KB - 0 downloads)
kishy72
Subject: Re: stuck in this sudoku @ 2019-10-25 1:40 PM (#27344 - in reply to #8611) (#27344) Top


SM 2020 (Math) Author

Posts: 419
100100100100
Location: India		Also, can the admin kindly specify alternate websites for uploading images here ? Earlier, I used to upload from tinypic which seems to have shut down now.
The images posted above are screenshots and are too big and uncomfortable looking.
xiao01wei
Subject: Re: stuck in this sudoku @ 2019-10-26 7:23 PM (#27348 - in reply to #8611) (#27348) Top




Posts: 6

Location: China		CSOC 63 P13's rule:
if there is two same shape, for example, two vertical domino shape, there will be 4 numbers in these 2 shapes:
A        C
B        D
and
if A>B, and then the result is C>D at the same time
if A<B, and then the result is C<D at the same time
if C>D, and then the result is A>B at the same time
if C<D, and then the result is A<B at the same time
the same inequality between the four numbers in two shapes with corresponding position

Edited by xiao01wei 2019-10-26 7:30 PM
kishy72
Subject: Re: stuck in this sudoku @ 2019-10-26 11:38 PM (#27350 - in reply to #27348) (#27350) Top


SM 2020 (Math) Author

Posts: 419
100100100100
Location: India
xiao01wei - 2019-10-26 7:23 PM

CSOC 63 P13's rule:
if there is two same shape, for example, two vertical domino shape, there will be 4 numbers in these 2 shapes:
A        C
B        D
and
if A>B, and then the result is C>D at the same time
if A if C>D, and then the result is A>B at the same time
if C the same inequality between the four numbers in two shapes with corresponding position


Thanks a lot Xiao Wei for the clarification ! I finished the sudoku now.It is certainly an interesting variant and I will look forward to seeing more of it in future.
kishy72
Subject: Re: stuck in this sudoku @ 2019-11-23 12:36 PM (#27362 - in reply to #8611) (#27362) Top


SM 2020 (Math) Author

Posts: 419
100100100100
Location: India		Little Killer from LMD portal by 'Realshaggy'

This sudoku is pure evil.I tried everything that I usually encounter in Little Killer Sudokus from totalling clues,seeing min-max possibilities, clue interaction etc., but this sudoku just yielded nothing.I have been trying for the past week or so to complete this without success.It's kind of demotivating in a way that after so many years of solving sudoku, there are still some that I am unable to be complete. Kindly someone share the break-in for this ' psycho little killer '.



(LK.jpg)



Attachments
----------------
Attachments LK.jpg (45KB - 2 downloads)
Puzzle_Maestro
Subject: Re: stuck in this sudoku @ 2019-11-23 6:15 PM (#27363 - in reply to #8611) (#27363) Top




Posts: 25
20
Location: United Kingdom		If you add up the clues on the top and bottom rows, you get 369. Adding up the clues in the left and right gives 327. The difference between the two is 42.

Observe that the arrows on the left and right point to 6 cells which are not pointed to by the arrows on top and bottom (with minimum sum 3*(1+2)=9), and similarly the arrows on top and bottom point to 6 cells not pointed to by arrows on the left and right (maximum sum 3*(8+9)=51). The difference between them must be 42, and since the maximum difference between them is 42, we can establish a few 12 and 89 pairs.
kishy72
Subject: Re: stuck in this sudoku @ 2019-11-25 8:52 AM (#27364 - in reply to #27363) (#27364) Top


SM 2020 (Math) Author

Posts: 419
100100100100
Location: India
Puzzle_Maestro - 2019-11-23 6:15 PM

If you add up the clues on the top and bottom rows, you get 369. Adding up the clues in the left and right gives 327. The difference between the two is 42.

Observe that the arrows on the left and right point to 6 cells which are not pointed to by the arrows on top and bottom (with minimum sum 3*(1+2)=9), and similarly the arrows on top and bottom point to 6 cells not pointed to by arrows on the left and right (maximum sum 3*(8+9)=51). The difference between them must be 42, and since the maximum difference between them is 42, we can establish a few 12 and 89 pairs.


Thanks a lot ! I could complete it with your pointer.
159 posts • Page 6 of 7 • 1 2 3 4 5 6 7
Jump to forum :
Search this forum
Printer friendly version