PR 2026 R4 - Shading & Loops (10th - 17th Apr) Score Discuss
Riad's April Contest 2026 (19th - 28th April) has started Discuss
World Sudoku & Puzzle Championship 2026
Riad Khanmagomedov's April Contest — 19th to 28th April 202621 posts • Page 1 of 1 • 1
@ 2026-04-15 4:34 AM (#39344) (#39344) Top

prasanna16391



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prasanna16391 posted @ 2026-04-15 4:34 AM



This annual contest shall take place from 19-28 April 2026.
More details shall be shared in subsequent posts soon.
@ 2026-04-15 4:36 AM (#39345 - in reply to #39344) (#39345) Top

prasanna16391



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prasanna16391 posted @ 2026-04-15 4:36 AM

Some notes about April Contest 2026

Please 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 when the contest starts and start solving. Login at the contest page and click on "Start test" to start submitting.
4. There is no time limit other than the 10 day duration. 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 online solving interface (like penpa) provided for this test.
8. The score page shall be made available later.
9. There shall be 10 pages in the Puzzle Booklet.
10. Participants can submit answers any number of times. The last submission shall be considered for scoring.
11. There shall be no separate notification on submitting answers.
@ 2026-04-19 7:58 AM (#39433 - in reply to #39344) (#39433) Top

professorX



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professorX posted @ 2026-04-19 7:58 AM

At what time will the contest start?
@ 2026-04-19 9:29 AM (#39434 - in reply to #39433) (#39434) Top

Administrator



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Administrator posted @ 2026-04-19 9:29 AM

professorX - 2026-04-19 7:58 AM

At what time will the contest start?


Oh my bad, thought the header was up. It starts at noon India time.
@ 2026-04-19 11:59 AM (#39435 - in reply to #39344) (#39435) Top

Administrator



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Administrator posted @ 2026-04-19 11:59 AM

The Puzzle Booklet is now available. Good luck to all participants!
@ 2026-04-19 12:55 PM (#39436 - in reply to #39344) (#39436) Top

Administrator



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Administrator posted @ 2026-04-19 12:55 PM

The marked rows in puzzle 5 were shifted, this is fixed in the latest Puzzle Booklet. If they are pointing in between two columns, download the puzzle booklet again.
@ 2026-04-19 2:15 PM (#39437 - in reply to #39344) (#39437) Top

kiwijam



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kiwijam posted @ 2026-04-19 2:15 PM

Admin: Please make this thread non-restricted.
@ 2026-04-19 2:25 PM (#39438 - in reply to #39344) (#39438) Top

kiwijam



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kiwijam posted @ 2026-04-19 2:25 PM

#6 Azure and Rose Journey: Can the line visit the start or end points two times? e.g. we leave the start point with an azure segment, and later we pass through this point again with a long rose segment.
#12 Azure and Rose Optimum: Same question.
@ 2026-04-19 2:29 PM (#39439 - in reply to #39344) (#39439) Top

shedarshian



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Country : China

shedarshian posted @ 2026-04-19 2:29 PM

In the first puzzle, does the "overlap" in "may intersect or overlap" means that one orthogon completely contains another?
@ 2026-04-19 2:30 PM (#39440 - in reply to #39437) (#39440) Top

prasanna16391



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prasanna16391 posted @ 2026-04-19 2:30 PM

kiwijam - 2026-04-19 2:15 PM

Admin: Please make this thread non-restricted.


I think there is utility in keeping it restricted in case someone wants to verify their solution following the rules, or comment on a solve path - unrestricting individual posts is easy, just a button.
@ 2026-04-19 3:42 PM (#39441 - in reply to #39438) (#39441) Top

Riad Khanmagomedov



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Riad Khanmagomedov posted @ 2026-04-19 3:42 PM

kiwijam - 2026-04-19 2:25 PM

#6 Azure and Rose Journey: Can the line visit the start or end points two times? e.g. we leave the start point with an azure segment, and later we pass through this point again with a long rose segment.
#12 Azure and Rose Optimum: Same question.


It's not forbidden.
@ 2026-04-19 3:44 PM (#39442 - in reply to #39439) (#39442) Top

Riad Khanmagomedov



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Riad Khanmagomedov posted @ 2026-04-19 3:44 PM

shedarshian - 2026-04-19 2:29 PM

In the first puzzle, does the "overlap" in "may intersect or overlap" means that one orthogon completely contains another?

One orthogon can completely contain another.
@ 2026-04-19 4:55 PM (#39443 - in reply to #39344) (#39443) Top

professorX



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professorX posted @ 2026-04-19 4:55 PM

In puzzle 3 Jigsaw with tips, in one column CN , LI both are given. Does that mean CN is seen first and then LI ?
Since CN is given on top ....

