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Free Press February 15, 2013

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keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Fri Feb 15, 2013 4:18 pm Post subject: Free Press February 15, 2013

Code:

Puzzle: FP021513
+-------+-------+-------+
| . . 6 | 1 . 9 | . . . |
| . . 7 | . . . | . . 9 |
| . . 9 | 2 . . | 7 . 8 |
+-------+-------+-------+
| . 7 . | . . 1 | . 3 . |
| . . . | . 4 . | . . . |
| . 8 . | 7 5 . | . 2 . |
+-------+-------+-------+
| 5 . 8 | . . . | 3 . . |
| 4 . . | . . . | 6 . . |
| . . . | 8 . 4 | 1 . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith

Marty R.

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

Posted: Fri Feb 15, 2013 9:09 pm Post subject:

Code:

+---------------+------------+--------------+
| 8 25 6 | 1 7 9 | 245 45 3 |
| 123 1235 7 | 4 368 38 | 25 16 9 |
| 13 4 9 | 2 36 5 | 7 16 8 |
+---------------+------------+--------------+
| 26 7 245 | 9 28 1 | 458 3 456 |
| 1269 12 125 | 3 4 28 | 589 57 1567 |
| 139 8 134 | 7 5 6 | 49 2 14 |
+---------------+------------+--------------+
| 5 129 8 | 6 129 27 | 3 479 247 |
| 4 1239 123 | 5 1239 237 | 6 8 27 |
| 7 6 23 | 8 239 4 | 1 59 25 |
+---------------+------------+--------------+

Play this puzzle online at the Daily Sudoku site

I wasted a lot of time with the DP 13-36-16 in band 1 which eliminated the 2 in r4c1, but that didn't open up anything. Then I noticed the 27 UR in b89.

(4r7c9=3r8c6)-r8c23=r9c3-r6c3=r6c1-(13=2)r32c1-(2=5)r2c7-(5=4)r1c8-r7c8=r7c9=>r7c8,r46c9<>4

That brings us here:

Code:

+---------------+------------+-----------+
| 8 25 6 | 1 7 9 | 25 4 3 |
| 123 1235 7 | 4 368 38 | 25 16 9 |
| 13 4 9 | 2 36 5 | 7 16 8 |
+---------------+------------+-----------+
| 26 7 245 | 9 28 1 | 48 3 56 |
| 1269 12 125 | 3 4 28 | 89 57 567 |
| 139 8 134 | 7 5 6 | 49 2 1 |
+---------------+------------+-----------+
| 5 129 8 | 6 129 27 | 3 79 247 |
| 4 1239 123 | 5 1239 237 | 6 8 27 |
| 7 6 23 | 8 239 4 | 1 59 25 |
+---------------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

The Type 1 UR on 25 in b13 finishes it off.

Last edited by Marty R. on Fri Feb 15, 2013 9:21 pm; edited 1 time in total

JC Van Hay

Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

Posted: Fri Feb 15, 2013 9:15 pm Post subject:

Solving row 3 or the XWing(3C26) : r3c1=3 or r8c2=3=r2c6 ->contradiction (no 5R4) :=> r1c5=3 or r8c6=3=r2c2;ste

Interpretation :

Code:

+--------------------+----------------+-------------------+
| 8 25 6 | 1 7 9 | 245 45 3 |
| 123 1235 7 | 4 368 -3(8) | 25 16 9 |
| 1(3) 4 9 | 2 6(3) 5 | 7 16 8 |
+--------------------+----------------+-------------------+
| 26 7 2(45) | 9 28 1 | 4(58) 3 46(5) |
| 1269 12 125 | 3 4 2(8) | 59(8) 57 1567 |
| 19(3) 8 1(34) | 7 5 6 | 49 2 14 |
+--------------------+----------------+-------------------+
| 5 129 8 | 6 129 27 | 3 479 247 |
| 4 1239 123 | 5 1239 237 | 6 8 27 |
| 7 6 (23) | 8 239 4 | 1 59 (25) |
+--------------------+----------------+-------------------+
Chain[8] : Kraken 5R4 : 8r2c6=3r3c5 :=> -3r2c6;ste

(5-8)r4c7=8r5c7-8r5c6=8r2c6
||
[(5-4)r4c3=4r6c3 or 5r4c9-(5=2)r9c9-(2=3)r9c3]-3r6c3=3r6c1-3r2c1=3r3c5

keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Mon Jul 01, 2013 7:58 pm Post subject:

(Note date on original post.)

Marty,

You gave up too soon! After basics:

Code:

+----------------+----------------+----------------+
| 8 25 6 | 1 7 9 | 245 45 3 |
| 123 1235 7 | 4 368 38 | 25 16 9 |
| 13 4 9 | 2 36 5 | 7 16 8 |
+----------------+----------------+----------------+
| 26 7 245 | 9 28 1 | 458 3 456 |
| 1269 12 125 | 3 4 28 | 589 57 1567 |
| 139 8 134 | 7 5 6 | 49 2 14 |
+----------------+----------------+----------------+
| 5 129 8 | 6 129 27 | 3 479 247 |
| 4 1239 123 | 5 1239 237 | 6 8 27 |
| 7 6 23 | 8 239 4 | 1 59 25 |
+----------------+----------------+----------------+

Note the DP 16-13-36 in R23. Either R2C1=2 or R2C5=8. Eliminating 2 in R4C1.

Code:

+----------------+----------------+----------------+
| 8 25 6 | 1 7 9 | 245 45 3 |
| 123 1235 7 | 4 368 38 | 25 16 9 |
| 13 4 9 | 2 36 5 | 7 16 8 |
+----------------+----------------+----------------+
| 6 7 2-45 | 9 28 1 | 458 3 D45 |
| 129 12 125 | 3 4 28 | 589 7 6 |
| 39 8 A34 | 7 5 6 |-49 2 1 |
+----------------+----------------+----------------+
| 5 129 8 | 6 129 27 | 3 49 247 |
| 4 1239 123 | 5 1239 237 | 6 8 27 |
| 7 6 B23 | 8 239 4 | 1 59 C25 |
+----------------+----------------+----------------+

AD are pincers on 4.

Keith

Marty R.

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

Posted: Mon Jul 01, 2013 11:38 pm Post subject:

Quote:

You gave up too soon!

Are you seeing a pattern here? Embarassed

keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Mon Jul 01, 2013 11:59 pm Post subject:

Marty R. wrote:

Quote:

You gave up too soon!

Are you seeing a pattern here? Embarassed

Marty,

No! I was just remarking that your baroque chain proving R6C9 = 1 is a result of the DP elimination of 2 in R4C1 that you did not pursue.

You might also note it has taken me over three months to get to this one.

Keith

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