Yajilin Yacht (28th Jul - 17th Aug) has started Discuss
stuck in this sudoku159 posts • Page 6 of 7 • 1 2 3 4 5 6 7
@ 2015-11-13 2:33 PM (#19918 - in reply to #19917) (#19918) Top

vopani



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vopani posted @ 2015-11-13 2:33 PM

RameshLMI - 2015-11-13 2:26 PM

Thanks Rohan.

But I am unable to decipher this logical deduction,

R5C1 + R5C2 = 8
R6C1 + R6C2 = 8

Can someone make this clear?

Look at Row4 and Row5. Two sums of 18 and 9 are given (which used 8 cells out of 12).
So, the remaining 4 cells: R4C1 + R4C2 + R5C1 + R5C2 = 42 - 9 - 18 = 15 (to make the total of the two rows 42)

Since R4C1 and R4C2 were found to be 3 & 4, we get R5C1 + R5C2 = 15 - 7 = 8.
And using the 16-sum, R6C1 + R6C2 = 8.
@ 2015-11-13 11:29 PM (#19919 - in reply to #8611) (#19919) Top

neerajmehrotra



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neerajmehrotra posted @ 2015-11-13 11:29 PM

I was lucky to have guessed a better start...could solve it easily then.... Its almost impossible for me decipher Rohan's Logic during a competition.... :)
@ 2015-11-13 11:57 PM (#19920 - in reply to #8611) (#19920) Top

Fred76




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Fred76 posted @ 2015-11-13 11:57 PM

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

ghirsch



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ghirsch posted @ 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.

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Edited by ghirsch 2015-11-15 4:51 AM
@ 2015-11-15 6:13 AM (#19947 - in reply to #19946) (#19947) Top

swaroop2011




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swaroop2011 posted @ 2015-11-15 6:13 AM

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.

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9 at r7c7 due to 34 pair at r1c7 and r6c7

Edited by swaroop2011 2015-11-15 6:13 AM
@ 2015-11-15 6:39 AM (#19948 - in reply to #8611) (#19948) Top

ghirsch



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Country : United States

ghirsch posted @ 2015-11-15 6:39 AM

Thanks Swaroop, that did the trick. It's a pretty tough deduction to find though, I guess I still need more practice.
@ 2016-04-05 1:38 PM (#21433 - in reply to #8611) (#21433) Top

kishy72



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kishy72 posted @ 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 ?

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Edited by kishy72 2016-04-05 1:39 PM
@ 2016-04-05 6:00 PM (#21436 - in reply to #21433) (#21436) Top

rajeshk



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rajeshk posted @ 2016-04-05 6:00 PM

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.
@ 2019-10-25 1:25 PM (#27343 - in reply to #8611) (#27343) Top

kishy72



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Country : India

kishy72 posted @ 2019-10-25 1:25 PM

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

kishy72



Posts: 411
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Country : India

kishy72 posted @ 2019-10-25 1:40 PM

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.
@ 2019-10-26 7:23 PM (#27348 - in reply to #8611) (#27348) Top

xiao01wei



Posts: 6

Country : China

xiao01wei posted @ 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<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
@ 2019-10-26 11:38 PM (#27350 - in reply to #27348) (#27350) Top

kishy72



Posts: 411
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Country : India

kishy72 posted @ 2019-10-26 11:38 PM

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.
@ 2019-11-23 12:36 PM (#27362 - in reply to #8611) (#27362) Top

kishy72



Posts: 411
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Country : India

kishy72 posted @ 2019-11-23 12:36 PM

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

Puzzle_Maestro



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Country : United Kingdom

Puzzle_Maestro posted @ 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.
@ 2019-11-25 8:52 AM (#27364 - in reply to #27363) (#27364) Top

kishy72



Posts: 411
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Country : India

kishy72 posted @ 2019-11-25 8:52 AM

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.
stuck in this sudoku159 posts • Page 6 of 7 • 1 2 3 4 5 6 7
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