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Puzzle 10/07/02: XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Jul 02, 2010 3:52 am    Post subject: Puzzle 10/07/02: XY Reply with quote
Code:
 +-----------------------+
 | . . 9 | 1 8 . | . 5 . |
 | . . 3 | . . . | . 2 . |
 | 4 6 5 | . . 2 | . 1 . |
 |-------+-------+-------|
 | 1 . . | 6 . . | 3 . . |
 | 3 . . | . 1 . | . 9 2 |
 | . . 6 | . . 8 | . . 1 |
 |-------+-------+-------|
 | . . . | 8 . . | . . . |
 | 9 3 8 | . 4 . | . . . |
 | . . . | . 2 9 | . . . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

Code:
 after basics
 +--------------------------------------------------------------+
 |  27    27    9     |  1     8     36    |  4     5     36    |
 |  8     1     3     |  459   56    456   |  79    2     679   |
 |  4     6     5     |  39    7     2     |  89    1     389   |
 |--------------------+--------------------+--------------------|
 |  1     2457  247   |  6     9     47    |  3     78    578   |
 |  3     8     47    |  457   1     457   |  6     9     2     |
 |  57    9     6     |  2     3     8     |  57    4     1     |
 |--------------------+--------------------+--------------------|
 |  257   2457  1247  |  8     56    3567  |  1579  37    4579  |
 |  9     3     8     |  57    4     1     |  2     6     57    |
 |  6     457   147   |  357   2     9     |  1578  378   4578  |
 +--------------------------------------------------------------+
 # 67 eliminations remain
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Jul 02, 2010 2:26 pm    Post subject: Reply with quote
Two steps.........

Quote:
x-chain (5): r8c4 = r8c9 - r4c9 = r4c2 - r6c1 = r7c1; r7c56<>5
Almost xy-wing 5-78 with vertex r4c9 and fin (7)r4c9
IF xy-wing is true; r7c8<>7
If fin is true: (7)r4c9 - r4c6 = (7)r7c6; r7c8<>7

Ted
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Fri Jul 02, 2010 5:41 pm    Post subject: Reply with quote
A w-wing with a grouped twist - one stepper...
Quote:
w-wing(57) with grouped SL (5=7)r6c7 - (7)r4c8=r79c8 - (7=5)r8c9; r4c9<>5, r79c7<>5
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Jul 02, 2010 7:24 pm    Post subject: Reply with quote
peterj wrote:
A w-wing with a grouped twist - one stepper...
Quote:
w-wing(57) with grouped SL (5=7)r6c7 - (7)r4c8=r79c8 - (7=5)r8c9; r4c9<>5, r79c7<>5


Nice spot.......

Ted
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