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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1780
   
Location: India |
This annual contest shall take place from 16-23 April 2023.
More details shall be shared in subsequent posts soon.
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1780
Location: India | |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1780
Location: India | Some notes about April Contest 2023Please note this contest will have a slightly different format than regular LMI tests.
Key differences from regular LMI tests:
1. There is no IB (i.e. no Instructions Booklet). If you have any questions about any puzzle, please ask here in the forum.
2. The PB (Puzzle Booklet) does not have any password.
3. You can download the pdf and start solving. Login at the contest page and click on "Start test" to start submitting.
4. There is no time limit other than the 1 week duration. You can submit until the contest ends.
5. There will be some optimizer puzzles. Other puzzles will be very hard (compared to regular LMI tests)
6. Same scores will have same rank (i.e. early submissions do not count towards rank)
Other important points:
7. There shall be no instant grading in this test.
8. There shall be no online solving interface (like penpa) provided for this test.
9. The score page shall be made available later.
10. There shall be 10 pages in the Puzzle Booklet.
11. Participants can submit answers any number of times. The last submission shall be considered for scoring.
12. There shall be no separate notification on submitting answers.
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Posts: 44
Location: India | Puzzle booklet yet to be uploaded ? Timer has started though ! |
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Hex Slitherlink Author
Posts: 145
Location: France | Now that the contest has started, is the puzzle booklet coming soon? |
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Posts: 67
Location: France | Hi everybody,
What is going on with this contest? It seems open, but without a puzzle booklet, it is effectively closed. And the messages in the discussion thread are not readable, even when you are logged in. Can we have some information? |
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Posts: 7
Location: South Korea | still+no+booklet.... |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1780
Location: India | Note: Sorry about the puzzle booklet. I missed a command that shows it. Its up now. I'll extend the contest end by a day to compensate. |
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Posts: 67
Location: France | Hello again. For puzzle 9 (Open road): Do you confirm not all double cells must have a one-half shaded? |
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Hex Slitherlink Author
Posts: 145
Location: France | For+puzzle+2%2c+the+answer+key+of+the+example+seems+wrong+(should+be+WWWIW). |
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Location: India | I confirm the other way: all double cells must have one half shaded and the other used. |
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Location: India | Auroux: You are right. The answer key for example 2 is wrong and there should be an I instead of an L. |
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Posts: 67
Location: France | OK! So that means half shaded cell may touch a shaded cell, at least diagonally!
In fact, my initial problem was that I inderstood ths conditions as :
- all double cells must have a shaded half and an unshaded half;
- all shaded cells and all shaded half of double cells do not touch.
But these two conditions cannot both be verified. If they were, this creates problem around the magenta and the lemon M.
So I have a new question: if a shaded half of a double celle can touch a shaded cell (or another shaded half of a double cell), is it necessarily diagonally, or can it also be orthogonally? Am I clear? |
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Location: India | Shaded cells cannot touch orthogonally. They can touch diagonally. (This is for puzzle 9) |
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Posts: 67
Location: France | Administrator - 2023-04-16 7:43 PM
Shaded cells cannot touch orthogonally. They can touch diagonally. (This is for puzzle 9)
OK Thanks. The puzzle booklet says something else ("The shaded cells do not touch, not even diagonally"). It will be corrected, I suppose ... |
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Location: India | Yes we will get it corrected soon. |
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Location: India |
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Posts: 67
Location: France | Hello. New question about problem 10. What is the order of priority of the operations? Are the operations performed in the order they are found or do multiplication (X) and division (/) have priority? In other words, do we have 9-6/3=(9-6)/3=1 or 9-6/3=9-(6/3)=7? |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1780
Location: India | The rules say "without parenthesis" which means they are performed in the order they are found. |
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Posts: 6
Location: France | %5BQUOTE%5D8%2E+There+shall+be+no+online+solving+interface+%28like+penpa%29+provided+for+this+test%2E%5B%2FQUOTE%5D%0D%0A%0D%0AAre+we+still+allowed+to
E%5B%2FQUOTE%5D%0D%0A%0D%0AAre+we+still+allowed+to+use+penpa+to+copy+the+puzzles+and+solve+them+if+we%27re+more+confortable+with+it%3F%0D%0A%0D%0AAlso
e%27re+more+confortable+with+it%3F%0D%0A%0D%0AAlso%2C+to+what+extent+are+we+allowed+to+use+calculators+and+other+programs%3F+I%27m+guessing+the+line+i
rs+and+other+programs%3F+I%27m+guessing+the+line+is+drawn+at+something+like+%22only+what+you+could+do+on+windows%27+calculator+app%22+or+%22no+calcula
o+on+windows%27+calculator+app%22+or+%22no+calculators+allowed+period%22%0D%0A%0D%0AI+couldn%27t+find+any+clear+ruleset+for+this+contest%2C+if+there+a
d+any+clear+ruleset+for+this+contest%2C+if+there+are+i+would+like+to+know+where+it+is+%F0%9F%98%8A
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Moscow Puzzle Cup 2016 Author
Posts: 234
Location: Russia | Puzlifouk - 2023-04-17 11:50 AM
Hello. New question about problem 10. What is the order of priority of the operations? Are the operations performed in the order they are found or do multiplication (X) and division (/) have priority? In other words, do we have 9-6/3=(9-6)/3=1 or 9-6/3=9-(6/3)=7?
