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Neighbours - 12th-14th Sep - Sudoku Mahabharat & ISC Qualifier | |

LMI Tests -> Sudoku Mahabharat | 79 posts • Page 1 of 4 • 1 2 3 4 |

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Location: India | Link for rules and other details about Sudoku Mahabharat : http://logicmastersindia.com/SM/2015-16.asp Instructions for Neighbours - http://logicmastersindia.com/SM/201509/ | ||

Administrator |
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Location: India | ## NeighboursInstruction Booklet for Neighbours published.Link : http://logicmastersindia.com/SM/201509/ | ||

prasanna16391 |
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PR 2020 (Evergreens) Author Posts: 1414 Location: India | Practice links - Touchy and Renban are repeated from last year's Sudoku Mahabharat Neighbours round - http://logicmastersindia.com/lmitests/?test=SM201502 Thermo is basically 'Inequality in series', so that is technically a repeat too. Either way, Thermo Sudoku is very common and a search of any blogs on the LMI links page should get some results - http://logicmastersindia.com/home/?g=links . Renban and Quadruple should also be somewhat common on blogs and sites. Quadruple is a repeat from last year, but from the Standard variations round. http://logicmastersindia.com/lmitests/?test=SM201409 Repeated Neighbours has appeared in Sudoku Grand Prix Indian round in 2013 and 2014. There is a 'pairs' logic to this variant which really helps solve it. It a mix of Neighbours & Converse so could have been on either round. One hint is to compare it to Untouch Sudoku. http://logicmastersindia.com/lmitests/?test=M201302S http://gp.worldpuzzle.org/content/wpf-sudoku-gp7 If you are feeling really adventurous, then try this one from my blog, but be warned, it took even some of the world's best solvers upwards of 20 minutes. The competition one will definitely be much easier :) https://prasannaseshadri.wordpress.com/2013/07/23/puzzle-no-415-repe... | ||

mihiryadav |
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Posts: 27 Location: INDIA | In repeated neighbours....can there be two pairs of repeating neighbours?...and can a neighbour repeat thrice? | ||

Administrator |
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Location: India | mihiryadav - 2015-09-08 12:39 PM In repeated neighbours....can there be two pairs of repeating neighbours?...and can a neighbour repeat thrice? Neighbours in this puzzle refer to Orthogonal (i.e. sharing an edge) neighbours. So it can't repeat thrice. But there can be two pairs of repeating neighbours. | ||

Administrator |
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Location: India | ## Points TableInstruction Booklet is re-uploaded with points table. Here it is for your quick reference. | ||

mihiryadav |
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Posts: 27 Location: INDIA | How to proceed ahead? | ||

prasanna16391 |
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PR 2020 (Evergreens) Author Posts: 1414 Location: India | mihiryadav - 2015-09-11 1:37 PM How to proceed ahead? Not sure what this is in reference to. Can you specify? You mean Repeated Neighbours? | ||

Administrator |
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Location: India | ## Quadruple SudokuMinor change in rules of "Quadruple Sudoku"Apply standard Sudoku rules. Additionally, the digits given at the corner must appear in the 4 adjoining cells. If any digit is given twice, it must appear twice. See example below: Instructions booklet is updated with this rule. | ||

lrani |
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Posts: 24 Location: India | There is no doubt on the updated rule. I was thinking that in a Quadruple sudoku always 4 numbers will be given as clues to be filled in the 4 adjoining cells. In the example which is updated above less than 4 nos are given as clues to be filled in the adjoining cells. Pls confirm. | ||

devarajand |
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Posts: 113 Location: India | Pl detail the rules of Repeated Neighbours and updated rule of Quadruple. | ||

debmohanty |
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Location: India | lrani - 2015-09-11 5:37 PM There is no doubt on the updated rule. I was thinking that in a Quadruple sudoku always 4 numbers will be given as clues to be filled in the 4 adjoining cells. In the example which is updated above less than 4 nos are given as clues to be filled in the adjoining cells. Pls confirm. Yes, the new example having less than 4 numbers is intentionally given. The Sudoku(s) in the contest will have clues like this. | ||

