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 stuck in this sudoku | |
| LMI Essentials -> Solving Techniques | 159 posts • Page 3 of 7 • 1 2 3 4 5 6 7 |
prasanna16391 |
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2021 World Sudoku+Puzzle Convention Organizer Posts: 1809    Location: India | |||
| purzelbaumfan |
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Thank you. I have managed to solve some other puzzles of the "extreme" level. Now I tried a "hardcore" one and I can't get any further. I don't even know where to start a chain! What do you say?  Edited by purzelbaumfan 2013-04-03 11:34 PM | |||
| motris |
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Posts: 199  Location: United States | |||
| purzelbaumfan |
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| kishy72 |
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SM 2020 (Math) Author Posts: 419 Location: India | With the Sudoku Caravan moving next to the UK and then the US in a short notice i thought it would be appropriate now to get the unworked worked out.So after a bit of an exile from this stuck forum (which was more self imposed) i m back to being stuck again .So this is going to be the first of the three 'Big Fish sudokus' that i m going to post.This movable digits sudoku looked like a fun puzzle to solve until the point i got stuck from where it became suddenly 'immovable' and made me to call it quits.So fellas can you find the continuation and shw the way to me?  Edited by kishy72 2013-04-25 8:40 PM | ||
| Para |
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Posts: 315 Location: The Netherlands | |||
| kishy72 |
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SM 2020 (Math) Author Posts: 419 Location: India | Hi !!Thnks for the nice tip .I was able to proceed from there till here.I see that this stage is ripe for a bifurcation where the numbers will rapidly fall in place after that but i was looking for the logical continuation and the right line of thinking has eluded me for close to 45mins from this point.How do i continue from here?!  Edited by kishy72 2013-04-27 11:26 PM | ||
| caudmont |
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| kishy72 |
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SM 2020 (Math) Author Posts: 419 Location: India | Thnks .But i got stuck again in the same sudoku just after placing the 4s in first 3 rows and 7s in first 2 rows.I am not going to waste everyone's time by posting that sudoku once more.I would greatly appreciate a spoiler though again from that stage. Time to move on to the next one.I have completed the 108 point killer after a torturous grind.So this little killer would be the last i would be posting from the serb grand prix and i hope that i dont get clueless multiple times just like the previous.Excepting a few deductions i was unable to make much of a start here.Applause to all those who have completed this.  Edited by kishy72 2013-05-02 7:04 PM | ||
| kishy72 |
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SM 2020 (Math) Author Posts: 419 Location: India | kishy72 - 2013-05-02 7:04 PM A better pic?!Not able to get the resolution that i want.  Edited by kishy72 2013-05-02 8:08 PM | ||
| prasanna16391 |
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2021 World Sudoku+Puzzle Convention Organizer Posts: 1809 Location: India | |||
| kishy72 |
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SM 2020 (Math) Author Posts: 419 Location: India | Tripod sudoku from the recently concluded Turkey round .I had no idea on how to go about it during the test.But after completing the test i paid closer attention to the rules and did a bit of scrutiny to see if i could gain anything meaningful from the rules and i did.Since all points where 3 lines meet are given , it hit me that either 2 lines are shaded or only one is shaded in the plus (+) that surrounds each dot.So some slitherlink kind of work let me to this stage from where i could not continue further.Since this Tripod sudoku is present in the Italian round too i am interested to see how it works.So fellas how do i continue and are there any general rules to keep in mind while solving this variant(I dont want to be stuck again)  Edited by kishy72 2013-06-26 9:32 PM | ||
| prasanna16391 |
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2021 World Sudoku+Puzzle Convention Organizer Posts: 1809 Location: India | |||
| kishy72 |
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SM 2020 (Math) Author Posts: 419 Location: India | prasanna16391 - 2013-06-26 9:44 PM kishy72 - 2013-06-26 9:32 PM Tripod sudoku from the recently concluded Turkey round .I had no idea on how to go about it during the test.But after completing the test i paid closer attention to the rules and did a bit of scrutiny to see if i could gain anything meaningful from the rules and i did.Since all points where 3 lines meet are given , it hit me that either 2 lines are shaded or only one is shaded in the plus (+) that surrounds each dot.So some slitherlink kind of work let me to this stage from where i could not continue further.Since this Tripod sudoku is present in the Italian round too i am interested to see how it works.So fellas how do i continue and are there any general rules to keep in mind while solving this variant(I dont want to be stuck again) Quick note that might help - Tripod isn't toroidal, so you can basically draw the outer square in it's entirety, which will give you few more "crosses" between cells, using the all tripods marked rule.  Nice.Thnks a lot!I think i can complete it now. | ||
