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Jan 5 DB

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

PostPosted: Sun Jan 06, 2008 10:39 pm    Post subject: Jan 5 DB Reply with quote

Here is the Jan 5 DB
A skyscraper (7) did it for me.

Earl


Code:

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

Play this puzzle online at the Daily Sudoku site
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Johan



Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium

PostPosted: Sun Jan 06, 2008 11:52 pm    Post subject: Reply with quote

An Empty Rectangle in Box 6 for digit <7>, takes out <7> in R1C7 was the final step for me. The eri can see one of the strong link* on <7> in C3
Code:

+--------------------------+--------------------------+--------------------------+
| 248         2478    *27  | 9           3        6   |-[7]8       1        5    |
| 9           78       3   | 1           28       5   | 4          278      6    |
| 6           5        1   | 7           4        28  | 9          28       3    |
+--------------------------+--------------------------+--------------------------+
| 124         247      5   | 48          6        9   | 78      er 3     er 124  |
| 14          6        8   | 2           7        3   | 5       er 9     er 14   |
| 3           9       *27  | 48          5        1   | 6 eri      78       24   |
+--------------------------+--------------------------+--------------------------+
| 7           3        6   | 5           28       28  | 1          4        9    |
| 5           1        4   | 3           9        7   | 2          6        8    |
| 28          28       9   | 6           1        4   | 3          5        7    |
+--------------------------+--------------------------+--------------------------+   
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Mon Jan 07, 2008 12:22 am    Post subject: Reply with quote

UR type 2b {1,4} in r45c19 takes out 2 in r4c2

then xy-wing pincers in r1c3 and r9c2 28-78-27 takes out 7 in r1c2

of course the skyscraper is there to avoid all those steps.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Mon Jan 07, 2008 1:36 am    Post subject: Reply with quote

Just another approach--I used the Type 1 UR on 28, then a W-Wing on 78, followed by pincer coloring on that same W-Wing.
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