9-6/3=7. The priority of operations is standard. |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1780
Location: India | prasanna16391 - 2023-04-17 2:36 PM
The rules say "without parenthesis" which means they are performed in the order they are found.
Sorry, guess I was a bit wrong here, please follow what Riad says. |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1780
Location: India | %5BQUOTE%5DBarbitos+%2D+2023%2D04%2D17++6%3A11+PM%0D%0A%0D%0AAre+we+still+allowed+to+use+penpa+to+copy+the+puzzles+and+solve+them+if+we%27re+more+conf
py+the+puzzles+and+solve+them+if+we%27re+more+confortable+with+it%3F%0D%0A%0D%0AAlso%2C+to+what+extent+are+we+allowed+to+use+calculators+and+other+pro
nt+are+we+allowed+to+use+calculators+and+other+programs%3F+I%27m+guessing+the+line+is+drawn+at+something+like+%22only+what+you+could+do+on+windows%27+
hing+like+%22only+what+you+could+do+on+windows%27+calculator+app%22+or+%22no+calculators+allowed+period%22%0D%0A%0D%0AI+couldn%27t+find+any+clear+rule
iod%22%0D%0A%0D%0AI+couldn%27t+find+any+clear+ruleset+for+this+contest%2C+if+there+are+i+would+like+to+know+where+it+is+%F0%9F%98%8A%5B%2FQUOTE%5D%0D%
to+know+where+it+is+%F0%9F%98%8A%5B%2FQUOTE%5D%0D%0A%0D%0ARedrawing+on+Penpa+is+fine%2E+There+is+no+rule+against+using+calculators+and+other+programs%
rule+against+using+calculators+and+other+programs%2C+but+the+contest+was+intended+to+be+done+without+them%2E+I+suppose+your+line+is+a+good+line+to+dra
+them%2E+I+suppose+your+line+is+a+good+line+to+draw%2E+
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Hex Slitherlink Author
Posts: 145
Location: France | On puzzle 10, does a circular equality loop "all around" with equal signs separating equal terms (in particular there must be at least two = signs), or do we get to "break the circle" where we want (not necessarily at an equality sign, and not necessarily in the same place in both directions) to form equalities that can be read clockwise or counterclockwise?
Concretely, if for some digits A,B,C,D,E one had the identities A_PLUS_BC=DEF and ED=CB_PLUS_AF, where the latter can be formed by writing the former around a circle, cutting in a different place, and reading in the other direction, would this be a valid solution ? Or is the only legal way to write the identity A_PLUS_BC=DEF to actually write "A_PLUS_BC=DEF=" around the circle (with an extra equal sign) and both expressions must be formed by cutting the circle at an "=" sign ?
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Hex Slitherlink Author
Posts: 145
Location: France | After more thinking, I assume the correct interpretation is that we can break the circle anywhere we want (not necessarily at an = sign, and not necessarily in the same place in both directions), and that the example I gave would be a valid solution. Otherwise, it would have been easier to state the problem as producing an equality which is valid when read forwards and backwards (no need to use a circle). |
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WSPC 2017 • Schedule • Participation • Location • WSC • WPC • Contact •Search •Recent
Riad Khanmagomedov's April Contest — 16th to 23nd April 2023
