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April 3 DB

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat Apr 03, 2010 2:09 pm    Post subject: April 3 DB Reply with quote
The April 3 DB is a real Easter Egg hunt. I had to use four steps after basics, including: coloring, xy-wing, and two xy-chains. Can someone out there find a single bullet. Norm?

Earl

Code:

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

Play this puzzle online at the Daily Sudoku site
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Apr 03, 2010 4:26 pm    Post subject: Reply with quote
Cool!

After basics:
Code:
+-------------------+-------------------+-------------------+
| 36789 1679  13689 | 4     5     2     | 189   37    18    |
| 5     179   189   | 6     79    3     | 189   2     4     |
| 379   2     4     | 8     1     79    | 6     37    5     |
+-------------------+-------------------+-------------------+
| 2     4     57    | 35-7  8     6     | 37    1     9     |
| 69    3     69    | 27    4     1     | 278   5     78    |
| 1     8     57    | 235-7 -379  79    | 23-7  4     6     |
+-------------------+-------------------+-------------------+
| 379   179   2     | 37    6     4     | 5     8     137   |
| 4     5     13    | 9     37    8     | 17    6     2     |
| 3678  67    368   | 1     2     5     | 4     9     37    |
+-------------------+-------------------+-------------------+

Quote:
Type 4 UR 57 takes out 7s in C4. Type 6 UR 27 takes out 7 in C7.

Revealing an XYZ-wing 2-35 that takes out 3 in R6, solving the puzzle.

Keith
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sat Apr 03, 2010 9:21 pm    Post subject: Reply with quote
Here is an AIC one stepper:
Code:
 *--------------------------------------------------------------------*
 | 36789  1679   13689  | 4      5      2      | 189    37     18     |
 | 5      179    189    | 6      79     3      | 189    2      4      |
 | 379    2      4      | 8      1      79     | 6      37     5      |
 |----------------------+----------------------+----------------------|
 | 2      4      57     | 357    8      6      | 37     1      9      |
 | 69     3      69     | 27     4      1      | 278    5      78     |
 | 1      8      57     | 2357   379    79     | 237    4      6      |
 |----------------------+----------------------+----------------------|
 | 379    179    2      | 37     6      4      | 5      8      137    |
 | 4      5      13     | 9      37     8      | 17     6      2      |
 | 3678   67     368    | 1      2      5      | 4      9      37     |
 *--------------------------------------------------------------------*
(7)r7c4=r8c5-(7=1)r8c7-r7c9=(1-9)r7c2=r7c1-r3c1=r3c6-(9=7)r6c6; r456c4<>7
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