Thread - sudoku help

@ 2016-03-19 11:21 AM (#21309) (#21309) Top

Posts: 22

Country : India

Vishal posted @ 2016-03-19 11:21 AM

Anyone, please help me with this sudoku; I'm unable to proceed further
I'm trying to attach the image file, but the attempt is getting failed again and again (file size is 37 KB)

Edited by Vishal 2016-03-19 11:27 AM

@ 2016-03-19 1:02 PM (#21310 - in reply to #21309) (#21310) Top

prasanna16391

Posts: 1801

Country : India

prasanna16391 posted @ 2016-03-19 1:02 PM

Try uploading on an image hosting site and sharing the link.

@ 2016-03-19 2:13 PM (#21311 - in reply to #21309) (#21311) Top

Vishal

Posts: 22

Country : India

Vishal posted @ 2016-03-19 2:13 PM

Here's the link to image: http://i68.tinypic.com/34r6mpv.jpg

By the way, its LMI puzzle( Classic Set -C #132).

@ 2016-03-19 2:42 PM (#21312 - in reply to #21311) (#21312) Top

kishy72

Posts: 419

Country : India

kishy72 posted @ 2016-03-19 2:42 PM

Vishal - 2016-03-19 2:13 PM

Here's the link to image: http://i68.tinypic.com/34r6mpv.jpg

By the way, its LMI puzzle( Classic Set -C #132).

6 in R4C6 means a 6 in R1C4 or R3C4 which takes off a 6 from R8C4 .Hence for the 8th row,you have a pair (48)in R8C1 and R8C4 ---->R8C8 becomes a 6 .

@ 2016-03-19 3:48 PM (#21313 - in reply to #21309) (#21313) Top

Vishal

Posts: 22

Country : India

Vishal posted @ 2016-03-19 3:48 PM

Not all possible pencil marks were there in previous image....
Here's the link to new image: http://i66.tinypic.com/6oipnp.jpg

One more sudoku:
link: http://i66.tinypic.com/2dpb2g.jpg

Stuck in both the above sudoku...

@ 2016-03-19 5:15 PM (#21314 - in reply to #21309) (#21314) Top

prasanna16391

Posts: 1801

Country : India

prasanna16391 posted @ 2016-03-19 5:15 PM

For the first one, if 2 is in R5C1, it will have to be in C5 for both R4 and R9. So, 2 cannot be in R5C1.

@ 2016-03-20 10:30 AM (#21316 - in reply to #21314) (#21316) Top

Vishal

Posts: 22

Country : India

Vishal posted @ 2016-03-20 10:30 AM

Thanks Prasanna
I got what you're saying....but, I want to confirm that is that a logical way?? I mean, in this case one have to assume and deduce if 2 were to come in R2C1 then after 3-4 steps it would be a contradiction...
Though I myself use the aforesaid technique but I'm not sure about its rationality.

@ 2016-03-20 10:31 AM (#21317 - in reply to #21312) (#21317) Top

Vishal

Posts: 22

Country : India

Vishal posted @ 2016-03-20 10:31 AM

kishy72 - 2016-03-19 2:42 PM

Vishal - 2016-03-19 2:13 PM

Here's the link to image: http://i68.tinypic.com/34r6mpv.jpg

By the way, its LMI puzzle( Classic Set -C #132).

6 in R4C6 means a 6 in R1C4 or R3C4 which takes off a 6 from R8C4 .Hence for the 8th row,you have a pair (48)in R8C1 and R8C4 ---->R8C8 becomes a 6 .

Thanks Kishore

@ 2016-03-23 6:10 PM (#21335 - in reply to #21317) (#21335) Top

Vishal

Posts: 22

Country : India

Vishal posted @ 2016-03-23 6:10 PM

Stuck here...anyone please guide through next steps.

@ 2016-03-23 7:11 PM (#21336 - in reply to #21335) (#21336) Top

dp_94

Posts: 25

Country : India

dp_94 posted @ 2016-03-23 7:11 PM

you made a mistake at R9C4 possible candidates should be 579 and 6 can not be there since 6 is already in that box but this sudoku also requires some advanced sudoku techniques like colouring, XYZ Wing,X-Y Chain. In Completion Even the world best sudoku solver's guess in such kind of puzzles they just wait a few seconds if they dont get any clue they just guess at that point some even guess multiple times.

you can try this site for better understanding of these kind of advanced techniques http://www.sudokuwiki.org/sudoku.htm

and these for practice

http://www.mindoku.com/games
http://www.sudokucup.com/
http://www.fed-sudoku.eu/enindex.php?co=vysl&tab=easy
http://www.speedsudoku.com/public.php?mode=home&no_cookies=

@ 2016-03-24 11:26 AM (#21338 - in reply to #21336) (#21338) Top

Vishal

Posts: 22

Country : India

Vishal posted @ 2016-03-24 11:26 AM

dp_94 - 2016-03-23 7:11 PM

you made a mistake at R9C4 possible candidates should be 579 and 6 can not be there since 6 is already in that box but this sudoku also requires some advanced sudoku techniques like colouring, XYZ Wing,X-Y Chain. In Completion Even the world best sudoku solver's guess in such kind of puzzles they just wait a few seconds if they dont get any clue they just guess at that point some even guess multiple times.

you can try this site for better understanding of these kind of advanced techniques http://www.sudokuwiki.org/sudoku.htm

and these for practice

http://www.mindoku.com/games
http://www.sudokucup.com/
http://www.fed-sudoku.eu/enindex.php?co=vysl&tab=easy
http://www.speedsudoku.com/public.php?mode=home&no_cookies=

Thanks @dp_94.
All the things you mentioned are really helpful in giving me a boost.


