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Puzzle 10/07/25: B

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sun Jul 25, 2010 3:15 pm Post subject: Puzzle 10/07/25: B

Code:

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

Play this puzzle online at the Daily Sudoku site

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Sun Jul 25, 2010 6:45 pm Post subject:

xy- 348
UR type 1, {39}

Code:

+----------------+------------------+-----------+
| 2 8 1 | 9 5 6 | 7 3 4 |
| 4 3 7 | 28 1 28 | 6 9 5 |
| 9 6 5 | 7 (34) 34 | 2 8 1 |
+----------------+------------------+-----------+
| 6 24 8 | 234 7 239 | 5 1 39 |
| 35 1 239 | 6 8 2359 | 39 4 7 |
| 7 45 9(3) | 45 9(3) 1 | 8 2 6 |
+----------------+------------------+-----------+
| 1 7 (23) | 35 239 59 | 4 6 8 |
| 58 5(2) 6 | 1 -4(2) 48 | 39 7 39 |
| 38 9 4 | 38 6 7 | 1 5 2 |
+----------------+------------------+-----------+

(4=3)r3c5 - (3)r6c5 = (3)r6c3 - (3=2)r7c3 - (2)r8c2 = (2)r8c5; r8c5 <> 4

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Mon Jul 26, 2010 1:01 am Post subject:

One stepper..............

Quote:

Kraken cell (359)r7c6
(3)r7c6; r9c4<>3
(5)r7c6-(5=3)r7c4; r9c4<>3
(9)r7c6-r7c5=r6c5-(9=3)r6c3-r7c3=(3)r9c1; r9c4<>3

Ted

peterj

Joined: 26 Mar 2010
Posts: 974
Location: London, UK

Posted: Mon Jul 26, 2010 11:04 am Post subject:

I don't think I really know what a 'kraken cell' is? Seems to be like a cell forcing chain? (Don't mean anything perjorative by that!)

Another one stepper is an ANP..

Quote:

ANP[(9)r7c5=(23)r7c35] - (3=5)r7c4 - (5=4)r6c4 - (4=5)r6c2 - (5=2)r8c2 - (2=3)r7c3 - (3=9)r6c3 ; r6c5<>9

Interestingly the same cells in the xy-chain also form a cycle which does damage on 3s and 5s

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Mon Jul 26, 2010 5:25 pm Post subject:

peterj wrote:

I don't think I really know what a 'kraken cell' is? Seems to be like a cell forcing chain? (Don't mean anything perjorative by that!)

Peter,

Here is the reference I used for an understanding of Kraken cells: http://www.dailysudoku.co.uk/sudoku/forums/viewtopic.php?p=25381#25381

I believe you were also involved in the posts.

Ted

peterj

Joined: 26 Mar 2010
Posts: 974
Location: London, UK

Posted: Mon Jul 26, 2010 5:43 pm Post subject:

tlanglet wrote:

I believe you were also involved in the posts.

Clearly I have a short memory!

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon Jul 26, 2010 5:57 pm Post subject:

peterj wrote:

Clearly I have a short memory!

And I have a hard time distinguishing an almost technique from one with a Kraken Cell. But I'm pretty sure that Ted's solution is a forcing chain because there's no technique associated with the cell.

Sudopedia only has "Kraken Fish", so we have another instance of a phrase missing a definition.

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