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Administrator
   
Country : India | April Contest
This annual contest shall take place from 23-29 April 2021.
More details shall be shared in April 2021.
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Administrator
Country : India | Test duration
The test starts on [April 23] 1200 hrs Moscow Standard Time (GMT [April 23] 0900 hrs / IST [April 23] 1430 hrs).
Submissions close on [April 29] 2359 hrs Moscow Standard Time (GMT [April 29] 2059 hrs / IST [April 30] 0230 hrs ).
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Administrator
Country : India | |
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Administrator
Country : India | Some notes about April Contest 2021Please note this contest will have a slightly different format than regular LMI tests.
Key differences from regular LMI tests:
1. There is no IB (i.e. no Instructions Booklet). If you have any questions about any puzzle, please ask here in the forum.
2. The PB (Puzzle Booklet) does not have any password.
3. You can download the pdf and start solving. Login at the contest page and click on "Start test" to start submitting.
4. There is no time limit. You can submit until the contest ends.
5. There will be some optimizer puzzles. Other puzzles will be very hard (compared to regular LMI tests)
6. Same scores will have same rank (i.e. early submissions do not count towards rank)
Other important points:
7. There shall be no instant grading in this test.
8. There shall be no online solving interface (like penpa) provided for this test.
9. The score page shall be made available later.
10. There shall be 9 pages in the Puzzle Booklet.
11. Participants can submit answers any number of times. The last submission shall be considered for scoring.
12. There shall be no separate notification on submitting answers.
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pankh
Posts: 1
| pankh posted @ 2021-04-23 4:30 PM In Puzzle 8, Sudoku without sums, The sums in circles cannot be repeated on any shown line or in any 3x3 box. Does that mean that the number of circle should not match any number in the line or in 3x3 box? Or is it restricted only to the sums in circles? |
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Timjamiller
Posts: 54
Country : United States | For Opti-Names, can the same letter be used consecutively? For example, if a name was JERRY, would it require one R or two? |
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Riad Khanmagomedov
Posts: 234
Country : Russia | pankh - 2021-04-23 4:30 PM
In Puzzle 8, Sudoku without sums, The sums in circles cannot be repeated on any shown line or in any 3x3 box. Does that mean that the number of circle should not match any number in the line or in 3x3 box? Or is it restricted only to the sums in circles?
The sums in circles cannot be repeated on any shown line and the sums in circles cannot be repeated in any 3x3 box. |
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Riad Khanmagomedov
Posts: 234
Country : Russia | Timjamiller - 2021-04-23 6:42 PM
For Opti-Names, can the same letter be used consecutively? For example, if a name was JERRY, would it require one R or two?
You can take two letters R for one R. |
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kiwijam
Posts: 187
Country : New Zealand | kiwijam posted @ 2021-04-24 8:39 AM Hi Riad,
1. Sudokuscope: Is this correct?: a number cannot be the average of the two adjacent cells in the same ring, and cannot be the average of the two adjacent cells in the same sector.
Does the example have another solution? e.g. Horizontal line is 2143,2143, vertical line is (the same) 4231,4231.
2. Akari With Mirrors: Both sides of every mirror should be lit?
4. Bubbles: Does the example have another solution? e.g. The centre bubble can move one cell right.
7. Pentomining: The example shows the solution twice.
8. Sudoku Without Sums: I am checking that "shown line" means "black line". e.g. In the puzzle there is a circle in column 1, between rows 2 and 3. The sum in this circle must be different to (a) the two other circles in column 1, or (b) the four other circles between row 2 and row 3?
Thanks. |
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kheti
Posts: 30
Country : India | kheti posted @ 2021-04-24 9:39 AM Hi,
For the Sudoku with sums, the example solutions do not match the columns highlighted. 1st and 2nd column are highlighted but solution shows 1st and 4th column.
Thanks. |
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Riad Khanmagomedov
Posts: 234
Country : Russia | kiwijam - 2021-04-24 8:39 AM
Hi Riad,
1. Sudokuscope: Is this correct?: a number cannot be the average of the two adjacent cells in the same ring, and cannot be the average of the two adjacent cells in the same sector.
Does the example have another solution? e.g. Horizontal line is 2143,2143, vertical line is (the same) 4231,4231.
2. Akari With Mirrors: Both sides of every mirror should be lit?
4. Bubbles: Does the example have another solution? e.g. The centre bubble can move one cell right.
7. Pentomining: The example shows the solution twice.
8. Sudoku Without Sums: I am checking that "shown line" means "black line". e.g. In the puzzle there is a circle in column 1, between rows 2 and 3. The sum in this circle must be different to (a) the two other circles in column 1, or (b) the four other circles between row 2 and row 3?
Thanks.
