| View previous topic :: View next topic |
| Author |
Message |
Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
|
 Posted: Mon Jul 01, 2013 2:59 pm Post subject: Is this puzzle valid? |
 |
|
If someone has Sudoku software, would you be kind enough to plug this in and let me know if it's valid? Thanks.
(Is there an online tool that can do this?)
| Code: |
+-------+-------+-------+
| 2 3 . | 8 . . | . 9 . |
| 1 . . | . . 5 | . . . |
| . . . | 1 . . | 4 . . |
+-------+-------+-------+
| . 2 7 | . . . | . . . |
| 5 1 . | . . . | . 8 2 |
| . . . | . . . | 6 5 . |
+-------+-------+-------+
| . . 6 | . . 2 | . . . |
| . . . | 3 . . | . . 5 |
| . 9 . | . . 7 | . 4 3 |
+-------+-------+-------+
|
Play this puzzle online at the Daily Sudoku site |
|
| Back to top |
|
 |
keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
|
| Posted: Mon Jul 01, 2013 3:15 pm Post subject: |
|
|
Yes, it is a valid puzzle.
| Code: | +-------+-------+-------+
| 2 3 4 | 8 7 6 | 5 9 1 |
| 1 7 8 | 9 4 5 | 3 2 6 |
| 9 6 5 | 1 2 3 | 4 7 8 |
+-------+-------+-------+
| 6 2 7 | 5 9 8 | 1 3 4 |
| 5 1 3 | 7 6 4 | 9 8 2 |
| 4 8 9 | 2 3 1 | 6 5 7 |
+-------+-------+-------+
| 3 5 6 | 4 8 2 | 7 1 9 |
| 7 4 2 | 3 1 9 | 8 6 5 |
| 8 9 1 | 6 5 7 | 2 4 3 |
+-------+-------+-------+ |
Keith |
|
| Back to top |
|
|
keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
|
| Posted: Mon Jul 01, 2013 3:36 pm Post subject: Re: Is this puzzle valid? |
|
|
| Marty R. wrote: | If someone has Sudoku software, would you be kind enough to plug this in and let me know if it's valid? Thanks.
(Is there an online tool that can do this?) |
Try Helmut's Sudoku Helper:
http://www.saueregger.at/sudoku/HSH/HSH.htm
Keith |
|
| Back to top |
|
|
Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
|
| Posted: Mon Jul 01, 2013 4:44 pm Post subject: |
|
|
| Thanks Keith. Every once in a while this happens. Four times I've done this puzzle and ended with an invalidity. I'm pretty sure it's valid but can't figure out what I'm doing wrong but feel better about trying it again when I know for sure it's valid. |
|
| Back to top |
|
|
Pat
Joined: 23 Feb 2010
Posts: 207
|
| Posted: Tue Jul 02, 2013 7:56 am Post subject: |
|
|
nice tool,
but seems to accept all puzzles
regardless of number of answers
try Paul Stephens
click import-export
in the new window, paste the puzzle
( empty cell must be a dot )
click import,
then OK
- 0 answers:
pop-up window with clear warning
- 2-or-more answers:
warning is there but less clear
( red text on orange background ):
"WARNING - This puzzle has more than one solution"
|
|
| Back to top |
|
|
nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
|
| Posted: Tue Jul 02, 2013 4:02 pm Post subject: |
|
|
Indeed, the Sudoku Helper will try to solve the puzzle and does not check for validity. Therefore it might end with the "sorry, cannot solve it" message. or - worse - with an error.
I do have a tool that checks for number of solutions - which, BTW is part of the Sudoku creation process - but so far I've been reluctant to put parts of the Sudoku creation process out in the public domain ...
Let me think about it for a while, maybe I'll just go and put it on the server and make an addition to the Sudoku Formatter.
Helmut
THe puzzle in question though, is a valid puzzle and HSH gives those steps to solve it:
Found 1 solution(s) in 20 milliseconds.
234876591178945326965123478627598134513764982489231657356482719742319865891657243
Top rating=8
Statistics of steps taken: 7/94/6/5/0/0/2/1/3/0. time:1238 ms.
rating 2; Subset naked pair 47 box 7
rating 2; Subset naked pair 12 row 9
rating 2; Subset naked pair 47 row 8
rating 2; Subset naked pair 56 box 8
rating 3; Subset quad 1289 row 8
rating 3; Subset quad 3489 box 4
rating 3; Subset quad 2379 row 3
rating 3; Subset quad 3679 row 5
rating 3; Subset quint 13589 row 4
rating 7; m-wing (7) via "9" - 5 advanced moves available.
rating 2; Subset naked pair 68 box 3
rating 2; Subset naked pair 68 col 9
rating 8; Unique Rectangle ('UR') 12 - 3 advanced moves available.
rating 8; Unique Rectangle ('UR') 49 - 2 advanced moves available.
rating 6; kite (9) - 3 advanced moves available.
rating 6; coloring (9) - 2 advanced moves available.
rating 8; Unique Rectangle ('UR') 68 - 2 advanced moves available. |
|
| Back to top |
|
|
Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
|
| Posted: Tue Jul 02, 2013 9:36 pm Post subject: |
|
|
| For what it's worth, I solved it (on the 5th try) with an M-Wing on 79 and Type 1 UR on 68. |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
