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Free Press January 25, 2013

 
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keith



Joined: 19 Sep 2005
Posts: 3173
Location: near Detroit, Michigan, USA

PostPosted: Sat Jan 26, 2013 1:27 pm    Post subject: Free Press January 25, 2013 Reply with quote

More challenging than last week ...
Code:
Puzzle: FP012513
+-------+-------+-------+
| . . . | . 5 1 | . . 4 |
| . . . | 7 . . | . 8 . |
| . . 9 | . . 3 | 7 . 6 |
+-------+-------+-------+
| 5 . . | . . 7 | . . 1 |
| . . . | . . . | . 5 . |
| 4 . . | 5 . . | . . 2 |
+-------+-------+-------+
| 9 . 1 | 3 . . | 8 . . |
| . 8 . | . . 9 | . . . |
| 3 . . | 4 1 . | . . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sat Jan 26, 2013 2:53 pm    Post subject: Reply with quote

Code after basics:
Code:
*-----------------------------------------------------------*
 | 8     2367  2367  | 69    5     1     | 239   239   4     |
 | 16    346   346   | 7     69    2     | 1359  8     359   |
 | 12    5     9     | 8     4     3     | 7     12    6     |
 |-------------------+-------------------+-------------------|
 | 5     2369  2368  | 29    2389  7     | 3469  3469  1     |
 | 7     2369  236   | 1     239   4     | 369   5     8     |
 | 4     1     38    | 5     389   6     | 39    7     2     |
 |-------------------+-------------------+-------------------|
 | 9     246   1     | 3     26    5     | 8     246   7     |
 | 26    8     45    | 26    7     9     | 1345  134   35    |
 | 3     267   2567  | 4     1     8     | 2569  269   59    |
 *-----------------------------------------------------------*

Initially, I could not refuse the coloring(6), which resulted in the following code.

Code:
 *-----------------------------------------------------------*
 | 8     37    37    | 6     5     1     | 2     9     4     |
 | 1     46    46    | 7     9     2     | 35    8     35    |
 | 2     5     9     | 8     4     3     | 7     1     6     |
 |-------------------+-------------------+-------------------|
 | 5     236   2368  | 9     238   7     | 4     36    1     |
 | 7     9     236   | 1     23    4     | 36    5     8     |
 | 4     1     38    | 5     38    6     | 9     7     2     |
 |-------------------+-------------------+-------------------|
 | 9     24    1     | 3     6     5     | 8     24    7     |
 | 6     8     45    | 2     7     9     | 1     34    35    |
 | 3     27    257   | 4     1     8     | 56    26    9     |
 *-----------------------------------------------------------*

Then I found this Almost AIC:
AAIC with (25=7)r9c3
[(4=2)r7c2-(2=5)r9c3-(5=6)r9c7-r5c7=r5c3-(6=4)r2c3 => r2c2<4> r2c2<4> r2c2<>4

I also made a quick second pass but did not find a better solution. Overall, this was a harder than normal Free Press puzzle for me.

Ted
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keith



Joined: 19 Sep 2005
Posts: 3173
Location: near Detroit, Michigan, USA

PostPosted: Sat Jan 26, 2013 4:21 pm    Post subject: Reply with quote

In Ted's second grid there is a 38 UR, taking out 3 in R4C35.
Code:
+-------------+-------------+-------------+
| 8   37  37  | 6   5   1   | 2   9   4   |
| 1   46  46  | 7   9   2   | 35  8   35  |
| 2   5   9   | 8   4   3   | 7   1   6   |
+-------------+-------------+-------------+
| 5   236 268 | 9   28  7   | 4   36  1   |
| 7   9   236 | 1   23  4   | 36  5   8   |
| 4   1   38  | 5   38  6   | 9   7   2   |
+-------------+-------------+-------------+
| 9   24  1   | 3   6   5   | 8   24  7   |
| 6   8   45  | 2   7   9   | 1   34  35  |
| 3   27  257 | 4   1   8   | 56  26  9   |
+-------------+-------------+-------------+

Note the DP 28 23 38 in R456C35. One of R45C3 must be 6, solving R2C3 as 4, and the puzzle.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Sat Jan 26, 2013 5:52 pm    Post subject: Reply with quote

I used:

Coloring on 6
DP 27-37-23, common outcomes
UR 38
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