debmohanty |
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Location: India | devarajand - 2015-09-11 5:37 PM Pl detail the rules of Repeated Neighbours and updated rule of Quadruple. Repeated Neighbours : Note that here Neighbours means "orthogonal neighbours" i.e. cells sharing an edge. So, one cell can have maximum 4 orthogonal neighbours. Among those 4 neighbouring cells, if any two cells have same digit, then the original cell will be shaded. Converse rule applies i.e. a) all possible shaded cells are marked. b) a white cell must have different digits in the 4 neighbouring cells. Quadruple : Note sure how to elaborate this. The rule is pretty clear and the new example shows all possible cases. If any particular sentence is not clear in the rule, please highlight that and we will re-word, if possible. | ||

debmohanty |
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Location: India | If any rule is not clear, please refer to the solution... Also please solve the examples in the IB to be absolutely clear about the rules before the contest starts. The last thing you want to do after you start the timer is to understand the rules :) | ||

Himanshi |
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Posts: 3 Location: India | I am really confused with respect to Repeated Neighbours. Can you please elaborate with the help of a diagram as to what does sharing an edge means. ( The way Anti Knight Sudoku is explained) In 6x6 sudoku, the same digits are repeated diagonally in the shaded cells. But in 9x9 sudoku, I find digits repeating diagonally with respect to some white cells, for eg. 9 is repeating in R2C3 & R3C4, 7 is repeating in R6C3 & R7C2 and R3C6 & R4C5 etc and not for shaded cells Edited by Himanshi 2015-09-11 7:09 PM | ||

prasanna16391 |
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PR 2020 (Evergreens) Author Posts: 1414 Location: India | Himanshi - 2015-09-11 6:54 PM I am really confused with respect to Repeated Neighbours. Can you please elaborate with the help of a diagram as to what does sharing an edge means. ( The way Anti Knight Sudoku is explained) In 6x6 sudoku, the same digits are repeated diagonally in the shaded cells. But in 9x9 sudoku, I find digits repeating diagonally with respect to some white cells, for eg. 9 is repeating in R2C3 & R3C4, 7 is repeating in R6C3 & R7C2 and R3C6 & R4C5 etc and not for shaded cells The rule doesn't mean that digits in shaded cells will repeat. The digit in a shaded cell is irrelevant for that cell, it means (at least) two cells around that cell will have repeating digits. So in the 6x6 that is forced to be in a shaded cell but the way to look at it in there is, for R2C3, R2C4 and R3C3 are repeating among the 4 cells around it, so R2C3 is shaded. Since R2C3 and R3C4 are also repeating, R2C4 and R3C3 are shaded because for both of those cells, a digit is repeating in the 4 cells around them. | ||

debmohanty |
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Location: India |
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Himanshi |
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Posts: 3 Location: India | Thanks a lot Prasanna and Deb Mohanty. Your explanations have helped a lot, specially with the diagram. Just to confirm " a can never be = c" and " b can never be = d" | ||

debmohanty |
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Location: India | Himanshi - 2015-09-11 9:31 PM You are right. We will be violating Classic Sudoku rules if a =c or if b = d.Just to confirm " a can never be = c" and " b can never be = d" | ||

Himanshi |
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Posts: 3 Location: India | Oops just didnt thought over it, was so confused on the entire things. Anyways thanks a lot :) | ||

piyush99 |
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Posts: 2 Location: India | I am not able to get a start for the repeated neighbours sudoku (6*6). Can anyone plz help? | ||

prasanna16391 |
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PR 2020 (Evergreens) Author Posts: 1414 Location: India | piyush99 - 2015-09-11 11:13 PM I am not able to get a start for the repeated neighbours sudoku (6*6). Can anyone plz help? See the image above and ask yourself this - if X is shaded, to accommodate any combination of repeating letters, wouldn't you need another shaded cell nearby, considering that white cells cannot have repeating neighbours? | ||

piyush99 |
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Posts: 2 Location: India | Yeah done. Thanks | ||

PuzzleScott |
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Posts: 42 Location: USA | In touchy sudoku, is it just clue digits that require a consecutive neighbor? Or is it every digit in the full solution? | ||

debmohanty |
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Location: India | PuzzleScott - 2015-09-12 4:18 AM Every digit in the full solution.In touchy sudoku, is it just clue digits that require a consecutive neighbor? Or is it every digit in the full solution? | ||

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