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Riad Khanmagomedov's April Contest — 11th to 19th April 2017
   LMI Tests -> Annual Competitions55 posts • Page 2 of 3 • 1 2 3
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-13 9:27 PM (#22812 - in reply to #22810) (#22812) Top


Moscow Puzzle Cup 2016 Author

Posts: 133
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Location: Russia
chaotic_iak - 2017-04-13 8:30 PM

To clarify about 12: if there is a loop passing through all cells in a region, the number of marks (or rather, penalty points) you get from that region is equal to the number of loops you have there; otherwise, it's the number of lines?

Edit: More questions.

For 10, the tiebreaker is the total number of letters used in all names?

For 7, a match head catches fire if any of the other cells sharing a side to it also catches fire?

For 5, half-dominoes may not occupy black cells even if the part covering the black cells are empty (no circles)?

12. Yes, number of loops/lines.
10. Maximize the number of names, using the least possible letters.
7. The head of the match lit from the flame in an adjacent cell (sharing a side).
5. The black cell should not be on half-domino.
yureklis
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-13 10:49 PM (#22813 - in reply to #22739) (#22813) Top


CTC & TVC Author & Organizer

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It has been so much time to not attempt to solve Riad's puzzles. Yesterday I solved nine of them and I had quite fun. Thanks Riad, really I missed your style.
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-14 1:09 PM (#22814 - in reply to #22813) (#22814) Top


Moscow Puzzle Cup 2016 Author

Posts: 133
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Location: Russia
yureklis - 2017-04-13 10:49 PM

It has been so much time to not attempt to solve Riad's puzzles. Yesterday I solved nine of them and I had quite fun. Thanks Riad, really I missed your style.

Thank you Serkan, I am very pleased and I'm glad to see you among the participants of April Contest!
forcolin
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-14 8:45 PM (#22815 - in reply to #22739) (#22815) Top





Posts: 156
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Location: Italy
For info. IUPAC has recently annouced the names (and symbols) of 4 new elements.

Nihonium and symbol Nh, for the element 113,
Moscovium and symbol Mc, for the element 115,
Tennessine and symbol Ts, for the element 117, and
Oganesson and symbol Og, for the element 118.

the new complete periodic table is available from [url] https://www.iupac.org/cms/wp-content/uploads/2015/07/IUPAC_Periodic_... [/url]

May be useful for the next contest.


Edited by forcolin 2017-04-14 8:46 PM
mstang
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-17 1:43 AM (#22827 - in reply to #22739) (#22827) Top





Posts: 47
2020
Location: USA
For #4 (build a circular maze), which direction are the digits going? Are they read outside to inside?
mstang
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-17 3:08 AM (#22828 - in reply to #22739) (#22828) Top





Posts: 47
2020
Location: USA
Also for #9 (Fleet between the pentominoes), how does the answer key work? It says "- or + or FILNPSTUVWXY" -- is "-" for no ship and "+" for ship and the letters for pentominoes?

Also I think there is a typo? J isn't a pentomino but N is. Or is that a different naming system?

Edited by mstang 2017-04-17 3:24 AM
Administrator
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-17 8:46 AM (#22829 - in reply to #22828) (#22829) Top


200050010010020
Location: India
mstang - 2017-04-17 3:08 AM

Also for #9 (Fleet between the pentominoes), how does the answer key work? It says "- or + or FILNPSTUVWXY" -- is "-" for no ship and "+" for ship and the letters for pentominoes?

Also I think there is a typo? J isn't a pentomino but N is. Or is that a different naming system?

J is used in this contest.


Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-17 2:16 PM (#22830 - in reply to #22827) (#22830) Top


Moscow Puzzle Cup 2016 Author

Posts: 133
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Location: Russia
mstang - 2017-04-17 1:43 AM

For #4 (build a circular maze), which direction are the digits going? Are they read outside to inside?

