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PR 2020 (Shading and Loops) Author
Posts: 668
  
Location: India | can any body help out for how to start the "crossnumber sudoku and number 5 still alive"?
not getting a start. |
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Posts: 315
Location: The Netherlands | For the crossnumber sudoku, you basically just have to place all numbers in the grid first. The most obvious point to start, is the left bottom corner. The left bottom vertical number, you can relatively easily prove that only 5876 is possible there, considering the numbers that can cross and the fact no digits can repeat within nonet 7. Once you have that, you should be able to fill ou the whole crossword.
Number 5 still alive I haven't figured out yet myself.
purifire - 2011-07-14 9:06 AM
I can only speculate why this particular point structure has been chosen, but I like it. I have always believed Sudoku to be a "Single Persons Chess" where just solving is not important but strategising too. In this point structure, it would be foolish to tackle puzzles in order of appearance. A little bit of strategy would be needed as to how and in which order the puzzles would be attacked.
I don't really agree but I guess that's not a discussion to have here.
I mainly was just inquiring with what solving time this test was intended for the fastest solvers (as that is normally what the test length is for), to get an idea on the difficulty and thus how to approach this test. Because I was under the impression that the time extension/point reduction system was intended so that the people who finish just behind the fastest solvers can also finish all puzzles in competition for once, just for less points. Would still appreciate an answer from someone who knows for sure. |
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PR 2020 (Shading and Loops) Author
Posts: 668
Location: India | thanks para.
actually i forget considering a sudoku rule. i considered it as solving like a crossword puzzle with few guesses but forgotten the basic rule. now i will give it another strike.
"just one cell sudoku"- how to go about it. i could just get few things in the top right corner 3 x 3. but not able to get that answer '2' . can anybody give the explanation for it.
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Posts: 315
Location: The Netherlands | Just one cell sudoku:
R469C7 is a hidden triple {135}. Now R1C7 is a hidden single 2. Or you could do R28C7 is a naked pair {79} for C7, now R1C7 is a naked single 2. |
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Posts: 199
Location: United States | The Number 5 Still Alive example from WSC2 was notoriously difficult and much much much more difficult than the competition puzzle was. This, in my experience, is often the case with Vlad Portugalov puzzles where the "example" is too hard to solve. After 15 minutes, I can explain how to get just 9 sure digits and 2 labeled pairs.
My hope is that someone can give you a link to another Number 5 Still Alive type puzzle from a previous mock test. I can only quickly find the related Number X is Alive puzzle from the May Sudoku test at the moment. |
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Diagonal Vision Author
Posts: 337
Location: Switzerland | motris - 2011-07-14 11:49 PM
The Number 5 Still Alive example from WSC2 was notoriously difficult and much much much more difficult than the competition puzzle was. This, in my experience, is often the case with Vlad Portugalov puzzles where the "example" is too hard to solve. After 15 minutes, I can explain how to get just 9 sure digits and 2 labeled pairs.
My hope is that someone can give you a link to another Number 5 Still Alive type puzzle from a previous mock test. I can only quickly find the related Number X is Alive puzzle from the May Sudoku test at the moment.
There was one "number 5 still alive" on fed-sudoku. It was 1rst grid of "killer IV" of krtek's cup. you need to login to see the grid, the archives are not updated.
But the rule was a bit different, as "number in one cage should be different" applied there.
Fred |
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Location: India | Para - 2011-07-14 10:17 PM
I mainly was just inquiring with what solving time this test was intended for the fastest solvers (as that is normally what the test length is for), to get an idea on the difficulty and thus how to approach this test. Because I was under the impression that the time extension/point reduction system was intended so that the people who finish just behind the fastest solvers can also finish all puzzles in competition for once, just for less points. Would still appreciate an answer from someone who knows for sure.
Serkan has mentioned to me how much time he expects a top solver would take to complete all sudokus, so I obviously know the answer
But since he didn't answer the post yet, I'm not sure if he wants to make it public before the test ends.
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Location: India | rakesh_rai - 2011-07-13 9:18 PM
For a particular sudoku, I submit a correct answer at 65 minutes. Then I think something is wrong, so I change the answer and submit an incorrect answer at 75 minutes. But, in the end, I again realize my mistake and re-submit the correct answer at 119 minutes. The puzzle is worth 100 points.
How many do I get - 100 or 50?
As done in all other tests, your last submission (from online or paper mode) will be considered as the only valid answer.
We don't check intermediate submissions. So you get 50.
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Location: India | About "Number 5 Still Alive"
Serkan and Cihan did a contest just before WSC2007 - It had Number 5 Still Alive (and also Crossnumber, Distance) - Here is the link http://www.otuzoyun.com/puzzles/PseudokuChampionship.pdf
Any idea why it is called "Number 5 Still Alive". Is it based on some movie or song name? |
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Location: India | motris - 2011-07-14 11:49 PM
The Number 5 Still Alive example from WSC2 was notoriously difficult and much much much more difficult than the competition puzzle was. This, in my experience, is often the case with Vlad Portugalov puzzles where the "example" is too hard to solve. After 15 minutes, I can explain how to get just 9 sure digits and 2 labeled pairs.
Interestingly, a Google search on < "number 5 still alive" Sudoku > throws up a link which has the actual puzzle in the competition.
Some more examples at http://forsmarts.com/pdf/fpb_05.pdf
As noted in IB (like what Fred mentioned), in the puzzle in this competition "digits may repeat in the cages". |
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Mean Minis (2020) Author
Posts: 774
Location: India | 1] For online mode, will the rows/columns be automatically marked from the start, or will we need to click on "show cells to fill" 21 times?