Edited by professorX 2026-04-19 4:56 PM
@ 2026-04-19 7:29 PM (#39444 - in reply to #39344) (#39444) Top

professorX



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2020
Country : India

professorX posted @ 2026-04-19 7:29 PM

In puzzle 7, for 0 sum in the bottom right corner, can a fully blackened cell be valid?
@ 2026-04-19 9:22 PM (#39445 - in reply to #39344) (#39445) Top

Barbitos



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Barbitos posted @ 2026-04-19 9:22 PM

I+believe+the+example+for+2%2E+Crossword%2DListovert+is+non+unique%2C+there+seems+to+be+a+second+solution+where+FIFIR+and+RUBIA+are+swapped%2C+and+every+word%27s+grid+rotation+is+shifted+90%C2%B0+compared+to+the+given+solution%0D%0A%0D%0AGiven%2C+i%27m+having+a+very+hard+time+wrapping+my+head+around+the+logic+of+this+genre+and+might%27ve+missed+a+rule+that+disambiguates+this%0D%0A%0D%0A
@ 2026-04-20 4:41 AM (#39446 - in reply to #39344) (#39446) Top

mstang




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mstang posted @ 2026-04-20 4:41 AM

(puzzle 4) What is meant by "loop that does not touch or intersect itself"? Is it like a Snake, where (copying from GP rules) "if two cells in the snake touch orthogonally, then they must be exactly one cell apart along the path of the snake, and if two cells in the snake touch diagonally, then they must be exactly two cells apart along the path of the snake"?

Also, there must be only one loop, right? The second to last sentence says "each circle belongs to a loop" (not "the loop").

Edited by mstang 2026-04-20 4:42 AM
@ 2026-04-20 10:53 AM (#39447 - in reply to #39446) (#39447) Top

prasanna16391



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prasanna16391 posted @ 2026-04-20 10:53 AM

mstang - 2026-04-20 4:41 AM

(puzzle 4) What is meant by "loop that does not touch or intersect itself"? Is it like a Snake, where (copying from GP rules) "if two cells in the snake touch orthogonally, then they must be exactly one cell apart along the path of the snake, and if two cells in the snake touch diagonally, then they must be exactly two cells apart along the path of the snake"?

Also, there must be only one loop, right? The second to last sentence says "each circle belongs to a loop" (not "the loop").


Your understanding for the loop is correct, it is a snake-like loop.

'A' vs 'the' is just translation issues that I missed, only one loop.
@ 2026-04-20 10:59 AM (#39448 - in reply to #39444) (#39448) Top

prasanna16391



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prasanna16391 posted @ 2026-04-20 10:59 AM

professorX - 2026-04-19 7:29 PM

In puzzle 7, for 0 sum in the bottom right corner, can a fully blackened cell be valid?


Yes that's valid.
@ 2026-04-20 11:03 AM (#39449 - in reply to #39443) (#39449) Top

Riad Khanmagomedov



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Riad Khanmagomedov posted @ 2026-04-20 11:03 AM

professorX - 2026-04-19 4:55 PM

In puzzle 3 Jigsaw with tips, in one column CN , LI both are given. Does that mean CN is seen first and then LI ?
Since CN is given on top ....

It's not necessary.
@ 2026-04-20 11:05 AM (#39450 - in reply to #39444) (#39450) Top

Riad Khanmagomedov



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Riad Khanmagomedov posted @ 2026-04-20 11:05 AM

professorX - 2026-04-19 7:29 PM

In puzzle 7, for 0 sum in the bottom right corner, can a fully blackened cell be valid?

Maybe.
@ 2026-04-20 11:09 AM (#39451 - in reply to #39445) (#39451) Top

Riad Khanmagomedov



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Riad Khanmagomedov posted @ 2026-04-20 11:09 AM

%5BQUOTE%5DBarbitos+%2D+2026%2D04%2D19++9%3A22+PM%0D%0A%0D%0AI+believe+the+example+for+2%2E+Crossword%2DListovert+is+non+unique%2C+there+seems+to+be+a+second+solution+where+FIFIR+and+RUBIA+are+swapped%2C+and+every+word%27s+grid+rotation+is+shifted+90%C2%B0+compared+to+the+given+solution%0D%0A%0D%0AGiven%2C+i%27m+having+a+very+hard+time+wrapping+my+head+around+the+logic+of+this+genre+and+might%27ve+missed+a+rule+that+disambiguates+this%0D%0A%0D%0A%5B%2FQUOTE%5D%0D%0AYou+cannot+swap+FIFIR+and+RUBIA+because+the+letter+R+is+upside+down%2E%0D%0A
Riad Khanmagomedov's April Contest — 19th to 28th April 202621 posts • Page 1 of 1 • 1
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