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Set F Puzzle 22

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sat Dec 06, 2008 7:09 am    Post subject: Set F Puzzle 22 Reply with quote

Swordfish possible.

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

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sun Dec 07, 2008 12:37 am    Post subject: Reply with quote

I used a w-wing <89> with a the hinge/group link as noted by Norm in another post, plus a type 3 UR <19> to finish off this puzzle.

The first move was the difficult one for me to locate.

Ted
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Tue Dec 09, 2008 9:04 pm    Post subject: Reply with quote

tlanglet wrote:
I used a w-wing <89> with a the hinge/group link as noted by Norm in another post, plus a type 3 UR <19> to finish off this puzzle.

The first move was the difficult one for me to locate.

Ted


Ted,

if this is the w-wing to which you refer

Code:
.---------------------.---------------------.---------------------.
| 2      67     3     | 4      789    6789  | 5     #89     1     |
| 57     147    145   | 179    2      13789 |38-9    6      378   |
| 8      167    9     | 5      137    1367  | 4      2      37    |
:---------------------+---------------------+---------------------:
| 3      179    8     | 26     179    179   | 26     5      4     |
| 567    2      45    | 67     358    348   | 1     *378    9     |
| 567    1479   145   | 12679  358    348   |*38    *378    26    |
:---------------------+---------------------+---------------------:
| 4      8      2     | 19     6      159   | 7      39     35    |
| 1      5      6     | 3      79     279   |#89     4      28    |
| 9      3      7     | 8      4      25    | 26     1      256   |
'---------------------'---------------------'---------------------'


then the elimination of that 9 reduces the puzzle to singles.
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Wed Dec 10, 2008 3:55 am    Post subject: Reply with quote

Norm, yes that is the W-wing I used. Sometimes I do not do alot of basic clean-up after each move, especially if I notice another step. I suspect that is what happen in this instance.

Thanks very much for your input and also for pointing out in detail this hinge/group link technique.

Ted
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