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DB Friday Puzzle: 1 June, 2007

 
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keith



Joined: 19 Sep 2005
Posts: 3162
Location: near Detroit, Michigan, USA

PostPosted: Sat Jun 02, 2007 3:32 pm    Post subject: DB Friday Puzzle: 1 June, 2007 Reply with quote

The Saturday puzzle requires a chain. But. the Friday one is interesting ...
Code:
Puzzle: DB060107  *****
+-------+-------+-------+
| 6 3 . | . 8 . | . . . |
| . . 9 | . . 7 | 3 . . |
| . 2 . | 6 1 . | . 4 . |
+-------+-------+-------+
| . 9 . | . . 5 | . . . |
| 4 . . | . . . | . . 8 |
| . . . | 4 . . | . 3 . |
+-------+-------+-------+
| . 7 . | . 6 4 | . 1 . |
| . . 3 | 7 . . | 6 . . |
| . . . | . 9 . | . 8 5 |
+-------+-------+-------+


Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5152
Location: Rochester, NY, USA

PostPosted: Sat Jun 02, 2007 4:54 pm    Post subject: Reply with quote

Quote:
But. the Friday one is interesting ...


A lousy Friday puzzle!! So easy a caveman could do it!! But Marty couldn't. I used the Type 1 on 18, but that's all I could see. No X, XY or XYZ. Also tried some simple coloring and noted the two almost rectangles involving the 27 pair, but I can't see anything other than resorting to chains.

Code:

+--------------+------------+----------------+
| 6    3  4    | 259 8  29  | 125  257  127  |
| 18   18 9    | 25  4  7   | 3    256  26   |
| 57   2  57   | 6   1  3   | 8    4    9    |
+--------------+------------+----------------+
| 3    9  1278 | 18  27 5   | 4    267  1267 |
| 4    56 127  | 19  3  69  | 1259 2579 8    |
| 278  56 1278 | 4   27 689 | 1259 3    127  |
+--------------+------------+----------------+
| 2589 7  258  | 28  6  4   | 29   1    3    |
| 29   18 3    | 7   5  18  | 6    29   4    |
| 12   4  6    | 3   9  12  | 7    8    5    |
+--------------+------------+----------------+

Play this puzzle online at the Daily Sudoku site
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keith



Joined: 19 Sep 2005
Posts: 3162
Location: near Detroit, Michigan, USA

PostPosted: Sat Jun 02, 2007 5:11 pm    Post subject: Reply with quote

Marty,

There is a quad in R6. It stumped me too.

This is the first non-Saturday puzzle that requires more than the basics. If you don't use the UR, it seems to require a chain.

There is another UR reduction: You can take out <2> in R4C8. The UR on <26> is also an X--wing on <6>.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5152
Location: Rochester, NY, USA

PostPosted: Sat Jun 02, 2007 7:32 pm    Post subject: Reply with quote

Shame on me for not catching that quad. Embarassed
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