| deepika m |
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 Pls help me in solving this sudoku. | |||
| debmohanty |
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 Location: India | There is an xy-wing in box4 and box7. In simple terms, it means you can rule out one of the two possibilities at R4C1. Note that you have some unmarked pencil marks at R7C3 and R8C1.  | ||
| deepika m |
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| prasanna16391 |
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2021 World Sudoku+Puzzle Convention Organizer Posts: 1809 Location: India | I was actually about to post this just before Deb posted the XY-Wing thing. Anyway, here's how I would've solved it (and something I'm able to spot more easily) - A 3 in R3C2 means it has to be in R7C3. A 2 in R3C1 means it has to be in R7C3. So both of these can't be true, so 4's in R3C2. I generally don't know names of the techniques I use, I just use them  | ||
| kishy72 |
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SM 2020 (Math) Author Posts: 419 Location: India | Dynasty sudoku from the US sudoku Team Qualification created by Wei Hwa hwang aka onigame.I have always had difficulty solving sudokus with a puzzle element attached to them .I find these kind of sudokus to be sort of a 'speed breaker' since they greatly reduce my solving pace.....So where is the continuation in here?!(Rules : 1-7 and 2 shaded cells in each row,column and Box.Shaded cells don't touch orthogonally.White cells have to be connected)  Edited by kishy72 2014-05-13 8:19 PM | ||
| swaroop2011 |
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PR 2020 (Shading and Loops) Author Posts: 668 Location: India | |||
| kishy72 |
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SM 2020 (Math) Author Posts: 419 Location: India | Hiii Swaroop!Thanks a lot!Pretty sound reasoning indeed!But don't you think that the deduction is a bit too lengthy for comfort and borders a bit more on guess work.I doubt whether someone could visualize that far without putting pen to paper.Well a few maybe?!Surely there must be some cutthroat logic from where I got stuck to proceed further. To illustrate my point take a look at this Triomino sudoku from the Japanese Grand Prix round. Rules: Place a digit from 1 to 6 into each empty cell or blacken the cell so that each digit appears exactly once in every row, column, and outlined 3x3 region along with three black cells. Each black cell should be part of an orthogonally connected group of three blackened cells (a triomino). No two triominoes can share an edge. As I see ,you can proceed further by taking a guess ,lets say at R4C4 assuming it to be a shaded cell which leads to the following ---->1 at R4C9,1 at R6C6----->Shaded cells at R5C9,R6C9,R6C8---->6 at R6C7---> shaded cell at R8C7--->2 in R8C6(you can't have a shaded cell because if you do you won't get 3 shaded cells in Box 9 (which are part of a triomino))--->2 in R5C4,5 in R5C5 --->Shaded cells in R1C6,R7C6 and R9C6(only cells in that column)---->shaded cells in R9C5 and R9C4(to get a triomino) and at last a contradiction since you get 4 shaded cells in Box 8.Phew!So you can't have a shaded cell at R4C4 and you proceed beyond after that. But do you think there is a better way without going the earlier path that I stated.There is a much stronger contination indeed!Look at cells R7C1 and R7C2 .These cells must contain atleast one shaded cell.So there cannot be a shaded cell in R9C2 because if there is, then you would have 4 shaded cells in Box 7 which violates the rule.So R9C2 must be a number and cannot be anything except a 5 and from where the sudoku proceeds like knife through butter!!This is where I feel ,the top solvers differentiate themselves from the rest.It was not before spending a lot of time that I managed to get a 5 at R9C2.So it is something like this that I would be mighty interested to know in the earlier Dynasty sudoku. ----Kishore----  Edited by kishy72 2014-05-15 9:00 PM | ||
| swaroop2011 |
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PR 2020 (Shading and Loops) Author Posts: 668 Location: India | |||
| rakesh_rai |
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Mean Minis (2020) Author Posts: 774 Location: India | |||
| swaroop2011 |
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PR 2020 (Shading and Loops) Author Posts: 668 Location: India | |||
| ka_bharath |
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| Could you please help me in proceeding with this 6x6 sudoku. The numbers in black are givens and the ones in green is what I have entered. I am unable to proceed further. Thanks, Bharath  Edited by ka_bharath 2014-07-02 7:43 PM | |||
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