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Riad Khanmagomedov's April Contest — 11th to 19th April 2017
   LMI Tests -> Annual Competitions55 posts • Page 1 of 3 • 1 2 3
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-13 1:44 PM (#22808 - in reply to #22806) (#22808) Top


Moscow Puzzle Cup 2016 Author

Posts: 158
1002020
Location: Russia
kiwijam - 2017-04-13 4:04 AM

"And the songs that I have sung..."

Hi Riad, some 'easy' questions (just to clarify):
11 OPTI-ROLLBALL: We can place a maximum of 3 triangles in the grid?
11 OPTI-ROLLBALL: The path cannot repeat in an infinite loop, so "M14W" is not allowed?
11 OPTI-ROLLBALL: You can enter the start cell again (at 90 degrees), so "K17Z" is 11.5 points?
12 PENTOMINOES AND LINES: We must place all 12 pentominoes in the grid (so placing only 11 is not valid)?
12 PENTOMINOES AND LINES: In every white region, it is possible to visit every cell with a single line. So a white region in the shape of a T-pentomino is not valid?
12 PENTOMINOES AND LINES: If a region has 2 possible loops (e.g. a white 4x3 rectangle), then it gets 'many many' points?

Hi James,
11. You can place a maximum of 3 triangles in the grid, but may be less, such as 2, 1 or 0.
The path cannot repeat in an infinite loop (“echo in the distance” will not help).
The start cell can be crossed again (at 90 degrees).
12. You must place all 12 pentominoes in the grid.
In every white region, it is possible to visit every cell with a single line. A white region in the shape of a T-pentomino is not valid.
If a region has 2 possible loops (e.g. a white 4x3 rectangle), then it gets 2 points. I should have been clearer to say about it in the text.
auroux
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-13 8:21 PM (#22809 - in reply to #22739) (#22809) Top


Hex Slitherlink Author

Posts: 112
100
Location: France
Argh. The goal in 12 is to *minimize* the total score!! Just spent many hours trying to maximize it...
chaotic_iak
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-13 8:30 PM (#22810 - in reply to #22739) (#22810) Top



Typed Logic Author

Posts: 241
1001002020
Location: Indonesia
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)?

Edited by chaotic_iak 2017-04-13 8:36 PM
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: 158
1002020
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

Posts: 183
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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: 158
1002020
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: 166
100202020
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: 67
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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: 67
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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


20001000100
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: 158
1002020
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: 12

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: 158
1002020
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: 22
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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: 22
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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: 22
20
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: 158
1002020
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: 55
2020
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: 158
1002020
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: 55
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: 161
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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


20001000100
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: 112
100
Location: France
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: 40
2020
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: 55
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 ...
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