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Set XY_03 Puzzle 022

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Jun 26, 2009 5:37 pm    Post subject: Set XY_03 Puzzle 022 Reply with quote
Code:
 +-----------------------+
 | 5 . 9 | . 6 2 | . 3 . |
 | . 8 4 | . 9 . | 5 . . |
 | 3 7 . | 5 . . | . . 4 |
 |-------+-------+-------|
 | . . 1 | 8 . . | . . 9 |
 | 6 4 . | . 1 . | . . . |
 | 9 . . | . . 4 | . 1 . |
 |-------+-------+-------|
 | . 9 . | . . . | 6 . . |
 | 4 . . | . . 9 | . 7 . |
 | . . 2 | 6 . . | . . . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

Note: I'm going to add solutions to most puzzles over a week old. The head post will be updated so as not to make them active again.

Code:
   c1b7  Locked Pair                     <> 18   [r8c3]
 r5  b6  Locked Candidate 2              <> 2    [r4c78],[r6c7]
 r8  b9  Locked Candidate 2              <> 8    [r7c89],[r9c789]
 r9      Naked  Pair                     <> 35   [r9c5678]

 r9  b4  Empty Rectangle                 <> 3    [r5c9]   complementary
   c3b6  Empty Rectangle                 <> 3    [r8c7]         "
 c68r7   Skyscraper                      <> 5    [r4c5],[r5c9]
 c36\r58 Sashimi X-Wing                  <> 5    [r8c5]

   c5    Naked  Pair                     <> 23   [r67c5]
     b8  Naked  Triple                   <> 123  [r7c6]
 r7  b8  Locked Candidate 1              <> 5    [r7c9]

 c35r8   Skyscraper                      <> 3    [r4c2],[r5c6]
 r4  b7  turbot fish/ER                  <> 3    [r8c5]

 BUG+2
 [r5c7]=7 => [r5c9]=2 => [r7c9]=3 => [r9c9]<>3
 [r8c9]=3                         => [r9c9]<>3
 +-----------------------------------------------------+
 |  5    1    9    |  4    6    2    |  78   3    78   |
 |  2    8    4    |  7    9    3    |  5    6    1    |
 |  3    7    6    |  5    8    1    |  29   29   4    |
 |-----------------+-----------------+-----------------|
 |  7    2    1    |  8    3    6    |  4    5    9    |
 |  6    4    35   |  9    1    57   |  23+7 8    27   |
 |  9    35   8    |  2    57   4    |  37   1    6    |
 |-----------------+-----------------+-----------------|
 |  18   9    7    |  13   45   58   |  6    24   23   |
 |  4    6    35   |  13   2    9    |  18   7    58+3 |
 |  18   35   2    |  6    47   78   |  19   49   5-3  |
 +-----------------------------------------------------+
 # 30 eliminations remain


Last edited by daj95376 on Wed Jul 08, 2009 2:58 pm; edited 2 times in total
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sun Jun 28, 2009 3:00 pm    Post subject: Reply with quote
A very nice VH puzzle. I am not sure what was required, but my five steps were
Quote:
Remote pair 35,
xyz-wing 237,
ER 3,
Kite 5,
Bug+2 forces r5c3=3.

Ted
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Mon Jun 29, 2009 7:40 am    Post subject: Reply with quote
remote naked pair 35
sky 5
sky 3
BUG+2
BUG[(7)r5c7 = (3)r8c9] - (3=2)r7c9 - (2=7)r5c9; r6c7 <> 7
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Jun 29, 2009 1:56 pm    Post subject: Reply with quote
Impressive use of a chain Norm. I performed a forcing net.

Code:
 BUG+2
 [r5c7]=7 => [r5c9]=2 => [r7c9]=3 => [r9c9]<>3
 [r8c9]=3                         => [r9c9]<>3
 +-----------------------------------------------------+
 |  5    1    9    |  4    6    2    |  78   3    78   |
 |  2    8    4    |  7    9    3    |  5    6    1    |
 |  3    7    6    |  5    8    1    |  29   29   4    |
 |-----------------+-----------------+-----------------|
 |  7    2    1    |  8    3    6    |  4    5    9    |
 |  6    4    35   |  9    1    57   |  23+7 8    27   |
 |  9    35   8    |  2    57   4    |  37   1    6    |
 |-----------------+-----------------+-----------------|
 |  18   9    7    |  13   45   58   |  6    24   23   |
 |  4    6    35   |  13   2    9    |  18   7    58+3 |
 |  18   35   2    |  6    47   78   |  19   49   5-3  |
 +-----------------------------------------------------+
 # 30 eliminations remain
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Tue Jun 30, 2009 9:51 pm    Post subject: Reply with quote
thank you.
I like it when a BUG+2 shows up.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Jul 02, 2009 1:15 am    Post subject: Reply with quote
X-Wing (8), Remote Pairs (35), XYZ (237), ERs (3, 5) and BUG+2. It's all the same, but I saw the BUG as if r8c9=3, then r5c9=7, forcing r5c6<>7.
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