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Set XY_03 Puzzle 023

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Jun 30, 2009 8:51 am    Post subject: Set XY_03 Puzzle 023 Reply with quote
Code:
 +-----------------------+
 | . . 6 | . . 2 | 8 . . |
 | . 1 5 | 3 4 . | . 6 . |
 | 7 2 . | . . 1 | . 5 4 |
 |-------+-------+-------|
 | . 4 . | 5 . 7 | . . . |
 | . 6 . | . 1 . | . . . |
 | 3 . 9 | 2 . . | 4 . 7 |
 |-------+-------+-------|
 | 5 . . | . . 4 | 6 . . |
 | . 7 4 | . . . | . . . |
 | . . 3 | . . 5 | . . . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

Code:
   c2b7  Locked Pair                     <> 89   [r89c1]
 r9      Naked  Pair                     <> 89   [r9c147]

         UR Type 1 [r79c29]              <> 89   [r7c9]

 r9  b4  Empty Rectangle                 <> 2    [r4c7]

 r59     X-Wing                          <> 2    [r4c1],[r8c17]

 W-Wing: 6/1 in r8c1,r9c4 connected by 1 in r7c34 => r8c45,r9c1<>6
 Bivalue Universal Grave + 1 => r8c9<>5, r8c9<>9
 +--------------------------------------------------------------+
 |  4     3     6     |  7     5     2     |  8     9     1     |
 |  9     1     5     |  3     4     8     |  7     6     2     |
 |  7     2     8     |  69    69    1     |  3     5     4     |
 |--------------------+--------------------+--------------------|
 |  18    4     12    |  5     3     7     |  9     28    6     |
 |  28    6     7     |  4     1     9     |  25    3     58    |
 |  3     5     9     |  2     8     6     |  4     1     7     |
 |--------------------+--------------------+--------------------|
 |  5     89    12    |  189   29    4     |  6     7     3     |
 |  16    7     4     |  1689  269   3     |  15    28    589   |
 |  126   89    3     |  16    7     5     |  12    4     89    |
 +--------------------------------------------------------------+
 # 29 eliminations remain


Last edited by daj95376 on Wed Jul 08, 2009 3:12 pm; edited 1 time in total
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Tue Jun 30, 2009 11:58 am    Post subject: Reply with quote
Two steps:
Quote:
Type 1 UR 89, which opens up an
extended xy-wing 892 with pivot 89 in r9c9 and the strong link on 9 in col2. As a chain, (2=8)r8c8 - (8=9)r9c9 - (9)r9c2 = (9)r7c2 - (9=2)r7c5; r8c5<>2

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri Jul 03, 2009 1:27 am    Post subject: Reply with quote
I opened with the UR, used two ERs on 2, one coloring on 2 and finished with the same chain, 29-89-89-89-28. I learned the latter as "XY-Wing Chain", so that's what I still call it.
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