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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1999
   
Location: India |
This annual contest shall take place from 19-28 April 2026.
More details shall be shared in subsequent posts soon.
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1999
Location: India | Some notes about April Contest 2026Please 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.
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Posts: 48
Location: India | At what time will the contest start? |
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Posts: 3603
Location: India | 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. |
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Posts: 3603
Location: India | The Puzzle Booklet is now available. Good luck to all participants! |
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Posts: 3603
Location: India | 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. |
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Posts: 197
Location: New Zealand | Admin: Please make this thread non-restricted. |
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Posts: 197
Location: New Zealand | #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. |
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Posts: 2
Location: China | In the first puzzle, does the "overlap" in "may intersect or overlap" means that one orthogon completely contains another? |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1999
Location: India | 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. |
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Moscow Puzzle Cup 2016 Author
Posts: 267
Location: Russia | 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. |
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Moscow Puzzle Cup 2016 Author
Posts: 267
Location: Russia | 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. |
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Posts: 48
Location: India | 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
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Posts: 48
Location: India | In puzzle 7, for 0 sum in the bottom right corner, can a fully blackened cell be valid? |
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Posts: 12
Location: France | 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+eve
ution+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%2
ared+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+r
+the+logic+of+this+genre+and+might%27ve+missed+a+rule+that+disambiguates+this%0D%0A%0D%0A
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Posts: 79
Location: United States | (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
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1999
Location: India | 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. |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1999
Location: India | 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. |
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Moscow Puzzle Cup 2016 Author
Posts: 267
Location: Russia | 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. |
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Moscow Puzzle Cup 2016 Author
Posts: 267
Location: Russia | 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. |
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Moscow Puzzle Cup 2016 Author
Posts: 267
Location: Russia | %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
d%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
%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+
iven%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
+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
A+because+the+letter+R+is+upside+down%2E%0D%0A
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Posts: 2
Location: China | In puzzle #3, does a pink circle allowed to be at the intersection of two words? If allowed, how does it transfer to #4? Pick one? |
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Moscow Puzzle Cup 2016 Author
Posts: 267
Location: Russia | shedarshian - 2026-04-20 4:08 PM
In puzzle #3, does a pink circle allowed to be at the intersection of two words? If allowed, how does it transfer to #4? Pick one?
When transferring, select one of the two options that are suitable for you. |
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Posts: 151
Location: India | 3%3a+good+questrion%2c+and+is+the+Jigsaw+puzzle+independently+unique+or+is+one+supposed+to+find+a+solution+that+works+for+the+Pentoloop%3f%0a11%3a+Wha
lution+that+works+for+the+Pentoloop%3f%0a11%3a+What+is+meant+by+this+%22Words+should+read+from+left+to+right+and+right+to+left%2c+or+top+to+bottom+and
to+right+and+right+to+left%2c+or+top+to+bottom+and+bottom+to+top.++%22+why+are+and+and+or+used+interchangeably%3f+I+interpret+it+as+you+can+only+use+b
changeably%3f+I+interpret+it+as+you+can+only+use+both+directions+horizontally%2c+or+only+vertically.+%0a10%3a+%22Does+not+touch+itself%22+is+not+ambig
+%0a10%3a+%22Does+not+touch+itself%22+is+not+ambiguous.+Diagonal+%3f%0aPieces+can+be+repeated%3f%0a+
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Moscow Puzzle Cup 2016 Author
Posts: 267
Location: Russia | anurag - 2026-04-20 4:38 PM
3: good questrion, and is the Jigsaw puzzle independently unique or is one supposed to find a solution that works for the Pentoloop?
11: What is meant by this "Words should read from left to right and right to left, or top to bottom and bottom to top. " why are and and or used interchangeably? I interpret it as you can only use both directions horizontally, or only vertically.
10: "Does not touch itself" is not ambiguous. Diagonal ?
Pieces can be repeated?
3. At the very top of the page it says "solve two related puzzles".
11. Words can be read in any of the 4 directions, as in the example.
10. The standard rule for the loop: Loop does not touch or intersect itself. In the example, the V pentomino is used twice. In this sense, it is possible to repeat. But there is no third V pentomino among the 14 given pentominoes. Therefore, you cannot use the V pentomino three times. |
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WSPC 2017 • Schedule • Participation • Location • WSC • WPC • Contact •Search •Recent
Riad Khanmagomedov's April Contest — 19th to 28th April 2026
