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Riad Khanmagomedov's April Contest — 11th to 19th April 2017
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Administrator
Subject: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-05 6:55 AM (#22739) (#22739) Top


200010020



forcolin
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-06 2:42 PM (#22742 - in reply to #22739) (#22742) Top





Posts: 118
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looking forward to this
auroux
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-11 8:20 AM (#22781 - in reply to #22739) (#22781) Top


Hex Slitherlink Author

Posts: 85
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Confused -- the timer on the page now says it starts in 49 days ???
debmohanty
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-11 9:25 AM (#22782 - in reply to #22781) (#22782) Top



Test Co-ordinator

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auroux - 2017-04-11 8:20 AM

Confused -- the timer on the page now says it starts in 49 days ???
Sorry about that, corrected now.
Administrator
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-11 9:26 AM (#22783 - in reply to #22739) (#22783) Top


200010020

Some notes about April Contest

Please note this contest has a slightly different format than regular LMI tests.

Key differences from regular LMI tests:
• There is no IB (i.e. no Instructions Booklet). If you have any questions about any puzzle, please ask here.
• The PB (Puzzle Booklet) does not have any password
• You can download the pdf and start solving. Login at the contest page to start submitting.
• There is no time limit. You can submit until the contest ends.
• There will be some optimizer puzzles. Other puzzles will be very hard (compared to regular LMI tests)
• Same scores will have same rank (i.e. early submissions do not count towards rank)

Administrator
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-11 9:27 AM (#22784 - in reply to #22739) (#22784) Top


200010020

April Contest has started (Link)

• Puzzle booklet (without password) is available.
• This thread will remain open (unrestricted) throughout the contest - which will allow players to ask questions about the puzzles.
• The red warnings for optimizer puzzles are not always correct. You can ignore them, if you are fairly sure that your answer keys are in correct format;
• If you notice that red warnings are not correct for other puzzles, please post about them here.


forcolin
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-11 3:02 PM (#22786 - in reply to #22739) (#22786) Top





Posts: 118
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Location: Italy
believe there is a typo in puzzle 9. the text says the ships are 10 but the figure shows 15. please clarify
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-11 7:09 PM (#22787 - in reply to #22786) (#22787) Top


Moscow Puzzle Cup 2016 Author

Posts: 104
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Location: Russia
forcolin - 2017-04-11 3:02 PM

believe there is a typo in puzzle 9. the text says the ships are 10 but the figure shows 15. please clarify

Hi Stefano, 15 ships as shown, thank you for the clarification!
Fred76
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-11 7:11 PM (#22788 - in reply to #22787) (#22788) Top



Diagonal Vision Author

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The only sudoku is named nonsudoku !!!
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-11 9:17 PM (#22789 - in reply to #22788) (#22789) Top


Moscow Puzzle Cup 2016 Author

Posts: 104
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Location: Russia
Fred76 - 2017-04-11 7:11 PM

The only sudoku is named nonsudoku !!!

The charm of the English translation
Perhaps we should use a hyphen. But the name was approved in preparation for the September Sudoku Contest.
Administrator
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 6:14 AM (#22793 - in reply to #22739) (#22793) Top


200010020
forcolin
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 6:46 AM (#22794 - in reply to #22739) (#22794) Top





Posts: 118
100
Location: Italy
Sorry but the instructions of puzzle 11 OPTI BALL are unclear to me. Getting old. Need help.
I notice the puzzle is similar to puzzle 8 and perhaps this may induce misunderstanding.
first question.The instructions say that I can put up to 3 right angled triangles in any cell except the start. I can see how to put ONE triangle. I can see how to put TWO triangles (for example A and D) turning a white cell into a black one. But I cannot see how I can put 3 triangles. please explain
Second question: can the ball conclude its route leaving the grid, as in puzzle 8? Or it must stay within the grid at all time, and can only conclude its path against a wall (similar to Tiger in the wood)? Are both options possible?
Third question: What do you mean with the sentence "The ball cannot return back"? I assume the path of the ball can cross itself in an empty white square as in the puzzle 8, and this sentence is not forbidding this, please confirm
mstang
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 7:57 AM (#22796 - in reply to #22739) (#22796) Top