Hi James,
1. In your solution, there is a region with a bold border that contains 2 twice.
2. Yes.
4. You're right, I'll fix the example.
7. Thanks, I'll fix the example.
8. Only (b ). |
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Riad Khanmagomedov
Posts: 234
Country : Russia | kheti - 2021-04-24 9:39 AM
Hi,
For the Sudoku with sums, the example solutions do not match the columns highlighted. 1st and 2nd column are highlighted but solution shows 1st and 4th column.
Thanks.
Thank you, I will correct the text. |
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Administrator
Country : India | Updated Puzzle Booklet
A new Puzzle Booklet has been published at 11:30 PM IST (9:00 PM Moscow Standard Time) on 24 April.
Changes:
1) Puzzle 4 - Example fixed
2) Puzzle 7 - Example fixed
8) Puzzle 8 - Example Answer key value corrected
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kheti
Posts: 30
Country : India | kheti posted @ 2021-04-26 12:04 AM For Akari with mirrors, are cells which the light from a lamp visits after reflecting from a mirror, also considered to be lit? The rule isn't very clear on this point.
Also, for half cells, do both sides of the mirror have to be lit or is it okay if only one side is lit?
Thanks,
Nikhil |
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kheti
Posts: 30
Country : India | kheti posted @ 2021-04-26 1:40 PM Hi,
For the Chain Puzzle (#9), some parts of a fragment are moving anti-clochwise in a circle and other parts are moving clockwise in another circle. For e.g., the red fragment of length 3 at the top left, it is moving anti-clockwise in the quarter of the top left circle and clockwise in the 2 quarters of the next circle.
How is the clockwise and anti-clockwise movement considered for this puzzle?
Thanks,
Nikhil |
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Swagatam
Posts: 45
Country : India | kheti - 2021-04-26 12:04 AM
For Akari with mirrors, are cells which the light from a lamp visits after reflecting from a mirror, also considered to be lit? The rule isn't very clear on this point.
Also, for half cells, do both sides of the mirror have to be lit or is it okay if only one side is lit?
Thanks,
Nikhil
Lamps lit the cells even after reflecting from a mirror.
For half cells, I considered both sides of a mirror has to be lit. |
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Riad Khanmagomedov
Posts: 234
Country : Russia | kheti - 2021-04-26 1:40 PM
Hi,
For the Chain Puzzle (#9), some parts of a fragment are moving anti-clochwise in a circle and other parts are moving clockwise in another circle. For e.g., the red fragment of length 3 at the top left, it is moving anti-clockwise in the quarter of the top left circle and clockwise in the 2 quarters of the next circle.
How is the clockwise and anti-clockwise movement considered for this puzzle?
Thanks,
Nikhil
It doesn't really matter. |
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kheti
Posts: 30
Country : India | kheti posted @ 2021-04-27 10:01 AM Hi Riad,
I am more concerned about the rule "When moving
clockwise, the lengths of these fragments must alternate in the sequence 1-2-3-1-2-3...1-2-3". How do I read when it is moving clockwise and when anti-clockwise?
Thanks,
Nikhil |
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Riad Khanmagomedov
Posts: 234
Country : Russia | kheti - 2021-04-27 10:01 AM
Hi Riad,
I am more concerned about the rule "When moving
clockwise, the lengths of these fragments must alternate in the sequence 1-2-3-1-2-3...1-2-3". How do I read when it is moving clockwise and when anti-clockwise?
Thanks,
Nikhil
Hi Nikhil,
You can simplify it: in one direction along the chain, the lengths of the fragments alternate in the sequence 1-2-3-1-2-3, and in the reverse 3-2-1-3-2-1... |
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kheti
Posts: 30
Country : India | kheti posted @ 2021-04-28 8:42 AM Thanks Swagatam. |
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kheti
Posts: 30
Country : India | kheti posted @ 2021-04-28 8:43 AM Thanks Riad |
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kheti
Posts: 30
Country : India | kheti posted @ 2021-04-28 6:37 PM Hi Riad,
For the chains puzzle (#9), is there a missing black dot on the shown fragment of the circle in row 6, column 5?
Most likely, I made a mistake somewhere and broke the puzzle but just wanted to check.
Thanks,
Nikhil |
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Administrator
Country : India | Contest Submissions
There will be no extension of the submission time for this contest.
Participants should ensure that the submissions are completed before 2400 hrs Moscow Standard Time on the 29th of April.
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Mihir Neve
Posts: 1
Country : India | Regarding the contest,
When I click on start, It says "The contest is inactive now, and the result will not be included in the official category"
Is this unusual or alright?
Thanks
Mihir |
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forcolin
Posts: 172
Country : ITALY | another great contest, thanks Riad |
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kiwijam
Posts: 187
Country : New Zealand | kiwijam posted @ 2021-04-30 4:53 AM Yes, thank you Riad for these great new ideas and interesting optimisers. (and that 14-point Sudoku was so hard!) |
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Administrator
Country : India | Optimizer SubmissionsSubmissions to Optimizer puzzles here. Puzzle 10 and 12 are not checked for uniqueness. If you notice any incorrect submissions, please help Riad by reporting them.
