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From old collection 3/21/12

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arkietech

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

Posted: Wed Mar 21, 2012 9:20 am Post subject: From old collection 3/21/12

Code:

*-----------*
|.2.|...|.4.|
|7..|...|..6|
|4..|9.7|..5|
|---+---+---|
|...|...|...|
|1..|3.2|..9|
|.3.|576|.8.|
|---+---+---|
|..4|.2.|3..|
|8..|.9.|..2|
|.7.|6.1|.5.|
*-----------*

Play/print online

SudoQ

Joined: 02 Aug 2011
Posts: 127

Posted: Wed Mar 21, 2012 9:47 pm Post subject:

A contradiction network:

Code:

r9c5=3 -> r1(c1=3,c6=8,c4=1,c9=7) -> r7(c6=5,c4=8,c9=1) -> r8(c3=3,c2=5) -> q7<>1

/SudoQ

arkietech

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

Posted: Wed Mar 21, 2012 10:26 pm Post subject:

I liked this one

Code:

*-----------------------------------------------------------------------------*
| 3569 2 135689 | 18 13568 38 | 1789 4 1378 |
| 7 1589 13589 | 2 13458 348 | 189 139 6 |
| 4 168 1368 | 9 1368 7 | 128 123 5 |
|-------------------------+-------------------------+-------------------------|
| 56 4568 5678 | 148 148 9 | 2567 2367 37 |
| 1 4568 5678 | 3 48 2 | 567 67 9 |
|*29 3 *29 | 5 7 6 | 14 8 14 |
|-------------------------+-------------------------+-------------------------|
| 569 1569 4 | 78 2 58 | 3 1679 178 |
| 8 156 156-3 | 47 9 345 | 1467 167 2 |
|*239 7 *239 | 6 48-3 1 | 489 5 48 |
*-----------------------------------------------------------------------------*
ur 29 r69c13 r9c13=3 => r8c3,r9c5<>3

Play/print online

SudoQ

Joined: 02 Aug 2011
Posts: 127

Posted: Wed Mar 21, 2012 11:02 pm Post subject:

arkietech wrote:

I liked this one

Code:

ur 29 r69c13 r9c13=3 => r8c3,r9c5<>3

Me too! This time the UR solution was outstanding!

/SudoQ

Marty R.

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

Posted: Thu Mar 22, 2012 12:20 am Post subject:

I also used the Type 2 UR and thought I made a mistake because I was expecting something requiring more steps.

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