Rook sudoku
(Published on 21. July 2020, 11:58 by Lizzy01)
This is my first sudoku I've set! Since I saw people joking about rooks moves I've been wanting to do something with it, so here it is:
Rules:
Normal Sudoku rules apply. Digits 1-4 are pawns, 5's are kings, 8's are rooks. Rooks can 'see' all cells orthogonally until their view is blocked by a pawn. Kings are not allowed to be seen by a rook from outside their own 3x3 box. Digits in grey cells act as clues, (those in column 1 for their row and those in row 1 for their column), indicating how many cells the rook in their row/column can see in total, including cells with pawns blocking it's way, but not including the cell with the rook itself.
Solution code: row 5, column 7
Comments
on 5. November 2020, 16:11 by Lizzy01
@Storm Thank you!
on 3. November 2020, 23:28 by Storm
Superb puzzle with an innovative concept!
Had lots of fun :-D
on 16. October 2020, 17:45 by SudokuExplorer
@Lizzy01 This puzzle deserved more solves. I'm glad it finally got its well-deserved rating. :-)
Btw I took some inspiration from this puzzle to make my recent skyscraper puzzle (id=0004C7).
on 16. October 2020, 17:27 by Lizzy01
@Dotty @PrimeWeasel @marcmees @SudokuExplorer
Thank you!
on 29. September 2020, 12:55 by marcmees
thanks for the puzzle.
Thanks to sudokuexplorer for diverting my attention to this nice puzzle.
on 24. September 2020, 16:06 by PrimeWeasel
Really enjoyed that! Thanks
on 17. September 2020, 19:25 by Dotty
Great !
on 22. August 2020, 12:06 by apiyo
The Phisto way in was to realise that the 4 corner cells of the grid couldn't be 1223 or 1124 because that would force a 12 next to each other in the central thermometer ring. Hence the corners had to be 1133. Equally, then, 2 could not appear in the central ring at all, nor in the 16 corner cells. From here is solves as usual.
on 22. August 2020, 11:52 by apiyo
Oh that's interesting! Cause I couldn't think of a way to solve Without it!
on 22. August 2020, 11:35 by Lizzy01
@apiyo Thank you! I'd love to see that! No, I did not use that, I did think about it at first, but I decided to try it without, also because I didn't see an obvious way to actually use it.
on 22. August 2020, 07:22 by apiyo
This was heaps of fun Lizzy! I solved in 30 minutes, after a ten minute wrong path that forced me to reset. Not sure if I made a misstep or had not fully grasped the rules. I recorded a video of my solve, I'll let you know if I upload it to youtube.
To solve it I mocked it up in f-puzzles. Although the particularities of the rules can't be upheld by the software, it's still a great tool for solving.
on 22. August 2020, 01:58 by apiyo
I'm curious @Lizzy01, for my puzzle, did you rely on Phisomefel's principle to break into the puzzle?
on 20. August 2020, 14:11 by Lizzy01
@psams @bosjo Thanks!
on 14. August 2020, 15:12 by bosjo
Great puzzle! Twice I were stumped by false reasoning, and thought there was something I had misunderstood about the rules. But after sleeping on it I finally got it right.
on 13. August 2020, 13:05 by psams
Nice puzzle. I enjoyed the way the edge cells that were not grey added to the options available during the solve.
on 3. August 2020, 18:34 by Lizzy01
@BobAndWeave I don't really know how to explain it more clearly, or how to give a ittle hint without revealing too much, but I'll give it a try. Read the rules carefully, maybe you just missed something. As said in the rules, 'rooks' (8's) can see all cells in their row and column up to and including the first 'pawns' (1's 2's 3's and 4's). Digits in grey cells tell how many cells the rook in their row/column can see. So the 8 in the row of the given 9 sees 9 cells throughout the grid. hint: think about where certain digits can go in row 1 and column 1, and how the digits can be arranged in row 7, and how a rook can ever see how many cells/ how few cells.
on 3. August 2020, 00:21 by BobAndWeave
I'm stuck on this, maybe I'm just not understanding the rules or the clues? I've played with it for about 45 minutes and can't get a single digit.
on 26. July 2020, 19:08 by Lizzy01
added chess tags
on 21. July 2020, 16:37 by Lizzy01
@SudokuExplorer @Rotstein Thank you!
on 21. July 2020, 16:02 by SudokuExplorer
Congratulations on setting such a beautiful puzzle! :-) I needed to colour some cells to keep track of which rules I had used.
on 21. July 2020, 13:27 by Rotstein
very nice idea indeed
on 21. July 2020, 12:14 by SudokuExplorer
@Lizzy01 I am a little unsure about the grey cells. Is a column 1 clue, the number of cells the rook (in that row) can see in that row or can see throughout the grid? Nice concept btw :-)
Edit: Never mind, the 9 clue cleared that up!
