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vanhegan 1/28/09 fiendish

 
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Wed Jan 28, 2009 1:34 am    Post subject: vanhegan 1/28/09 fiendish Reply with quote
Code:

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

Play this puzzle online at the Daily Sudoku site
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Wed Jan 28, 2009 3:19 pm    Post subject: Reply with quote
I set a personal record here for no of steps (8) and brilliance. Started with an ER on <9> (C6,Box1) which left an xy wing. Used some more wings and ER’s - but found I had to resort to two extended xy wings (not my forte). In each case I went from xy to yz through five <69> s (if that makes sense). It worked but maybe I just got lucky.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Wed Jan 28, 2009 9:46 pm    Post subject: Reply with quote
this had me looking for a long time. Shocked
Code:
.------------------.------------------.------------------.
| 4     7     69   | 2     19    3    | 5     169   8    |
| 8     2     5    | 179   4     6    | 79    179   3    |
| 69    3     1    | 5     789   89   | 679   2     4    |
:------------------+------------------+------------------:
| 69    8     7    | 4     3     2    | 1     5     69   |
| 5     69    3    | 679   679   1    | 8     4     2    |
| 2     1     4    | 689   689   5    | 37    37    69   |
:------------------+------------------+------------------:
| 3     69    269  | 169   1269  7    | 4     8     5    |
| 7     4     689  | 3     5     89   | 2     69    1    |
| 1     5     2689 | 689   2689  4    | 369   369   7    |
'------------------'------------------'------------------'

x-wing 6
AIC loop... (9=8)r3c6 - (8)r8c6 = (8-6)r8c3 = (6)r1c3 - (6=9)r3c1; r8c3|r3c57 <> 9
xy-wing {6,8,9} removes 9 from r7c45
chain (1=6)r7c4 - (6=9)r7c2 - (9)r7c3 = (9)r1c3 - (9=1)r1c5; r2c4 <> 1
xyz-wing in box 8 {6,8,9} removes 9 from r9c5
chain (6)r5c2 = (6)r7c2 - (6=8)r8c3 - (8)r8c6 = (8)r3c6 - (8=7)r3c5 - (7)r5c5 = (7)r5c4; r5c4 <> 6
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