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Set H Puzzle 2

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Wed Dec 24, 2008 6:38 pm    Post subject: Set H Puzzle 2 Reply with quote
Code:
 +-----------------------+
 | 1 . 9 | . . . | . 4 . |
 | . . . | . . 9 | 7 . 1 |
 | 4 . . | . . 1 | 8 . . |
 |-------+-------+-------|
 | . . . | 8 . . | 1 5 . |
 | . . . | . 4 . | . . . |
 | . 5 6 | . . 3 | 4 . . |
 |-------+-------+-------|
 | . 7 4 | 3 . 6 | 5 . . |
 | 5 . . | 1 . . | . 8 . |
 | . 6 . | . . . | . . 7 |
 +-----------------------+

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: Wed Dec 24, 2008 7:29 pm    Post subject: Reply with quote
Another very interesting BBDB puzzle that had the same infrequent pattern to delete several digits involving eight steps to complete.
Quote:
In order, I had a ER <3>, coloring <4> with multiple deletions, ER <3>, hidden UR <45>, kite <8>, coloring <8> with multiple deletions, xy-wing <268> and coloring <6> with multiple deletions.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Dec 24, 2008 11:18 pm    Post subject: Reply with quote
I used three steps.

Quote:
XY-Wing Chain 59-56-56-56-69
Type 4 UR (79)
XY-Wing (679) with pincer transport
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Thu Dec 25, 2008 8:12 am    Post subject: Reply with quote
Code:
.------------------.------------------.------------------.
| 1     23    9    | 7     56    8    | 23    4     56   |
| 6     8     5    | 4     23    9    | 7     23    1    |
| 4     23    7    | 56    23    1    | 8     69    569  |
:------------------+------------------+------------------:
| 39    4     2    | 8     69    7    | 1     5     369  |
| 379   1     8    | 269   4     5    | 29    2679  2369 |
| 79    5     6    | 29    1     3    | 4     279   8    |
:------------------+------------------+------------------:
| 28    7     4    | 3     89    6    | 5     1     29   |
| 5     9     3    | 1     7     2    | 6     8     4    |
| 28    6     1    | 59    589   4    | 239   239   7    |
'------------------'------------------'------------------'

Quote:
don't forget the extended w-wing strong links on 6 in column 4 connecting the (6,9) cells.
extend the 9 from r4c5 down to r7c5 over to r7c9... this eliminates the 9 in r3c9, solves the puzzle.
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