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daj95376
Joined: 23 Aug 2008 Posts: 3854
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Posted: Wed Dec 24, 2008 6:38 pm Post subject: Set H Puzzle 2 |
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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 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007 Posts: 2468 Location: Northern California Foothills
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Posted: Wed Dec 24, 2008 7:29 pm Post subject: |
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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.
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Ted |
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Marty R.
Joined: 12 Feb 2006 Posts: 5770 Location: Rochester, NY, USA
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Posted: Wed Dec 24, 2008 11:18 pm Post subject: |
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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
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Posted: Thu Dec 25, 2008 8:12 am Post subject: |
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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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