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Set J Puzzle 50 -- multi-step VH

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Tue Jan 20, 2009 5:19 pm    Post subject: Set J Puzzle 50 -- multi-step VH Reply with quote

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

Play this puzzle online at the Daily Sudoku site

===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====

Can be solved using steps from ...

Basics: Naked/Hidden Single, Naked Pair/Triple, Locked Candidate 1/2

Basics+: Naked Quad, Hidden Pair/Triple/Quad

VH: BUG+1, Remote Pair, UR Type 1, X-Wing, XY-Wing

Advanced: 2-String Kite, Empty Rectangle, Skyscraper, UR Type 2, XYZ-Wing

Extreme: finned X-Wing, Multiple Colors, M-Wing, W-Wing, XY-Chain

VH+AE: multi-step VH plus one Advanced and one Extreme step.

Extreme+: Swordfish, Jellyfish, (but mostly) Chain

Code:
   c14   X-Wing                          <> 5    [r2c35],[r6c23]

 r35     X-Wing                          <> 1    [r146c2],[r6c4]

   c14   X-Wing                          <> 8    [r3c6],[r6c3]   -or-
 r14     X-Wing                          <> 8    [r3c6],[r6c3]

 r6      Naked  Triple                   <> 146  [r6c14]

     b4  Naked  Quad                     <> 1346 [r4c23]
   c2    Naked  Quad                     <> 2456 [r35c2]   extraneous

         UR Type 1 [r89c38]              <> 46   [r9c3]

   c2    Naked  Pair                     <> 46   [r1c2]

         XY-Wing  [r2c3]/[r1c2]+[r2c4]   <> 5    [r1c5],[r2c1]   sufficient
         XY-Wing  [r2c4]/[r1c5]+[r5c4]   <> 1    [r3c4],[r4c5]
         XY-Wing  [r4c3]/[r2c3]+[r4c6]   <> 6    [r2c6]
         XY-Wing  [r5c4]/[r2c4]+[r4c5]   <> 5    [r1c5],[r6c4]
         XY-Wing  [r6c4]/[r2c4]+[r4c6]   <> 6    [r5c4],[r123c6]
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Marty R.



Joined: 12 Feb 2006
Posts: 5178
Location: Rochester, NY, USA

PostPosted: Wed Jan 28, 2009 1:38 am    Post subject: Reply with quote

Type 1 UR on 46

XY-Wing on 485

X-Wing on 5

XY-Wing on 561
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