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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: 1784
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: 1784
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: 1784
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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Posts: 1
Location: United States | For the Bubbles Puzzle (Puzzle 2), do bubbles have to circle completely around an NxN (N=1,2,3) square of cells, or can a bubble of "size 3" only circle 3 of the leftmost cells while the center of the bubble is outside the grid? |
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Moscow Puzzle Cup 2016 Author
Posts: 234
Location: Russia | auroux - 2023-04-17 8:54 PM
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 ?
You can't break the expression wherever you want. If you write down your expressions many times in a row (or read in a circle an infinite number of times), then you should get the right equality. In the example , you can write 68=45_PLUS_23=68=45_PLUS_23=68= etc. |
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Moscow Puzzle Cup 2016 Author
Posts: 234
Location: Russia | auroux - 2023-04-17 8:59 PM
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).
The circle is used in the construction of letter palindromes, which are read an infinite number of times clockwise and counterclockwise, but sometimes giving different phrases. In Russia, such constructions are called cyclodromes. |
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Hex Slitherlink Author
Posts: 145
Location: France | Riad Khanmagomedov - 2023-04-17 11:06 AMYou can't break the expression wherever you want. If you write down your expressions many times in a row (or read in a circle an infinite number of times), then you should get the right equality. In the example , you can write 68=45_PLUS_23=68=45_PLUS_23=68= etc.
Ok, thanks. But, uh, wait. Now I am concerned. Is there, then, a requirement to have at least two equal signs?
Otherwise, something like '98765*43210=' around the circle produces a valid equality when reading around the circle infinitely many times: 98765*43210=98765*43210=98765*43210=...
But this seems to violate the spirit of the puzzle, or at least there isn't much optimization left to do in this version.
And for completeness, can you clarify what exactly you expect in the answer key? The example given for the answer format only has one = sign given for each direction, even though there are two reading around the circle, so do we answer by giving what you get by cutting the circle open at an '=' sign and reading everything from just after that '=' sign to just before it, but not including the '=' sign along which we cut?
Sorry to be picky about details, but I think people spending time on this puzzle want to make sure that they are working on the correct version of it...
Thanks,Denis |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1784
Location: India | jeff10 - 2023-04-17 9:26 PM
For the Bubbles Puzzle (Puzzle 2), do bubbles have to circle completely around an NxN (N=1,2,3) square of cells, or can a bubble of "size 3" only circle 3 of the leftmost cells while the center of the bubble is outside the grid?
The former. |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1784
Location: India | A new puzzle booklet has been uploaded to address some of the issues discussed in the previous page (puzzle 9 wording and puzzle 2 example's key) |
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Moscow Puzzle Cup 2016 Author
Posts: 234
Location: Russia | auroux - 2023-04-18 12:21 AM
Riad Khanmagomedov - 2023-04-17 11:06 AMYou can't break the expression wherever you want. If you write down your expressions many times in a row (or read in a circle an infinite number of times), then you should get the right equality. In the example , you can write 68=45_PLUS_23=68=45_PLUS_23=68= etc.
Ok, thanks. But, uh, wait. Now I am concerned. Is there, then, a requirement to have at least two equal signs?
Otherwise, something like '98765*43210=' around the circle produces a valid equality when reading around the circle infinitely many times: 98765*43210=98765*43210=98765*43210=...
But this seems to violate the spirit of the puzzle, or at least there isn't much optimization left to do in this version.
And for completeness, can you clarify what exactly you expect in the answer key? The example given for the answer format only has one = sign given for each direction, even though there are two reading around the circle, so do we answer by giving what you get by cutting the circle open at an '=' sign and reading everything from just after that '=' sign to just before it, but not including the '=' sign along which we cut?
Sorry to be picky about details, but I think people spending time on this puzzle want to make sure that they are working on the correct version of it...
Thanks,Denis
You must have 2, 3 or more equal signs. You can also get the equality 1 = 3-2 = 5-4 = with three equal signs and write it out endlessly in a circle. But at the same time, in the opposite direction, it must also be true. |
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Hex Slitherlink Author
Posts: 145
Location: France | Ok thank you! Now it is clear. |
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Moscow Puzzle Cup 2016 Author
Posts: 234
Location: Russia | auroux - 2023-04-18 11:40 AM
Ok thank you! Now it is clear.
It is allowed to use arithmetic signs on both sides of the equal sign. |
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