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Free Press December 20, 2012 Thu

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keith

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

Posted: Sat Dec 22, 2012 2:40 pm Post subject: Free Press December 20, 2012 Thu

Code:

Puzzle: FP122012Thu
+-------+-------+-------+
| . . 1 | . . . | 9 . . |
| . 9 . | . . 1 | . . . |
| 3 . 7 | . 8 . | 6 . . |
+-------+-------+-------+
| . 4 . | . 7 8 | . . . |
| 6 7 . | 4 . 9 | . 3 5 |
| . . . | 5 3 . | . 7 . |
+-------+-------+-------+
| . . 9 | . 2 . | 7 . 4 |
| . . . | 1 . . | . 9 . |
| . . 6 | . . . | 3 . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Marty R.

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

Posted: Sat Dec 22, 2012 5:07 pm Post subject:

Code:

+------------+--------------+--------------+
| 248 6 1 | 237 45 23457 | 9 2458 37 |
| 248 9 45 | 37 6 1 | 258 2458 37 |
| 3 25 7 | 9 8 245 | 6 1245 12 |
+------------+--------------+--------------+
| 5 4 3 | 26 7 8 | 1 26 9 |
| 6 7 28 | 4 1 9 | 28 3 5 |
| 9 1 28 | 5 3 26 | 4 7 268 |
+------------+--------------+--------------+
| 1 358 9 | 368 2 356 | 7 568 4 |
| 27 238 45 | 1 45 367 | 258 9 268 |
| 247 258 6 | 78 9 457 | 3 1258 128 |
+------------+--------------+--------------+

Play this puzzle online at the Daily Sudoku site

Type 1 UR (37) boxes 23; r1c4<>37

keith

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

Posted: Sat Dec 22, 2012 6:20 pm Post subject:

Marty, there is a 45 pair in R8. Further basics get you here:

Code:

+----------------+----------------+----------------+
| 28 6 1 | 237 5 2347 | 9 248 37 |
| 28 9 4 | 37 6 1 | 5 28 37 |
| 3 5 7 | 9 8 24 | 6 124 12 |
+----------------+----------------+----------------+
| 5 4 3 | 26 7 8 | 1 26 9 |
| 6 7 28 | 4 1 9 | 28 3 5 |
| 9 1 28 | 5 3 26 | 4 7 268 |
+----------------+----------------+----------------+
| 1 *38 9 |*368 2 -356 | 7 56 4 |
| 7 238 5 | 1 4 *36 | 28 9 268 |
| 4 28 6 | 78 9 57 | 3 125 128 |
+----------------+----------------+----------------+

The XYZ-wing -368 is also a one-stepper.

Keith

Marty R.

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

Posted: Sat Dec 22, 2012 10:39 pm Post subject:

Quote:

Marty, there is a 45 pair in R8. Further basics get you here:

As hard as I try, this stuff continues to haunt me. Embarassed

keith

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

Posted: Sat Dec 22, 2012 10:42 pm Post subject:

Marty R. wrote:

Quote:

Marty, there is a 45 pair in R8. Further basics get you here:

As hard as I try, this stuff continues to haunt me. Embarassed

Not at all. Take the gap, as a rugby fan might say.

Keith

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Sun Dec 23, 2012 9:27 pm Post subject:

6-cell Type 2 UR(28)b4,b6,b9 does not make any direct deletions. However, using the internal inferences hits pay dirt: 6r6c9-(6=2)r6c6-2r4c4=2r1c2 6r8c9-(6=5)r7c8-5r7c6=(5-7)r9c6=7r9c4-ANS(37=2)r21c4 => r1c4=2 Ted

Luke451

Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

Posted: Wed Dec 26, 2012 3:25 am Post subject:

tlanglet wrote:

6-cell Type 2 UR(28)b4,b6,b9 does not make any direct deletions. However, using the internal inferences hits pay dirt:

6r6c9-(6=2)r6c6-2r4c4=2r1c2
6r8c9-(6=5)r7c8-5r7c6=(5-7)r9c6=7r9c4-ANS(37=2)r21c4 => r1c4=2

Ted

Ted, I think the (37) AUR does the same thing.

The (28) pattern is a BUG-Lite and the outs are locked, not usually a promising scenario if you're looking for something that can't be found more easily.

Code:

*-----------------------------------------------------------*
| 28 6 1 | 237 5 2347 | 9 248 37 |
| 28 9 4 | 37 6 1 | 5 28 37 |
| 3 5 7 | 9 8 24 | 6 124 12 |
|-------------------+-------------------+-------------------|
| 5 4 3 | 26 7 8 | 1 26 9 |
| 6 7 28 | 4 1 9 | 28 3 5 |
| 9 1 28 | 5 3 26 | 4 7 268 |
|-------------------+-------------------+-------------------|
| 1 38 9 | 368 2 356 | 7 56 4 |
| 7 238 5 | 1 4 36 | 28 9 268 |
| 4 28 6 | 78 9 57 | 3 125 128 |
*-----------------------------------------------------------*

Marty R.

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

Posted: Wed Dec 26, 2012 3:50 am Post subject:

Luke451 wrote:

tlanglet wrote:

Code:

I suspect Ted found a BUG-Lite much more fun than a simple Type 1.

How about a single chain.

(6r6c9=6r8c9)-(6=5)r7c8-(5=36)r78c6-r6c6=r4c4=>r4c8,r6c6<>6

Luke451

Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

Posted: Wed Dec 26, 2012 6:03 pm Post subject:

Marty wrote:

I suspect Ted found a BUG-Lite much more fun than a simple Type 1.

How about a single chain.

(6r6c9=6r8c9)-(6=5)r7c8-(5=36)r78c6-r6c6=r4c4=>r4c8,r6c6<>6

Fun?? This isn't fun, it's sudoku! Very Happy

More to the point, then: there's no need to reference the DP if one wishes to work with (6)r6c9=(6)r8c9. Those 6s are locked.

(BTW, your chain had the puzzle solved after (5=36)r78c6.)

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