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Puzzle 11/05/19: ~ Extreme (difficult?)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun May 15, 2011 9:22 pm    Post subject: Puzzle 11/05/19: ~ Extreme (difficult?) Reply with quote
In case you finish all of the others before I return.

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

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Wed May 18, 2011 6:18 pm    Post subject: Reply with quote
A two-stepper with a nice ALS move (a doubly linked als-xz I think - though I found it as a chain)
Quote:
als-xz ; ant(379=8)r257c3 - anp(8=23)r78c9 - (3=5)r4c9 - ant(5=379)r245c3 - loop ; r8c3<>39=4, r9c3<>37, r136c9<>3
xy-chain-als ; (3=9)r5c6 - anp(9=37)r1c6|r2c5 - (3=6)r3c4 - (6=3)r9c4 ; r78c6<>3
Fwiw this can be re-built as a single stepper kraken/almost-aic...
Quote:
kraken aals(37)r1c6|r2c5, (9)r1c6, (9)r2c5 ; r789c6<>3
np(37)r1c6|r2c5 - (3=6)r3c4 - (6=3)r9c4 - (3)r789c6
||
(9)r1c6 - (9=3)r5c6 - (3)r789c6
||
(9)r2c5 - r2c13=r3c2 - (9=3)r8c2 - (37=8)r7c13 - (8=23)r78c9 - (3)r46c9=r6c7 - r6c5=r5c6 - (3)r789c6
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu May 26, 2011 10:47 pm    Post subject: Reply with quote
A nine-stepper, including two URs, an ER, Finned X-Wing, four AICs and an XY-Wing.
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri May 27, 2011 12:08 am    Post subject: Reply with quote
As mentioned recently, Extreme puzzles should contain a useful Fish of size N=3 or larger.

Code:
 after basics
 +-----------------------------------------------------------------------+
 |  48     5      6      |  1      2      379    |  349    38     3478   |
 |  379    1      379    |  4      379    8      |  2      5      6      |
 |  48     379    2      |  36     3679   5      |  1349   138    3478   |
 |-----------------------+-----------------------+-----------------------|
 |  6      4      35     |  2      8      1      |  7      9      35     |
 |  2      379    379    |  5      4      39     |  8      6      1      |
 |  359    8      1      |  7      39     6      |  34     2      345    |
 |-----------------------+-----------------------+-----------------------|
 |  37     6      378    |  9      1      237    |  5      4      238    |
 |  1      39     349    |  8      5      234    |  6      7      23     |
 |  357    2      34578  |  36     367    347    |  13     138    9      |
 +-----------------------------------------------------------------------+
 # 70 eliminations remain

 Franken Jellyfish c4578\r69b23  =>  r1c69,r3c9,r6c19,r9c136<>3
 +-----------------------------------+
 |  .  .  .  |  .  . -3  | *3 *3 -3  |
 |  3  .  3  |  . *3  .  |  .  .  .  |
 |  .  3  .  | *3 *3  .  | *3 *3 -3  |
 |-----------+-----------+-----------|
 |  .  .  3  |  .  .  .  |  .  .  3  |
 |  .  3  3  |  .  .  3  |  .  .  .  |
 | -3  .  .  |  . *3  .  | *3  . -3  |
 |-----------+-----------+-----------|
 |  3  .  3  |  .  .  3  |  .  .  3  |
 |  .  3  3  |  .  .  3  |  .  .  3  |
 | -3  . -3  | *3 *3 -3  | *3 *3  .  |
 +-----------------------------------+

 <37+9>  XYZ-Wing r2c5/r1c6+r6c5         <> 9    r3c5

   c15   X-Wing                          <> 9    r2c3

 r39c45  <36> UR Type 2.2233             <> 7    r2c5

Of course, that doesn't mean much when you're searching for them with pencil & paper. _ Confused _

Regards, Danny
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Fri May 27, 2011 12:35 pm    Post subject: Reply with quote
daj95376 wrote:
Of course, that doesn't mean much when you're searching for them with pencil & paper.

I never look for them to be honest - sometimes I stumble across something when following x-chains w/wo groups, but otherwise a swordfish is my limit!
I will make a mental note to look harder when you label them as "Extreme". Thanks for posting the solution.
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