Posts: 14

Location: USA
Can I submit an answer twice or more if I find an error in a solution?
Administrator
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 8:41 AM (#22797 - in reply to #22796) (#22797) Top


200010020
mstang - 2017-04-12 7:57 AM

Can I submit an answer twice or more if I find an error in a solution?
You can submit as many times as you want. We will consider only the final submission. Also, there is no penalty for wrong submissions.
kiwijam
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 8:59 AM (#22798 - in reply to #22739) (#22798) Top




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Location: New Zealand
Excellent timing, just right to keep me busy over the 4-day weekend here. :)
forcolin
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 4:14 PM (#22800 - in reply to #22739) (#22800) Top





Posts: 118
100
Location: Italy
There is an error in the answer page for puzzle 10. Two names (LAM/LAURA) share he same box
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 4:54 PM (#22801 - in reply to #22794) (#22801) Top


Moscow Puzzle Cup 2016 Author

Posts: 104
100
Location: Russia
forcolin - 2017-04-12 6:46 AM

Sorry but the instructions of puzzle 11 OPTI BALL are unclear to me. Getting old. Need help.
I notice the puzzle is similar to puzzle 8 and perhaps this may induce misunderstanding.
first question.The instructions say that I can put up to 3 right angled triangles in any cell except the start. I can see how to put ONE triangle. I can see how to put TWO triangles (for example A and D) turning a white cell into a black one. But I cannot see how I can put 3 triangles. please explain
Second question: can the ball conclude its route leaving the grid, as in puzzle 8? Or it must stay within the grid at all time, and can only conclude its path against a wall (similar to Tiger in the wood)? Are both options possible?
Third question: What do you mean with the sentence "The ball cannot return back"? I assume the path of the ball can cross itself in an empty white square as in the puzzle 8, and this sentence is not forbidding this, please confirm

1. I showed might look like the answer. It implies that the 3 triangles do not need to put in one cell. The triangles in the example were in cells H1, H0, K3.
2. Both are possible. This is the only difference between the puzzle 8 and 11.
3. The ball can cross any cell twice, but could not bounce back 180 degrees from a fully black square, that is, the path cannot overlap itself.
Administrator
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 7:45 PM (#22802 - in reply to #22800) (#22802) Top


200010020
forcolin - 2017-04-12 4:14 PM

There is an error in the answer page for puzzle 10. Two names (LAM/LAURA) share he same box

Fixed. Please refresh the submission page.
forcolin
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 7:46 PM (#22803 - in reply to #22739) (#22803) Top





Posts: 118
100
Location: Italy
I said I am getting old......

Edited by forcolin 2017-04-12 8:07 PM
forcolin
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 8:53 PM (#22804 - in reply to #22739) (#22804) Top





Posts: 118
100
Location: Italy
With reference to puzzle 12: how much is the score of a line of cell with a unique path but not forming a loop? (for example a group of 3 cells)
Riad Khanmagomedov
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-12 9:10 PM (#22805 - in reply to #22804) (#22805) Top


Moscow Puzzle Cup 2016 Author

Posts: 104
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Location: Russia
forcolin - 2017-04-12 8:53 PM

With reference to puzzle 12: how much is the score of a line of cell with a unique path but not forming a loop? (for example a group of 3 cells)

1 mark.
You remind me a hit of Deep Purple, which I played the guitar: "But I feel I'm growing older..."
kiwijam
Subject: Re: Riad Khanmagomedov's April Contest — 11th to 19th April 2017 @ 2017-04-13 4:04 AM (#22806 - in reply to #22739) (#22806) Top




Posts: 110
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Location: New Zealand
"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?
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: 104
100
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: 85
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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



NEW, HUGE, AND CHALLENGING Author

Posts: 191
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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
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