dailysudoku.com :: View topic

dailysudoku.com
Discussion of Daily Sudoku puzzles

FAQ

Memberlist

Usergroups

Profile

1/6 Fiendish

dailysudoku.com Forum Index -> Other puzzles

View previous topic :: View next topic

Author

Message

sheryl

Joined: 24 Sep 2007
Posts: 64
Location: New York

Posted: Wed Jan 07, 2009 12:29 pm Post subject: 1/6 Fiendish

has anyone done the 1/6 fiendish from this site: http://www.playr.co.uk/sudoku/index.php?class=5&date=2009-01-06 i couldn't get anywhere. If it's solveable will you please tell me the methods used.

Earl

Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

Posted: Wed Jan 07, 2009 1:09 pm Post subject: fiendish

I was also stumped. Earl

Steve R

Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England

Posted: Wed Jan 07, 2009 1:22 pm Post subject:

At this point

Code:

+--------------------------------------------+
| 1 359 7 | 3459 349 359 | 2 8 6 |
| 24 2589 89 | 589 7 6 | 1 3 45 |
| 234 358 6 | 1358 23 12358 | 45 7 9 |
----------------------------------------------
| 5 239 19 | 379 8 2379 | 6 4 13 |
| 23 2389 189 | 6 239 4 | 379 5 137 |
| 6 7 4 | 139 5 139 | 39 2 8 |
----------------------------------------------
| 7 1 2 | 3459 349 359 | 8 6 35 |
| 8 6 5 | 2 1 37 | 347 9 347 |
| 9 4 3 | 578 6 578 | 57 1 2 |
+--------------------------------------------+

I could only find a small chain

r5c9 = 1 => r4c9 = 3 => r7c9 = 5 => r9c7 = 7 => r5c9 = 7.

This places 1 in r4c9 and solves the puzzle. Perhaps colouring would solve it too.

Steve

wapati

Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.

Posted: Wed Jan 07, 2009 1:23 pm Post subject:

Happy New Year, one and all!

Code:

1 . .|. . .|2 8 .
. . .|. 7 6|1 3 .
. . 6|. . .|. 7 9
-----+-----+-----
5 . .|. 8 .|. 4 .
. . .|6 . 4|. . .
. 7 .|. 5 .|. . 8
-----+-----+-----
7 1 .|. . .|8 . .
. 6 5|2 1 .|. . .
. 4 3|. . .|. . 2

It is a valid puzzle that simplifies to here.

Code:

.---------------------.---------------------.---------------------.
| 1 359 7 | 3459 349 359 | 2 8 6 |
| 24 2589 89 | 589 7 6 | 1 3 45 |
| 34 358 6 | 1358 23 12358 | 45 7 9 |
:---------------------+---------------------+---------------------:
| 5 239 19 | 379 8 2379 | 6 4 13 |
| 23 2389 189 | 6 239 4 | 379 5 137 |
| 6 7 4 | 139 5 139 | 39 2 8 |
:---------------------+---------------------+---------------------:
| 7 1 2 | 3459 349 359 | 8 6 35 |
| 8 6 5 | 2 1 37 | 347 9 347 |
| 9 4 3 | 578 6 578 | 57 1 2 |
'---------------------'---------------------'---------------------'

Here you could use an ALS to solve it, or two 4 cell xy chains.

Code:

.---------------------.---------------------.---------------------.
| 1 359 7 | 3459 349 359 | 2 8 6 |
|*24 2589 89 | 589 7 6 | 1 3 *45 |
| 34 358 6 | 1358 23 12358 | 45 7 9 |
:---------------------+---------------------+---------------------:
| 5 239 19 | 379 8 2379 | 6 4 13 |
|*23 2389 189 | 6 239 4 | 379 5 17-3 |
| 6 7 4 | 139 5 139 | 39 2 8 |
:---------------------+---------------------+---------------------:
| 7 1 2 | 3459 349 359 | 8 6 *35 |
| 8 6 5 | 2 1 37 | 347 9 347 |
| 9 4 3 | 578 6 578 | 57 1 2 |
'---------------------'---------------------'---------------------'

.---------------------.---------------------.---------------------.
| 1 359 7 | 3459 349 359 | 2 8 6 |
| 24 2589 89 | 589 7 6 | 1 3 45 |
| 34 358 6 | 1358 23 12358 | 45 7 9 |
:---------------------+---------------------+---------------------:
| 5 239 19 | 379 8 2379 | 6 4 *13 |
| 23 2389 189 | 6 239 4 | 39-7 5 *17 |
| 6 7 4 | 139 5 139 | 39 2 8 |
:---------------------+---------------------+---------------------:
| 7 1 2 | 3459 349 359 | 8 6 *35 |
| 8 6 5 | 2 1 37 | 347 9 34-7 |
| 9 4 3 | 578 6 578 |*57 1 2 |
'---------------------'---------------------'---------------------'

One way of showing the one step ALS is this.

Code:

.---------------------.---------------------.---------------------.
| 1 359 7 | 3459 349 359 | 2 8 6 |
| 24 2589 89 | 589 7 6 | 1 3 45 |
| 34 358 6 | 1358 23 12358 | 45 7 9 |
:---------------------+---------------------+---------------------:
| 5 239 19 | 379 8 2379 | 6 4 *13 |
| 23 2389 189 | 6 239 4 | 39-7 5 *137 |
| 6 7 4 | 139 5 139 | 39 2 8 |
:---------------------+---------------------+---------------------:
| 7 1 2 | 3459 349 359 | 8 6 *35 |
| 8 6 5 | 2 1 37 | 347 9 34-7 |
| 9 4 3 | 578 6 578 |#57 1 2 |
'---------------------'---------------------'---------------------'

Display posts from previous:

	dailysudoku.com Forum Index -> Other puzzles	All times are GMT
Page 1 of 1

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 vote in polls in this forum