They are read outside to inside.
-.ferchx.-
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-18 1:40 AM (#22832 - in reply to #22739) (#22832) Top




Posts: 10

Location: Spain
Congratulations Riad. Excellent puzzles. Great fun!
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-18 1:54 PM (#22833 - in reply to #22832) (#22833) Top


Moscow Puzzle Cup 2016 Author

Posts: 133
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Location: Russia
-.ferchx.- - 2017-04-18 1:40 AM

Congratulations Riad. Excellent puzzles. Great fun!

Thank you Fernando!
Mihalich
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-18 10:52 PM (#22835 - in reply to #22739) (#22835) Top




Posts: 16

Location: Ukraine
Thank You, Riad! You have the usual, unusual puzzles - very interesting!
Good luck and new faery tasks!
Mihalich
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-19 11:40 AM (#22841 - in reply to #22739) (#22841) Top




Posts: 16

Location: Ukraine
?12. Esli sushchestvuet tol'ko odin put' obhoda belogo regiona (ne petlya!) - ehto dast tol'ko odno ochko?
Mihalich
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-19 12:06 PM (#22842 - in reply to #22739) (#22842) Top




Posts: 16

Location: Ukraine
#12. If there is only one way to bypass the white region (not loop!) - this will give only one point?
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-19 2:17 PM (#22844 - in reply to #22841) (#22844) Top


Moscow Puzzle Cup 2016 Author

Posts: 133
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Location: Russia
Mihalich - 2017-04-19 11:40 AM

?12. Esli sushchestvuet tol'ko odin put' obhoda belogo regiona (ne petlya!) - ehto dast tol'ko odno ochko?

Da, Vladimir, 1 ochko. Spasibo za otzyv! Zavtra uzhe mne predstoit serjozno potruditsja i proverit vse optimajzy.
Puzlifouk
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-19 3:33 PM (#22845 - in reply to #22739) (#22845) Top




Posts: 49
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Location: France
Hi Riad,
A great contest, as usual.
Just to be sure :
- For 8 Rollball :do WE choose the first direction of the ball, or this direction must be forced by the location of 3 walls around its initial position ? (I mean : is it admitted that less than 3 walls are around the initial position of the ball?)
For 11-Opti-Rollerball : can the ball finish scratched against a wall ?
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-19 6:06 PM (#22846 - in reply to #22845) (#22846) Top


Moscow Puzzle Cup 2016 Author

Posts: 133
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Location: Russia
Puzlifouk - 2017-04-19 3:33 PM

Hi Riad,
A great contest, as usual.
Just to be sure :
- For 8 Rollball :do WE choose the first direction of the ball, or this direction must be forced by the location of 3 walls around its initial position ? (I mean : is it admitted that less than 3 walls are around the initial position of the ball?)
For 11-Opti-Rollerball : can the ball finish scratched against a wall ?

Hi Puzlifouk (your real name is hidden and I cannot use it in Contests):
8. Around the starting positions may not be walls.
11. The ball cannot stay with diagonal walls - in this case the ball needs to keep moving.
Puzlifouk
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-19 7:30 PM (#22847 - in reply to #22739) (#22847) Top




Posts: 49
2020
Location: France
OK, Riad, thanks.
If you want to use it in a next contest, my first name is Nicolas :)
So for the 8, you confirm we choose the first direction of the ball, between saveral which are possible.
kiwijam
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-20 3:53 AM (#22849 - in reply to #22739) (#22849) Top




Posts: 147
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Location: New Zealand
Yes, you must choose the first direction for the ball to roll.
Administrator
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-20 5:14 AM (#22851 - in reply to #22739) (#22851) Top


200050010010020
Location: India

Optimizers


There were 46 submissions for puzzle 10 (WE WITH MENDELEEV), 37 for puzzle 11 (OPTI-ROLLBALL) and 33 for puzzle 12 (PENTOMINOES AND LINES). Like previous years, we have created a pdf file with all submissions.