2] For offline mode, how do we fill the answer key for "Just One Cell sudoku"? Just the number or the cell notation too? For online mode, I presume we just need to fill the key cell and click on submit. |
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Posts: 89
Location: India | I think the name could be fall out of puzzles like XV and kropki where 5 cannot be derived from cell where clues are given... just a wild thought
Edited by utkaarsh 2011-07-15 1:33 PM
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Location: India |
D1 - Musketry Sudoku will have 2 diagonals marked. These diagonals are 12-cells long. All other puzzles will have a combination of 2 rows / columns marked. See note below for E4 - Just One Cell Sudoku
Online Solvers
1) The order of Sudokus will be exactly same as in IB, except that D2 will appear before D1.
2) E4 - Just One Cell Sudoku - You must fill exactly one digit in the grid. If multiple digits are filled in the grid while submitting, you won't get any points. It is okay to have pencil marks around the grid (you don't need to clear the pencil marks before submitting)
Paper Solvers
1) The password protected puzzle booklet has 12 pages. There is no cover page. D1 and E5 appear on single pages. All other pages have 2 puzzles each
2) E4 - Just One Cell Sudoku - The answer format is "Co-ordinate of the cell, followed by the digit in the cell" e.g. EN3 (No special characters, you enter exactly 2 letters and one digit). See image below for co-ordinate system.
3) Paper solvers who don't want the grids to be loaded in their browser can use this link - http://logicmastersindia.com/M201107S/?paper=1
As usual, players are free to choose the mode of solving (paper or online or mixed). Your last submitted answer and its timestamp will be considered for scoring.
Point claims for typos will not be accepted, unless the typo is on a given digit.
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Posts: 148
Location: France | debmohanty - 2011-07-15 6:17 AM
Any idea why it is called "Number 5 Still Alive". Is it based on some movie or song name?
It is almost certainly referring to the movie "Short circuit". |
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Special 8 Author
Posts: 12
Location: ITALY | number 5 still alive is known to be very tricky. It is based on a principle that you can apply to "classic killer" sudoku. That is, you just have to add-up the unit digits, forgetting about the tens. The leftovers, together with the known areas, have to sum up ?5. For example, if your dotted areas show the digits: ?4, ?3, ?1 the sum is ?8. Any leftover cell or group of cells must end up with ?7, as ?8+?7 is ?5.
That is, because you want the sum to be 45, so it must end with a 5.
Like this, in the number 5 still alive, all of the areas have ?5, so the sum can either be ?5 or ?0, letting you figure out what the leftovers can be. |
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Location: India | Puzzle booklet uploaded and flash submission enabled. |
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Location: India | Score page is now enabled - http://logicmastersindia.com/M201107S/score.asp
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Posts: 3
Location: Poland | Great contest!
Time limit was perfectly fixed. Also very good points distribution , maybe besides Just One Cell - it took me at most 5 seconds. ;)
The best puzzle constructions: Numeral, Double Diagonal, Termometer, Number 5, Killer.
Congratulations to You, Serkan. |
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Posts: 199
Location: United States | Very beautiful puzzles Serkan; in many places your puzzles were even better than the respective ones from the WSC. Thanks for writing these. |
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Posts: 315
Location: The Netherlands | Thanks for the puzzles Serkan.
I just checked the results again and I seem to have lost points (only realised as I switch places with xevs). I think my Numeral Sudoku Entry went from 65% to 50%. I was pretty sure I submitted my last 2 puzzles in the 65% and 50% zone, not both in the 50% zone. This was how it was listed before. Why did it change? |
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Special 8 Author
Posts: 12
Location: ITALY | Checklist of possible mistakes in this competition:
1) Completing a puzzle, but sending only half solution [DONE]
2) Printing the Outside Sudoku on a recycled paper, so that some numbers are covered with other prints [DONE]
3) Printing the Thermometer Sudoku in low-quality [DONE]
4) Completing the row and column for the solution, then continue finishing the sudoku, and seeing the time runnig over just when you're pasting on the submission page [DONE]
5) Completing the Just One Cell in just three seconds, and spending one minute to check whether it is REALLY correct [DONE]
6) Leaving the Double Diagonal for last [DONE]
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Diagonal Vision Author
Posts: 337
Location: Switzerland | Gabrieleud - 2011-07-16 9:20 PM
Checklist of possible mistakes in this competition:
1) Completing a puzzle, but sending only half solution [DONE]
2) Printing the Outside Sudoku on a recycled paper, so that some numbers are covered with other prints [DONE]
3) Printing the Thermometer Sudoku in low-quality [DONE]
4) Completing the row and column for the solution, then continue finishing the sudoku, and seeing the time runnig over just when you're pasting on the submission page [DONE]
5) Completing the Just One Cell in just three seconds, and spending one minute to check whether it is REALLY correct [DONE]
6) Leaving the Double Diagonal for last [DONE]
I just forgot to submit one answer (a grid solved between 70th and 90th minutes) 
I don't mention other misadventure that happened to me during the test (1rst one was a power cut - that lasted 50 minutes - just at the beginning of the test, when my printer hadn't finished to print. Fortunately, I didn't choose to play all test online, and my printer had enough time to print enough grids...)
Fred |
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Diagonal Vision Author
Posts: 337
Location: Switzerland | But, I agree with others: GREAT SET OF PUZZLES !
 Serkan ! |
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Posts: 69
Location: Japan | Really good test! Thanks, Serkan.
The only thing I regret is that I completely lost concentration in the last 30 minutes and broke some puzzles. |
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Posts: 328
Location: India | Grt test.......
One submission blunder............typed Y instead of X in B1 Classic in last digit in the column key. Hope it can be considered as an typo.
[Deb edited the digits] |
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