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Puzzle 11/08/11: ~ Advanced

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu Aug 11, 2011 6:21 am    Post subject: Puzzle 11/08/11: ~ Advanced Reply with quote
Code:
 +-----------------------+
 | . 1 8 | 7 5 . | . 2 9 |
 | 7 . 5 | 9 8 . | 4 . 1 |
 | 3 9 . | 1 2 . | . 8 . |
 |-------+-------+-------|
 | 2 3 1 | . 9 . | . . 4 |
 | 6 7 9 | 4 1 . | . . . |
 | . . . | . . . | . . . |
 |-------+-------+-------|
 | . 8 . | . . . | . . . |
 | 9 . 2 | . . . | . 4 . |
 | 1 4 . | 5 . . | . . 2 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
PostPosted: Thu Aug 11, 2011 5:27 pm    Post subject: Reply with quote
1. 8s: r4c4=r8c4-r8c9=r5c9 =>r5c6<>8
Code:
 *--------------------------------------------------*
 | 4    1    8    | 7    5    6    | 3    2    9    |
 | 7    2    5    | 9    8    3    | 4    6    1    |
 | 3    9    6    | 1    2    4    | 57   8    57   |
 |----------------+----------------+----------------|
 | 2    3    1    | 68   9    78   | 67   5    4    |
 | 6    7    9    | 4    1    5    | 2    3    8    |
 | 8    5    4    | 236  367  27   | 19   19   67   |
 |----------------+----------------+----------------|
 | 5    8   @37   | 236  4    129  | 19+6 19+7 @36  |
 | 9    6    2    | 38   37   178  | 158  4    35   |
 | 1    4    37   | 5    36   89   | 689  79   2    |
 *--------------------------------------------------*

2. Type 3 UR (19)r67c78 =>r7c4<>36

Almost called it a “quantum naked triple” until I remembered it already has a name ...
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Aug 14, 2011 1:02 am    Post subject: Reply with quote
I played a Type 4 UR (57), XY-Wing (386) and XYZ-Wing (678) to little avail. Then an external analysis on the 19 UR. R7c6 had to be 1 or 9. Common outcomes; r56c6=52. My grid was much more cluttered than Luke's.
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Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
PostPosted: Sun Aug 14, 2011 2:35 am    Post subject: Reply with quote
Marty, mine was much more crowded as well. The grid posted is after move 1. Next time I'll make that more clear.
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