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Menneske SH

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Marty R.

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

Posted: Sat Sep 26, 2009 5:18 am Post subject: Menneske SH

Puzzle 6150734, rated 21.

A strange-looking grid. The only move I've made was a W-Wing on 26 which took the 2 out of r4c1.

Code:

+-------------+---------+---------+
| 3 24 248 | 9 6 28 | 5 7 1 |
| 5 279 289 | 3 1 278 | 6 4 28 |
| 267 1 268 | 4 5 278 | 3 9 28 |
+-------------+---------+---------+
| 68 268 7 | 5 4 1 | 9 26 3 |
| 1 3 26 | 8 7 9 | 4 26 5 |
| 49 5 49 | 6 2 3 | 1 8 7 |
+-------------+---------+---------+
| 89 89 5 | 2 3 4 | 7 1 6 |
| 47 47 3 | 1 8 6 | 2 5 9 |
| 26 26 1 | 7 9 5 | 8 3 4 |
+-------------+---------+---------+

Play this puzzle online at the Daily Sudoku site

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Sat Sep 26, 2009 7:26 am Post subject:

Code:

.---------------.---------------.---------------.
| 3 24 248 | 9 6 28 | 5 7 1 |
| 5 279 289 | 3 1 278 | 6 4 28 |
| 267 1 268 | 4 5 278 | 3 9 28 |
:---------------+---------------+---------------:
| 68 268 7 | 5 4 1 | 9 26 3 |
| 1 3 26 | 8 7 9 | 4 26 5 |
| 49 5 49 | 6 2 3 | 1 8 7 |
:---------------+---------------+---------------:
| 89 89 5 | 2 3 4 | 7 1 6 |
| 47 47 3 | 1 8 6 | 2 5 9 |
| 26 26 1 | 7 9 5 | 8 3 4 |
'---------------'---------------'---------------'

UR on {2,8} r23c39
strong link on the 6 in r2c3 and the 9 in r3c3
(2=6)r5c3 - UR28[(6)r3c3 = (9)r2c3] - (9)r2c2 = (9-8)r7c2 = (8)r4c2; r4c2 <>2

leaves xy-wing (247) removes 7 from r8c1 and r2c2

arkietech

Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

Posted: Sat Sep 26, 2009 12:35 pm Post subject:

Code:

*-----------------------------------------------------------*
| 3 248 248 | 9 6 28 | 5 7 1 |
| 5 2789 289 | 3 1 278 | 6 4 28 |
| 2678 1 268 | 4 5 278 | 3 9 28 |
|-------------------+-------------------+-------------------|
| 268 268 7 | 5 4 1 | 9 26 3 |
| 1 3 26 | 8 7 9 | 4 26 5 |
| 49 5 49 | 6 2 3 | 1 8 7 |
|-------------------+-------------------+-------------------|
| 89 89 5 | 2 3 4 | 7 1 6 |
| 47 47 3 | 1 8 6 | 2 5 9 |
| 26 26 1 | 7 9 5 | 8 3 4 |
*-----------------------------------------------------------*
(4)r8c1=(4-7)r8c2=(7-9)r2c2=(9)r2c3-(9)r6c3=(9-4)r6c1=(4)r8c1 => r8c1=4

A discontinuous nice loop was used to set r8c1=4

Last edited by arkietech on Sat Sep 26, 2009 8:34 pm; edited 1 time in total

Marty R.

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

Posted: Sat Sep 26, 2009 3:45 pm Post subject:

Quote:

strong link on the 6 in r2c3 and the 9 in r3c3

Norm, I think you pointed out a similar strong link situation on a UR in another thread. Would you be kind enough to step me through the logic from the point where strong links are discovered on the non-deadly candidates to the point where an elimination can be done therefrom?

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sat Sep 26, 2009 5:31 pm Post subject:

Marty R. wrote:

Quote:

strong link on the 6 in r3c3 and the 9 in r2c3

First, we need to clear up the typo in Norm's quote. He has it correct in his chain.

Marty R.

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

Posted: Sat Sep 26, 2009 8:03 pm Post subject:

Quote:

First, we need to clear up the typo in Norm's quote. He has it correct in his chain.

Thanks Danny, I understood that there were typos with the positions of the 6 and 9 reversed.

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