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SP1
Posts: 8
Country : Japan | SP1 posted @ 2021-04-30 11:30 AM Great contest, Riad!!!
After the contest, I found that there was an typo in my submit of P11......
(R4C5 N -> W) I'm so sorry about this error.
Edited by SP1 2021-04-30 12:00 PM
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Riad Khanmagomedov
Posts: 234
Country : Russia | SP1 - 2021-04-30 11:30 AM
Great contest, Riad!!!
After the contest, I found that there was an typo in my submit of P11......
(R4C5 N -> W) I'm so sorry about this error.
Thank you Takuma, Stefano, James and all the participants for the nice reviews!
OK, when checking, I inserted W instead of N.
Also, Mihailich wrote to me that in his answer to Puzzle 12, the black cell should be CP, not CI. I took note of that, too.
Edited by Riad Khanmagomedov 2021-04-30 4:17 PM
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Administrator
Country : India | Riad Khanmagomedov - 2021-04-30 4:16 PM
Also, Mihailich wrote to me that in his answer to Puzzle 12, the black cell should be CP, not CI. I took note of that, too.
There were similar problems for OlgaShut, Christian, Jo97 as well. Instead of column I, the black cell was put in column P. This is fixed now.
Updated link to Optimizer submissions |
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Mihalich
Posts: 26
Country : Ukraine | Address to the organizers of the answer form.
My decision on the puzzle 11 is gone! Decisions were sent several times and corrected, but in the end there was nothing left!
Please accept for consideration if possible my last submitted version
11. OPTI-NAMES 13 DZ1GLJ2 FUO1AT2 PH1V1I1N SC1X1E1M WYK1BR.
Edited by Mihalich 2021-04-30 7:18 PM
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Mihalich
Posts: 26
Country : Ukraine | Riad, thank you for a very interesting and powerful task!!!
Once again, your tasks are original again! |
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Riad Khanmagomedov
Posts: 234
Country : Russia | Mihalich - 2021-04-30 7:38 PM
Riad, thank you for a very interesting and powerful task!!!
Once again, your tasks are original again!
Thank you Vladimir,
All your answers are accepted and included in the updated booklet. |
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Riad Khanmagomedov
Posts: 234
Country : Russia | Preliminary results have been announced.
Congratulations to Takuma, Ken and James!
Edited by Riad Khanmagomedov 2021-04-30 8:01 PM
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SP1
Posts: 8
Country : Japan | SP1 posted @ 2021-04-30 8:30 PM Riad Khanmagomedov - 2021-04-30 4:16 PM
SP1 - 2021-04-30 11:30 AM
Great contest, Riad!!!
After the contest, I found that there was an typo in my submit of P11......
(R4C5 N -> W) I'm so sorry about this error.
Thank you Takuma, Stefano, James and all the participants for the nice reviews!
OK, when checking, I inserted W instead of N.
Also, Mihailich wrote to me that in his answer to Puzzle 12, the black cell should be CP, not CI. I took note of that, too.
Thank you Riad!
And I'm very happy to get 1st place!!! |
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sergi
Posts: 1
Country : Russia | sergi posted @ 2021-04-30 9:03 PM Is the best solution in puzzle 11 correct? |
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Riad Khanmagomedov
Posts: 234
Country : Russia | sergi - 2021-04-30 9:03 PM
Is the best solution in puzzle 11 correct?
I checked puzzles 10 and 12, and puzzle 11 was checked by the Deb program. Now I see that Christian repeated some letters in the solution. It is necessary to change the points, but this will not change the place in the top three.
Thank you for your comment!
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debmohanty
Country : India | Riad Khanmagomedov - 2021-05-01 12:14 AM
sergi - 2021-04-30 9:03 PM
Is the best solution in puzzle 11 correct?
I checked puzzles 10 and 12, and puzzle 11 was checked by the Deb program. Now I see that Christian repeated some letters in the solution. It is necessary to change the points, but this will not change the place in the top three.
Thank you for your comment!
Like Christian and panista, I also missed the rule that letters cannot be repeated. Have uploaded the revised submissions. |
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kiwijam
Posts: 187
Country : New Zealand | kiwijam posted @ 2021-05-01 7:51 AM Great optimizing solutions by Takuma and Nikola! |
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andsoldat
Posts: 1
Country : Russia | Puzzle Solutions please |
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Nikola
Posts: 103
Country : Serbia | Nikola posted @ 2021-05-02 12:25 AM Thank you Riad for keeping the continuity of the former Diogen contest, i miss it a lot. That was the time when I entered the puzzle world.
Thanks, James! The optimizers were sweet and small enough to start working again.
Congartualtions to the top solvers! |
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vjain9
Posts: 44
Country : India | vjain9 posted @ 2021-05-05 2:08 PM Enjoyed the tough puzzles. Please do share the Solutions please |
Riad Khanmagomedov's April Contest — 23rd to 29th April 2021