Here is the link for the pdf.

auroux
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-20 7:48 AM (#22852 - in reply to #22739) (#22852) Top


Hex Slitherlink Author

Posts: 96
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Meh!! I had to enter my submission for #10 twice because of the two merged names in the initial version of the submission form & things didn't realign properly... but never checked that I forgot to enter 1 for Henna!!! Grrr... really annoying, esp. since it seems my solution was one of the optimal ones (105/561).

Anyway, it's my fault. But please, can we in the future avoid puzzles where submitting a solution is such a complicated process that requires filling a form with 140 entries in a user interface that was never meant for it? (esp. as, with Firefox on Linux at least, pressing Tab now moves forward by two form fields instead of one, so I keep skipping entries in LMI submission forms -- usually it's easy to spot a gap but in this case I guess it was above my double-checking abilities).

Denis
Kithyane
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-20 10:42 AM (#22853 - in reply to #22739) (#22853) Top




Posts: 27
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Location: France
Happy to see I got an optimal solution for #10, but frustrated that I failed at entering my answer correctly (typo in one number)... I have to agree with auroux, it was hellish to answer this one and very hard to check.

About #11, I'm really interested in the methods solvers used to optimize it, as I have no idea on how to do it properly.
Puzlifouk
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-20 12:33 PM (#22854 - in reply to #22739) (#22854) Top




Posts: 49
2020
Location: France
I have compassion, Denis and Anne (and others) but let's say that this problem was also a problem of checking technique: I spent a lot of time on this problem, because I wanted to be sure to get the best answer, and that it is valid: I hoped that the rule about the number of letters would be more discriminating ...
chaotic_iak
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-20 2:06 PM (#22855 - in reply to #22739) (#22855) Top



NEW, HUGE, AND CHALLENGING Author

Posts: 228
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Puzzles:
1. Interesting puzzle. At some points I have to bifurcate for quite some time; I wonder what the logical path is.
2. Very nice, if on the easier side of puzzles.
3. Basically Pencilmark Sudoku. Not particularly interesting, but that's probably because I don't like Sudoku in general.
4. Surprisingly once I got the idea how to do these Build A Maze puzzles, this one falls pretty easily.
5. One of the more interesting puzzles I've had. There's that satisfying a-ha moment when the dice falls and I can finally make progress.
6. Not particularly interesting, either; when a Nansuke puzzle gets past a certain point, it becomes a chore to look through the numbers to find one of satisfying pattern. I just coded a little program to help me find numbers matching a pattern I want. Given that I have to check quite a lot of patterns, I'm not sure if some other solution can shortcut it a lot.
7. Didn't solve; haven't gotten the break-in yet.
8. Didn't solve for the same reason.
9. Very nice idea, actually; this is one puzzle I enjoyed a lot.
10. A very bad idea for a puzzle, because you can actually program it and get the answer in reasonable amount of time (read: 2 seconds), without needing to check all configurations. (When I submitted this, I forgot there's the tiebreaker, but it can still be solved using program even so.)
11. Also a poor idea because theoretically it can still be solved pretty quickly (read: polynomial-time), although this time it won't be so fast. Although that's just me being lazy to think; I'm sure there's a way to get a fast enough program to find the optimal solution.
12. One of my favorite optimizers. Got the right idea, but couldn't figure out how to get one line only. I predicted the winning score to be 1 or 2; apparently there are so many of them.
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-20 2:39 PM (#22856 - in reply to #22739) (#22856) Top


Moscow Puzzle Cup 2016 Author

Posts: 133
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Location: Russia
I put the points for puzzles 11 and 12.
I and Deb discussed the post of Denis. The April Contest participants can check the answers twice, not in a hurry. I will consider offers of Denis in the future.
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-20 3:41 PM (#22857 - in reply to #22739) (#22857) Top


Moscow Puzzle Cup 2016 Author

Posts: 133
10020
Location: Russia
Preliminary results were published. Max scored seven participants. I congratulate Christian, Dmitry, Ken, Stefano, Takuma, Tomoaki and Tomoya!
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