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5/30/2007 One-Trick Pony

 
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rep'nA
Hooked
Hooked


Joined: 19 Jan 2007
Posts: 49
Location: Union City, California

PostPosted: Wed May 30, 2007 10:56 pm    Post subject: 5/30/2007 One-Trick Pony Reply with quote

While the puzzle is not terribly difficult (a UR and an xy-wing will solve it), it is aesthetically pleasing (well done Ruud) and also gives a very nice example of the broken wing pattern.

Before any advanced moves (nothing more than naked pairs), one gets to

Code:

.------------------.------------------.------------------.
| 4     8     1    | 35    37    57   | 2     9     6    |
| 5     3     9    | 468   28    246  | 7     48    1    |
| 7     6     2    | 489   189   14   | 48    5     3    |
:------------------+------------------+------------------:
| 18    457*  347& | 2     6     9    | 1348  1478& 457  |
| 89    25    67*  | 1     4     3    | 89    67*   25   |
| 19    24    36   | 7     5     8    | 139   16    24   |
:------------------+------------------+------------------:
| 6     9     47   | 45    127   12457| 14    3     8    |
| 2     47*   8    | 346   137&  1467&| 5     147*  9    |
| 3     1     5    | 89    89    47-  | 6     2     47   |
'------------------'------------------'------------------'


The *'d cells would form an impossible odd loop if not for the guardian (&) cells. But r9c6-7-r9c9=7=r4c9 and hence r9c6<>7, solving the puzzle.
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