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Puzzle 11/07/21: ~ Extreme

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu Jul 21, 2011 3:19 pm    Post subject: Puzzle 11/07/21: ~ Extreme Reply with quote
Code:
 +-----------------------+
 | 8 5 . | 3 . . | . 9 . |
 | 9 . . | . . . | . . 1 |
 | . . 1 | 9 . . | 5 6 8 |
 |-------+-------+-------|
 | 1 . 2 | . 7 . | . 5 9 |
 | . . . | 1 2 3 | 8 . . |
 | . . . | . 5 . | . . . |
 |-------+-------+-------|
 | . . 3 | . 8 . | 9 . . |
 | 5 . 8 | 7 . . | . . . |
 | . 1 9 | 6 . . | . . 5 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Thu Jul 21, 2011 9:14 pm    Post subject: Reply with quote
Two steps...

Quote:
Kraken x-wing(2)r68c89=(2)r8c2-r23c2=r3c1-r3c6=r1c6; r1c9<>2
anp(47=2)r1c97-(2=7)r9c7-r7c9=r1c9; r1c6,r2c78<>7

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu Jul 21, 2011 11:53 pm    Post subject: Reply with quote
Ted, I'm still left at this point after performing your two steps.

Code:
 *-----------------------------------------------------------*
 | 8     5     6     | 3     1     2     | 47    9     47    |
 | 9     47    47    | 5     6     8     | 23    23    1     |
 | 23    23    1     | 9     4     7     | 5     6     8     |
 |-------------------+-------------------+-------------------|
 | 1     38    2     | 48    7     6     | 34    5     9     |
 | 47    9     5     | 1     2     3     | 8     47    6     |
 | 36    368   47    | 48    5     9     | 1     2347  23    |
 |-------------------+-------------------+-------------------|
 | 467   467   3     | 2     8     5     | 9     1     47    |
 | 5     24    8     | 7     9     1     | 6     234   23    |
 | 27    1     9     | 6     3     4     | 27    8     5     |
 *-----------------------------------------------------------*
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Jul 22, 2011 12:52 am    Post subject: Reply with quote
daj95376 wrote:
Ted, I'm still left at this point after performing your two steps.

Code:
 *-----------------------------------------------------------*
 | 8     5     6     | 3     1     2     | 47    9     47    |
 | 9     47    47    | 5     6     8     | 23    23    1     |
 | 23    23    1     | 9     4     7     | 5     6     8     |
 |-------------------+-------------------+-------------------|
 | 1     38    2     | 48    7     6     | 34    5     9     |
 | 47    9     5     | 1     2     3     | 8     47    6     |
 | 36    368   47    | 48    5     9     | 1     2347  23    |
 |-------------------+-------------------+-------------------|
 | 467   467   3     | 2     8     5     | 9     1     47    |
 | 5     24    8     | 7     9     1     | 6     234   23    |
 | 27    1     9     | 6     3     4     | 27    8     5     |
 *-----------------------------------------------------------*


Danny, Sorry to say, but I agree with you that the second step does not complete the puzzle. Not sure just what I did because I was in a rush and did not write good notes. My guess is that instead of making the noted deletions, I set r1c9=7, which does complete the puzzle.

Also in looking at the puzzle again, I realize that r2c8 should have been deleted by clean-up following the first move.

Hopefully I will have some time later this evening to complete the puzzle properly..........

