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Typed Logic Author
Posts: 241
 
Location: Indonesia | In 11 can the ball cross its own path? |
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Posts: 102
Location: United States | In 12, is it a requirement to use all pentominoes (i.e. should K always be 8)? If not, should the formula be 2L - K?
Otherwise we are penalized for using more pentominoes, and clearly the more pentominoes, the harder it is to have few black cells. |
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Moscow Puzzle Cup 2016 Author
Posts: 238
Location: Russia | chaotic_iak - 2018-04-04 9:20 AM
In 11 can the ball cross its own path?
No. |
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Moscow Puzzle Cup 2016 Author
Posts: 238
Location: Russia | ghirsch - 2018-04-04 12:11 PM
In 12, is it a requirement to use all pentominoes (i.e. should K always be 8)? If not, should the formula be 2L - K?
Otherwise we are penalized for using more pentominoes, and clearly the more pentominoes, the harder it is to have few black cells.
K is not necessarily equal to 8. Minimize K + 2L. |
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Location: India | Updated PB
An updated Puzzle Booklet is now available.
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Posts: 102
Location: United States | Riad Khanmagomedov - 2018-04-03 2:31 PM
ghirsch - 2018-04-04 12:11 PM
In 12, is it a requirement to use all pentominoes (i.e. should K always be 8)? If not, should the formula be 2L - K?
Otherwise we are penalized for using more pentominoes, and clearly the more pentominoes, the harder it is to have few black cells.
K is not necessarily equal to 8. Minimize K + 2L.
Wouldn't the optimal thing trivially be to just use no pentominoes? You can make a loop through all the cells if they are all white, so K and L would both be 0.
I feel like I must be missing something.
Edited by ghirsch 2018-04-05 7:32 AM
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Typed Logic Author
Posts: 241
Location: Indonesia | I think the missing thing is that the solution to 12 must be unique. It should be added to the PB.
Edited by chaotic_iak 2018-04-05 7:38 AM
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Typed Logic Author
Posts: 241
Location: Indonesia | More questions:
3: For the purposes of lawns, each diagonal segment is of the same length as horizontal/vertical segments? Also, can you go diagonally through a white cell, without any lawn next to you?
4: Can names repeat in the grid?
8: For the cells without slashes, the clues point to the longer direction (the direction with more than 1 cell)? Is it possible to make it more similar to Kakuro, so each square is slashed? |
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PR 2020 (Casual and Word) Author
Posts: 349
Location: India | Riad Khanmagomedov - 2018-04-04 1:21 PM
chaotic_iak - 2018-04-04 9:20 AM
In 11 can the ball cross its own path?
No.
So this translates to - each half white and fully white cell needs to be visited exactly once?
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Moscow Puzzle Cup 2016 Author
Posts: 238
Location: Russia | chaotic_iak - 2018-04-05 7:38 AM
I think the missing thing is that the solution to 12 must be unique. It should be added to the PB.
The loop must be unique! |
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Moscow Puzzle Cup 2016 Author
Posts: 238
Location: Russia | chaotic_iak - 2018-04-05 7:49 AM
More questions:
3: For the purposes of lawns, each diagonal segment is of the same length as horizontal/vertical segments? Also, can you go diagonally through a white cell, without any lawn next to you?
4: Can names repeat in the grid?
8: For the cells without slashes, the clues point to the longer direction (the direction with more than 1 cell)? Is it possible to make it more similar to Kakuro, so each square is slashed?
3. Yes.
4. No.
8. Yes, to the longer direction. |
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Moscow Puzzle Cup 2016 Author
Posts: 238
Location: Russia | amitsowani - 2018-04-05 9:56 AM
Riad Khanmagomedov - 2018-04-04 1:21 PM
chaotic_iak - 2018-04-04 9:20 AM
In 11 can the ball cross its own path?
No.
So this translates to - each half white and fully white cell needs to be visited exactly once?
The white cell can be crossed twice. The path should not overlap with itself. |
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Classics & Regions (PR 2016/17) Author
Posts: 170
Location: Germany | For the solution code to puzzle 3, would a diagonal of length 2 be counted as 2 (it's two unit diagonals) or as 0 (it's not a unit diagonal)? |
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Sudoku Grand Prix - Turkish Round Author
Posts: 34
Location: Turkey | 11. Rollball variation.
- The ball goes through the centres of all white half cells and all fully white cells. So does it go through all current white cells, or can some of white cells be completely blackened by adding triangles?
- "The ball can roll out of the grid or stay inside the grid" Does this sentence refer to the end of the route?
Edited by bskbri 2018-04-06 3:58 AM
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Moscow Puzzle Cup 2016 Author
Posts: 238
Location: Russia | rob - 2018-04-06 12:16 AM
For the solution code to puzzle 3, would a diagonal of length 2 be counted as 2 (it's two unit diagonals) or as 0 (it's not a unit diagonal)?
