SudokuSolver Forum

A forum for Sudoku enthusiasts to share puzzles, techniques and software
It is currently Sat Aug 15, 2020 11:07 am

All times are UTC




Post new topic Reply to topic  [ 8 posts ] 
Author Message
 Post subject: Fourth of July Puzzle
PostPosted: Thu Jul 02, 2020 3:53 pm 
Offline
Addict
Addict

Joined: Thu Nov 28, 2019 5:57 pm
Posts: 24
Here's something I designed with red, white, and blue stars representing different multiples of five. A red star means the sum of the entries equals 10, white for 5, and blue for 15. Inside each cage, clues are placed between cells whenever possible so lack of a star gives important information as well. (No clues are placed on the major gridlines.)

Image

Solution and a PDF can be found here: https://quadratablog.blogspot.com/2020/ ... uzzle.html


Top
 Profile  
Reply with quote  
PostPosted: Thu Jul 02, 2020 11:05 pm 
Offline
Grand Master
Grand Master
User avatar

Joined: Thu Apr 24, 2008 4:27 pm
Posts: 790
I like the concept! Hopefully this puzzle isn't out of my league with respect to difficulty, but I'll give it a try.


Top
 Profile  
Reply with quote  
PostPosted: Sat Jul 04, 2020 3:49 pm 
Offline
Grand Master
Grand Master
User avatar

Joined: Thu Apr 24, 2008 4:27 pm
Posts: 790
An enjoyable puzzle, but unless I'm missing something, it has multiple solutions (can't figure a way to show the stars from SudokuSolver):


Attachment:
Quadrata Fives Star Sumdoku.png
Quadrata Fives Star Sumdoku.png [ 24.02 KiB | Viewed 720 times ]


Top
 Profile  
Reply with quote  
PostPosted: Mon Jul 06, 2020 6:29 pm 
Offline
Grand Master
Grand Master

Joined: Wed Apr 30, 2008 9:45 pm
Posts: 635
Hi enxio

One of David specialties is if and only if.

Note r4c9 cannot be a 3 as this would require a star to its left.

This negative inference has only been used to lock down the multiple solutions, I would like to see it needed earlier in the solution process.

Maurice


Top
 Profile  
Reply with quote  
PostPosted: Mon Jul 06, 2020 8:00 pm 
Offline
Grand Master
Grand Master
User avatar

Joined: Thu Apr 24, 2008 4:27 pm
Posts: 790
Hmmmm. . . I interpreted that "if and only if" differently. I did not interpret it to mean that two adjacent squares MUST have a star in order for their sum to equal a multiple of 5. If that's the case, then I guess I need to rework the puzzle.


Top
 Profile  
Reply with quote  
PostPosted: Tue Jul 07, 2020 6:38 am 
Offline
Grand Master
Grand Master

Joined: Wed Apr 30, 2008 9:45 pm
Posts: 635
As I said in this one it is only needed for the final lock down.

I'll try and make one where it is incorporated in the puzzle.


Top
 Profile  
Reply with quote  
PostPosted: Tue Jul 07, 2020 3:19 pm 
Offline
Grand Master
Grand Master
User avatar

Joined: Thu Apr 24, 2008 4:27 pm
Posts: 790
Ok, then, I have it finished. A fun little puzzle with a great theme, but the added constraint makes it a little exhausting. Definitely not a bedtime puzzle.


Top
 Profile  
Reply with quote  
PostPosted: Thu Jul 16, 2020 5:12 pm 
Offline
Addict
Addict

Joined: Thu Nov 28, 2019 5:57 pm
Posts: 24
Yeah it definitely takes a bit more work when you have to focus on the places where there are no clues, in addition to the ones where there are. Thanks for checking it out!


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group