SudokuSolver Forum

A forum for Sudoku enthusiasts to share puzzles, techniques and software
It is currently Thu Mar 28, 2024 12:53 pm

All times are UTC




Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Wed Mar 25, 2020 3:42 pm 
Offline
Addict
Addict

Joined: Thu Nov 28, 2019 5:57 pm
Posts: 54
Tossing out some puzzles for people who are isolating and keeping safe. I wanted to pick something already popular and familiar based on the number of hits, and make them not too hard. This blog post is the result.

Image

Image

Image

For a few more, visit the blog here at Quadrata.


Top
 Profile  
Reply with quote  
PostPosted: Wed Mar 25, 2020 10:29 pm 
Offline
Regular
Regular

Joined: Mon Aug 20, 2012 5:03 am
Posts: 15
Here is a bit of a different way to combine Sudoku with chess.

Note: In chess, the ranks are numbered from bottom to top, 1 through 8. The files are lettered a through h, left to right. In a normal chess game, the white pieces start on ranks 1-2 (at the bottom), the black pieces on ranks 7-8 (at the top).

Image

Starting with this position, fill the board with two complete chess sets of white and black pieces (2 kings, 2 queens, 4 bishops, 4 knights, 4 rooks, and 16 pawns of each color, 64 pieces total) in such a way that:

1. No king is in check.
2. There are no pawns on the first or eighth ranks.
3. There are exactly two white pawns and exactly two black pawns on each file, with each of the two white pawns occupying a lower-numbered rank than each of the two black pawns.
4. There are at most five white pawns on any rank, and at most five black pawns on any rank.
5. All pieces on the first and second ranks are white, and all pieces on the seventh and eighth ranks are black.
6. Of the four white bishops, two are on light squares and two are on dark squares, and similarly for the four black bishops.
7. No white rook is on the same rank or file as any black rook or black queen, and no black rook is on the same rank or file as any white rook or white queen.
8. No white bishop is on the same diagonal as any black bishop or black queen, and no black bishop is on the same diagonal as any white bishop or white queen.
9. No white queen is on the same rank, file, or diagonal as any black queen.
10. No white knight is a knight’s move away from any black knight.

Unless I’ve messed up, this puzzle has one, and only one, solution.

Bill Smythe


Top
 Profile  
Reply with quote  
PostPosted: Sat Mar 28, 2020 8:12 pm 
Offline
Grand Master
Grand Master

Joined: Wed Apr 30, 2008 9:45 pm
Posts: 693
Location: Saudi Arabia
Bill

I'll try, but it will take time to get my head around all the rules. However I should not complain given some of my multi rule puzzles.

Maurice


Top
 Profile  
Reply with quote  
PostPosted: Sun Mar 29, 2020 4:40 pm 
Offline
Regular
Regular

Joined: Mon Aug 20, 2012 5:03 am
Posts: 15
You're not supposed to complain, you're supposed to suffer. :twisted:

Hint: Start with rules 2 and 3 (the pawns). You will find that, on some files, that's already enough to locate all the pawns. And on some other files, it's almost enough.

Hint 2: Don't try to write a program that will solve the puzzle. You'll get there a lot faster if you simply work it out by hand. :| Oh my, how old-fashioned. :|

Bill Smythe


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 7 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:  
cron
Powered by phpBB® Forum Software © phpBB Group