	@ 2016-03-19 11:21 AM (#21309) (#21309) Top
Vishal Posts: 22 Country : India	Vishal posted @ 2016-03-19 11:21 AM Anyone, please help me with this sudoku; I'm unable to proceed further I'm trying to attach the image file, but the attempt is getting failed again and again (file size is 37 KB) Edited by Vishal 2016-03-19 11:27 AM
	@ 2016-03-19 1:02 PM (#21310 - in reply to #21309) (#21310) Top
prasanna16391 Posts: 1801 Country : India	prasanna16391 posted @ 2016-03-19 1:02 PM Try uploading on an image hosting site and sharing the link.
	@ 2016-03-19 2:13 PM (#21311 - in reply to #21309) (#21311) Top
Vishal Posts: 22 Country : India	Vishal posted @ 2016-03-19 2:13 PM Here's the link to image: http://i68.tinypic.com/34r6mpv.jpg By the way, its LMI puzzle( Classic Set -C #132).
	@ 2016-03-19 2:42 PM (#21312 - in reply to #21311) (#21312) Top
kishy72 Posts: 419 Country : India	kishy72 posted @ 2016-03-19 2:42 PM Vishal - 2016-03-19 2:13 PM Here's the link to image: http://i68.tinypic.com/34r6mpv.jpg By the way, its LMI puzzle( Classic Set -C #132). 6 in R4C6 means a 6 in R1C4 or R3C4 which takes off a 6 from R8C4 .Hence for the 8th row,you have a pair (48)in R8C1 and R8C4 ---->R8C8 becomes a 6 .
	@ 2016-03-19 3:48 PM (#21313 - in reply to #21309) (#21313) Top
Vishal Posts: 22 Country : India	Vishal posted @ 2016-03-19 3:48 PM Not all possible pencil marks were there in previous image.... Here's the link to new image: http://i66.tinypic.com/6oipnp.jpg One more sudoku: link: http://i66.tinypic.com/2dpb2g.jpg Stuck in both the above sudoku...
	@ 2016-03-19 5:15 PM (#21314 - in reply to #21309) (#21314) Top
prasanna16391 Posts: 1801 Country : India	prasanna16391 posted @ 2016-03-19 5:15 PM For the first one, if 2 is in R5C1, it will have to be in C5 for both R4 and R9. So, 2 cannot be in R5C1.
	@ 2016-03-20 10:30 AM (#21316 - in reply to #21314) (#21316) Top
Vishal Posts: 22 Country : India	Vishal posted @ 2016-03-20 10:30 AM Thanks Prasanna I got what you're saying....but, I want to confirm that is that a logical way?? I mean, in this case one have to assume and deduce if 2 were to come in R2C1 then after 3-4 steps it would be a contradiction... Though I myself use the aforesaid technique but I'm not sure about its rationality.
	@ 2016-03-20 10:31 AM (#21317 - in reply to #21312) (#21317) Top
Vishal Posts: 22 Country : India	Vishal posted @ 2016-03-20 10:31 AM kishy72 - 2016-03-19 2:42 PM Vishal - 2016-03-19 2:13 PM Here's the link to image: http://i68.tinypic.com/34r6mpv.jpg By the way, its LMI puzzle( Classic Set -C #132). 6 in R4C6 means a 6 in R1C4 or R3C4 which takes off a 6 from R8C4 .Hence for the 8th row,you have a pair (48)in R8C1 and R8C4 ---->R8C8 becomes a 6 . Thanks Kishore
	@ 2016-03-23 6:10 PM (#21335 - in reply to #21317) (#21335) Top
Vishal Posts: 22 Country : India	Vishal posted @ 2016-03-23 6:10 PM Stuck here...anyone please guide through next steps.
	@ 2016-03-23 7:11 PM (#21336 - in reply to #21335) (#21336) Top
dp_94 Posts: 25 Country : India	dp_94 posted @ 2016-03-23 7:11 PM you made a mistake at R9C4 possible candidates should be 579 and 6 can not be there since 6 is already in that box but this sudoku also requires some advanced sudoku techniques like colouring, XYZ Wing,X-Y Chain. In Completion Even the world best sudoku solver's guess in such kind of puzzles they just wait a few seconds if they dont get any clue they just guess at that point some even guess multiple times. you can try this site for better understanding of these kind of advanced techniques http://www.sudokuwiki.org/sudoku.htm and these for practice http://www.mindoku.com/games http://www.sudokucup.com/ http://www.fed-sudoku.eu/enindex.php?co=vysl&tab=easy http://www.speedsudoku.com/public.php?mode=home&no_cookies=
	@ 2016-03-24 11:26 AM (#21338 - in reply to #21336) (#21338) Top
Vishal Posts: 22 Country : India	Vishal posted @ 2016-03-24 11:26 AM dp_94 - 2016-03-23 7:11 PM you made a mistake at R9C4 possible candidates should be 579 and 6 can not be there since 6 is already in that box but this sudoku also requires some advanced sudoku techniques like colouring, XYZ Wing,X-Y Chain. In Completion Even the world best sudoku solver's guess in such kind of puzzles they just wait a few seconds if they dont get any clue they just guess at that point some even guess multiple times. you can try this site for better understanding of these kind of advanced techniques http://www.sudokuwiki.org/sudoku.htm and these for practice http://www.mindoku.com/games http://www.sudokucup.com/ http://www.fed-sudoku.eu/enindex.php?co=vysl&tab=easy http://www.speedsudoku.com/public.php?mode=home&no_cookies= Thanks @dp_94. All the things you mentioned are really helpful in giving me a boost.