irregular ? clueless

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irregular ? clueless

Postby Hajime » Thu May 17, 2018 9:22 am

A question mark made up from 9 partly overlapping (not box-wise) Sudoku's.
Overlapping areas are clueless.
A 10th clueless Sudoku is colored light yellow and the orange dot is the center box.

The first one is easy to solve: only box/row/column eliminations and hidden/naked singles needed.

Picture:
Hidden Text: Show
question_easy.png
question - easy
question_easy.png (82 KiB) Viewed 79 times

Also in code (from head to tail)
Hidden Text: Show
000000003950106080600000090009003200520008004700904061000000010480000000000000706
009000000000000000083000000402005007000000000005060000000000000294500000000000000
014600000900000000000080000000250000000700000000009600005020000000040010000000020
050009000000000000006000008000010000000050700000000000000000500000000000000020900
000000206000905000000000005000000000000000000000000700000060070000000000700000000
000000100000000000000080000000005800000000000000030005600010008080000000000000040
400000000020007900000060000001050000000000700000000000000000000000000000000003009
000000000090000000000000000040260000200000000030005000600000097000400050000000000
000000000045000000000103000400090030000038000007000506500004800620809005000000000


The second one is more difficult (moderate). Techniques to be used are:
- box --> row/column elimination and vv
- naked/hidden pairs/triplets/...

Picture:
Hidden Text: Show
question_moderate.png
question - moderate
question_moderate.png (83.87 KiB) Viewed 79 times

In code:
Hidden Text: Show
000000006890560400006100080040090701900001004000000000023000050005000008700000300
500090000003010000000000000007000100830000000009020000320000000080900005000000000
000200000801000000000014000000090000000301500000000000000070400000003000000000001
000008030000030090000007500000050000000000300000000600000000000000000000003000000
000040000000070500000000000000000060000000000000002090800900006000000000002000000
000000000000000000000010007000000002000000000000060800000004001304000000000000000
000000000002000000100000750000390010000000002000000000000000000008000009000000000
000000000000000000000000000009000000000304000000000002204000000100000000000000000
000000000509070006000500000000000301000300000060400080900004005070038600004090000


I presume most solvers have trouble with the irregular overlapping ;) .
Hajime
 
Posts: 19
Joined: 20 April 2018

Re: irregular ? clueless

Postby enxio27 » Thu May 17, 2018 1:39 pm

Interesting concept! Just an FYI: The light yellow clueless boxes are extremely difficult to see. The bright yellow background makes it even more difficult.
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Re: irregular ? clueless

Postby creint » Thu May 17, 2018 8:05 pm

Solved with solver each within 5 seconds.
It solves from head to tail too.
Second one only needs pointing/boxline reducion, no need for pairs/triples.
creint
 
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Re: irregular ? clueless

Postby Hajime » Mon May 21, 2018 9:35 pm

Are these kind of puzzels appreciated? Or only solved by automated solvers :?
Hajime
 
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Re: irregular ? clueless

Postby enxio27 » Tue May 22, 2018 1:41 pm

Hajime wrote:Are these kind of puzzels appreciated? Or only solved by automated solvers :?

I don't know how many others here like gattai and puzzles with extra constraints, but I appreciate them! It just takes me a while to solve them, although I've been making a point of finding more bits of sudoku time throughout my day. Don't let creint bother you. I think he just likes to show off. :roll:

I have been hoping for an updated gattai maker for quite a while now. JSudoku is no longer being maintained, and doesn't include the newer gattai shapes. The ones who used to make and post gattai (Ruud, Boerge, et al) have left the sudoku forums for other activities. I'm thrilled that you and 1to9only have been posting new puzzles recently, and I'm working my way through them as fast as I can.
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