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Set H Puzzle 18

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Dec 28, 2008 6:49 pm    Post subject: Set H Puzzle 18 Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Mon Dec 29, 2008 10:54 am    Post subject: Reply with quote

Code:
.------------------.------------------.------------------.
| 6     3     2    | 79   #19    45   |#17    8     45   |
| 1     4     7    | 6     8     35   | 9     2     35   |
| 5     9     8    | 347  #14    2    | 1467  13    346  |
:------------------+------------------+------------------:
| 7     8     3    | 1     5     9    | 24    6     24   |
| 9     2     5    | 8    #46    46   | 3     7     1    |
| 4     6     1    | 2     3     7    | 5     9     8    |
:------------------+------------------+------------------:
| 3     7     469  | 49    2     1    | 8     5     69   |
| 8     1     69   | 5     7     36   | 26    4     2369 |
| 2     5     469  | 349  4-69   8    |#16    13    7    |
'------------------'------------------'------------------'

the strong links on 1 in row 1 see the {1,4} cell in r3c5 and the {1,6} cell in r9c7, tells us that either 4 or 6 is true. a little extension to the 4 in r5c5 and the 6 is true there. eliminates the 6 in r9c5, singles from there.

(6=1)r9c7 - (1)r1c7 = (1)r1c5 - (1=4)r3c5 - (4=6)r5c5; r9c5 <> 6
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Mon Dec 29, 2008 2:49 pm    Post subject: Reply with quote

No elegant solution for me - I had to work hard for this one.
A type 6 UR on <69> left an xy wing on <469>
Colouring removed the <3> from R3C9 leaving a very wide xy wing for <469>
An xy wing <137> left a triple to finish it off.

Good one!
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Marty R.



Joined: 12 Feb 2006
Posts: 5065
Location: Rochester, NY, USA

PostPosted: Wed Dec 31, 2008 5:57 am    Post subject: Reply with quote

It wasn't hard work, but I used a half-dozen assorted moves which led to a BUG+1.
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