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Two Puzzles

 
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keith



Joined: 19 Sep 2005
Posts: 3178
Location: near Detroit, Michigan, USA

PostPosted: Sat Jan 28, 2006 2:14 pm    Post subject: Two Puzzles Reply with quote

The David Bodycombe puzzles are published in my local paper, the Detroit Free Press. The one from yesterday (1/27) was rated 5 stars. It is not particularly difficult, but it is the first daily newspaper puzzle I have seen which requires a little more than basic techniques. Here it is:

Code:

Puzzle: DB012706
+-------+-------+-------+
| 2 5 . | 8 . . | . . . |
| . . . | . 9 . | 8 . 2 |
| 9 . . | 4 . 7 | . . . |
+-------+-------+-------+
| 6 4 . | . . . | . 9 . |
| . 9 . | 1 . 3 | . 4 . |
| . 7 . | . . . | . 2 1 |
+-------+-------+-------+
| . . . | 5 . 4 | . . 7 |
| 7 . 6 | . 8 . | . . . |
| . . . | . . 1 | . 8 3 |
+-------+-------+-------+


The Saturday puzzle is rated six stars, and usually requires more than the basics. Here is the one from today:

Code:

Puzzle: DB012806
+-------+-------+-------+
| 2 . . | . . . | . . . |
| 7 1 6 | . . . | . . . |
| 5 . . | 6 . . | 1 7 9 |
+-------+-------+-------+
| . 7 . | 1 . 3 | . . . |
| . . 2 | 5 . 6 | 4 . . |
| . . . | 2 . 8 | . 9 . |
+-------+-------+-------+
| 8 9 5 | . . 4 | . . 1 |
| . . . | . . . | 2 4 3 |
| . . . | . . . | . . 5 |
+-------+-------+-------+


Happy puzzling!

Keith
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someone_somewhere



Joined: 07 Aug 2005
Posts: 275
Location: Munich

PostPosted: Sun Jan 29, 2006 8:08 am    Post subject: Reply with quote

Hi,

after setting 22 digits in the:
Code:
  2 5 . 8 . . . . .
  . . . . 9 . 8 . 2
  9 . . 4 . 7 . . .
  6 4 . . . . . 9 .
  . 9 . 1 . 3 . 4 .
  . 7 . . . . . 2 1
  . . . 5 . 4 . . 7
  7 . 6 . 8 . . . .
  . . . . . 1 . 8 3

I started from digit 5 in r3c9.
1. path - 5 <> r4c9, 5 = r4c5, 5 <> r5c5
2. path - 6 = r5c9, 6 <> r5c5
and from both pathes there is no digit left to be set in r5c5 !
meaning we can exclude 5 from r3c9.

the rest is standard techniques.

see u,
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someone_somewhere



Joined: 07 Aug 2005
Posts: 275
Location: Munich

PostPosted: Sun Jan 29, 2006 8:25 am    Post subject: Reply with quote

Hi,
The second one is also nice:
Code:
  2 . . . . . . . .
  7 1 6 . . . . . .
  5 . . 6 . . 1 7 9
  . 7 . 1 . 3 . . .
  . . 2 5 . 6 4 . .
  . . . 2 . 8 . 9 .
  8 9 5 . . 4 . . 1
  . . . . . . 2 4 3
  . . . . . . . . 5

after setting 23 digits with standard techniques,
I start with digit 4 from r4c3:
1. path - 4 <> r4c1
2. path - 4 <> r4c5, 9 = r4c5, 9 <> r4c1
3. path - 4 <> r6c1, 6 = r6c1, 6 <> r4c1
and now there are no digits left for the cell r6c1,
and this means that we can exclude 4 from r4c3.

see u,

P.S. I was one week in Hitchin, but the air from UK did not seem to impact on my weekend Sudoku Wink
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