The diagonal of length 2 is counted as 2. |
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Moscow Puzzle Cup 2016 Author
Posts: 238
Location: Russia | bskbri - 2018-04-06 3:57 AM
11. Rollball variation.
- The ball goes through the centres of all white half cells and all fully white cells. So does it go through all current white cells, or can some of white cells be completely blackened by adding triangles?
- "The ball can roll out of the grid or stay inside the grid" Does this sentence refer to the end of the route?
1. First you need to blacken some cells. Then through all the remaining white cells and half cells draw the route.
2. Yes, the end of the route. |
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Typed Logic Author
Location: Australia | The answer format checker for Rollball Variation rejects lists of triangles which have (a) triangle(s) in column 10.
Edited by boboquack 2018-04-07 7:10 AM
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CTC & TVC Author & Organizer
Posts: 183
Location: Turkey | Riad Khanmagomedov - 2018-04-05 1:40 PM
amitsowani - 2018-04-05 9:56 AM
Riad Khanmagomedov - 2018-04-04 1:21 PM
chaotic_iak - 2018-04-04 9:20 AM
In 11 can the ball cross its own path?
No.
So this translates to - each half white and fully white cell needs to be visited exactly once?
The white cell can be crossed twice. The path should not overlap with itself.
I don’t get it, can the road cross itself or not? Because your first answer is “No”, and the second one is “Yes”. Did you mean that a horizontal road segment and a vertical road segment can cross on a fully white cell? Are we talking about the 2017 April’s Opti-Roll puzzle; the road act same in here about crossing? |
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Posts: 1
Location: Germany | Riad Khanmagomedov - 2018-04-03 3:21 PM
Para - 2018-04-03 7:00 PM
For 10. Does minimum mean the amount of digits or the sum of their values?
For 11. Can you place a black triangle in a given cell with a triangle to turn it into a fully black cell?
10. Minimize the sum by using fewer digits.
11. Yes.
Questions for 11:
Could one also place two triangles in an entirely white cell, turning it entirely black?
And if so, would you name the two trinagles as A and D or as B and ?
Also, in what order are the tringales to be given in the solution code? If it's in order of the path (as the example seems to imply) then where/how would one put in the triangles creating a full black cell, as the path doesn't visit them ?
Edited by Joe Average 2018-04-07 4:29 PM
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Location: India | Updated PB
An updated Puzzle Booklet is now available. The word "unique" is added to Puzzle #12
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Posts: 69
Location: Japan | I'd like to know when this test will end.
PB mentions "not later than 24-00 (of Moscow time) April 11 2018", but the timer in the submission page indicates 24 hours before that. |
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Moscow Puzzle Cup 2016 Author
Posts: 238
Location: Russia | yureklis - 2018-04-07 2:10 PM
Riad Khanmagomedov - 2018-04-05 1:40 PM
amitsowani - 2018-04-05 9:56 AM
Riad Khanmagomedov - 2018-04-04 1:21 PM
chaotic_iak - 2018-04-04 9:20 AM
In 11 can the ball cross its own path?
No.
So this translates to - each half white and fully white cell needs to be visited exactly once?
The white cell can be crossed twice. The path should not overlap with itself.
I don’t get it, can the road cross itself or not? Because your first answer is “No”, and the second one is “Yes”. Did you mean that a horizontal road segment and a vertical road segment can cross on a fully white cell? Are we talking about the 2017 April’s Opti-Roll puzzle; the road act same in here about crossing?
I understand the question as it is translated the translator. If the issue was not the word "own", I understood it clearly. The path can intersect itself (the fully white cell can be crossed twice), but the path should not overlap with itself. |
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Moscow Puzzle Cup 2016 Author
Posts: 238
Location: Russia | Joe Average - 2018-04-07 4:16 PM
Riad Khanmagomedov - 2018-04-03 3:21 PM
Para - 2018-04-03 7:00 PM
For 10. Does minimum mean the amount of digits or the sum of their values?
For 11. Can you place a black triangle in a given cell with a triangle to turn it into a fully black cell?
10. Minimize the sum by using fewer digits.
11. Yes.
Questions for 11:
Could one also place two triangles in an entirely white cell, turning it entirely black?
And if so, would you name the two trinagles as A and D or as B and ?
Also, in what order are the tringales to be given in the solution code? If it's in order of the path (as the example seems to imply ) then where/how would one put in the triangles creating a full black cell, as the path doesn't visit them ?
It's possible. The order in the solution code is arbitrary. |
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Moscow Puzzle Cup 2016 Author
Posts: 238
Location: Russia | deu - 2018-04-08 8:35 AM
I'd like to know when this test will end.
PB mentions "not later than 24-00 (of Moscow time) April 11 2018", but the timer in the submission page indicates 24 hours before that.
As in the PB. |
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Posts: 12
Location: Spain | For 11:
It's possible N=0?
Then a route with lenght=2 and N=0, i.e., is better that other with lenght= 40 and N=1?
Edited by -.ferchx.- 2018-04-08 6:25 PM
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WSPC 2017 • Schedule • Participation • Location • WSC • WPC • Contact •Search •Recent
Riad Khanmagomedov's April Contest — 3rd to 11th April 2018