Ted
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Jul 22, 2011 1:44 am    Post subject: Reply with quote
Ok, here is an additional step which I believe completes the puzzle, based on the code posted by Danny.

anp(23=4)r8c98-r56c8=(4-3)r4c7=r4c2-(3=2)r3c2; r8c2<>2

The complete three steps are
Quote:
Kraken x-wing(2)r68c89=(2)r8c2-r23c2=r3c1-r3c6=r1c6; r1c9<>2
anp(47=2)r1c97-(2=7)r9c7-r7c9=r1c9; r1c6,r2c7<>7
anp(23=4)r8c98-r56c8=(4-3)r4c7=r4c2-(3=2)r3c2; r8c2<>2

Ted
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Fri Jul 22, 2011 6:04 am    Post subject: Reply with quote
Following Ted's example! A different uglier and targetted almost-turbot for a one-stepper...
Quote:
almost-skyscraper(2) r9, r2, r2c8 ; r8c2<>2, r3c1<>2
skyscraper(2)[r9c1=r9c7-r2c7=r2c2]
||
(2)r2c8 - r1c79=r1c6 - (2=7)r3c6 -------------------- (37=2)r3c2
(2)r2c8 - (3)r2c8=r2c7 - (3=4)r4c7 - (48=3)r4c42 /
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Jul 22, 2011 1:15 pm    Post subject: Reply with quote
peterj wrote:
Following Ted's example! A different uglier and targetted almost-turbot for a one-stepper...
Quote:
almost-skyscraper(2) r9, r2, r2c8 ; r8c2<>2, r3c1<>2
skyscraper(2)[r9c1=r9c7-r2c7=r2c2]
||
(2)r2c8 - r1c79=r1c6 - (2=7)r3c6 -------------------- (37=2)r3c2
(2)r2c8 - (3)r2c8=r2c7 - (3=4)r4c7 - (48=3)r4c42 /

Peter, you may call it ugly, but I like it when it does a better job..........

Ted
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ronk



Joined: 07 May 2006
Posts: 398
PostPosted: Fri Jul 22, 2011 2:35 pm    Post subject: Reply with quote
peterj wrote:
Following Ted's example! A different uglier and targetted almost-turbot for a one-stepper...

Settling for just one of the eliminations makes it less ugly ... and preserves the one-stepper. Using your notation style ...
Quote:
almost-skyscraper(2) r9, r2, r2c8 ; r3c1<>2
skyscraper(2)[r9c1=r9c7-r2c7=r2c2]
||
(2-3)r2c8=r2c7-r4c7=r4c2-r3c2=r3c1
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Fri Jul 22, 2011 5:25 pm    Post subject: Reply with quote
Ronk, much nicer thanks! Should have seen it - but once you go down one line of thinking sometimes hard to see the alternatives
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Jul 24, 2011 9:17 pm    Post subject: Reply with quote
After a three-day struggle, I managed to cobble together an eight-step solution. Embarassed
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Jul 25, 2011 2:40 am    Post subject: Reply with quote
My solver's best solution:

Code:
 after basics
 +-----------------------------------------------------------------------+
 |  8      5      6      |  3      1      27     |  247    9      247    |
 |  9      247    47     |  5      6      8      |  237    237    1      |
 |  237    237    1      |  9      4      27     |  5      6      8      |
 |-----------------------+-----------------------+-----------------------|
 |  1      348    2      |  48     7      6      |  34     5      9      |
 |  467    9      5      |  1      2      3      |  8      47     467    |
 |  3467   34678  47     |  48     5      9      |  1      2347   23467  |
 |-----------------------+-----------------------+-----------------------|
 |  467    467    3      |  2      8      5      |  9      1      47     |
 |  5      24     8      |  7      9      1      |  6      234    234    |
 |  27     1      9      |  6      3      4      |  27     8      5      |
 +-----------------------------------------------------------------------+
 # 54 eliminations remain

c167\r139 finned  Swordfish              <> 2    r1c9

 <27+4>  XY-Wing  r9c1/r5c1+r8c2         <> 4    r7c1

 <37+2>  XYZ-Wing r2c7/r2c8+r9c7         <> 2    r1c7

XY-Chain: (3=4)r4c7 =7r1c7 =4r1c9 =7r7c9 =6r7c1 =3r6c1  =>  r4c2,r6c89<>3

The finned Swordfish exposed some important basic steps prior to the subsequent advanced steps!
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