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Free Press March 4, 2011

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keith

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

Posted: Fri Mar 04, 2011 2:29 pm Post subject: Free Press March 4, 2011

Not yet started.

Code:

Puzzle: FP030411
+-------+-------+-------+
| 2 . . | . . . | . . . |
| . . 1 | . 9 . | 3 7 . |
| . . 5 | . . 8 | 4 . 6 |
+-------+-------+-------+
| . . 4 | 9 . . | . 2 . |
| . . 6 | . 3 . | 1 . . |
| . 1 . | . . 6 | 5 . . |
+-------+-------+-------+
| 8 . 3 | 4 . . | 2 . . |
| . 4 2 | . 1 . | 7 . . |
| . . . | . . . | . . 3 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith

tlanglet

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

Posted: Fri Mar 04, 2011 4:18 pm Post subject:

One of those "simple" moves........

After basics

Code:

*-----------------------------------------------------------*
| 2 6 79 | 137 47 347 | 89 1589 589 |
| 4 8 1 | 6 9 5 | 3 7 2 |
| 3 79 5 | 127 27 8 | 4 19 6 |
|-------------------+-------------------+-------------------|
| 5 3 4 | 9 8 1 | 6 2 7 |
| 79 2 6 | 5 3 47 | 1 89 489 |
| 79 1 8 | 27 247 6 | 5 3 49 |
|-------------------+-------------------+-------------------|
| 8 79 3 | 4 5 79 | 2 6 1 |
| 6 4 2 | 38 1 39 | 7 589 589 |
| 1 5 79 | 78 6 2 | 89 4 3 |
*-----------------------------------------------------------*

Quote:

ANP(47=3)r1c56-(3=9)r8c6-(9=7)r7c6-r7c2=(7)r3c2; r3c45<>7

Ted

keith

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

Posted: Fri Mar 04, 2011 4:33 pm Post subject:

I had a similar solution:

Quote:

A type 6 UR solves R3C5, R6C4 as 2. A skyscraper on 7 solves R3C4 as 1.

The last elimination can also be deduced from the 58 UR.

Keith

peterj

Joined: 26 Mar 2010
Posts: 974
Location: London, UK

Posted: Fri Mar 04, 2011 7:19 pm Post subject:

A simpler "simple" move...? Wink

Code:

xy-wing(18-9) with als pivot ; (9=1)r3c8 - als(1278)r369c4[(1)r3c4=(8)r9c4] - (8=9)r9c7 ; r1c7<>9, r8c8<>9

Marty R.

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

Posted: Sat Mar 05, 2011 12:14 am Post subject:

R3c4 can be solved =1 by a Finned X-Wing on 7 which overlaps the Type 6.

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Sat Mar 05, 2011 8:03 am Post subject:

peterj wrote:

A simpler "simple" move...? Wink

Code:

xy-wing(18-9) with als pivot ; (9=1)r3c8 - als(1278)r369c4[(1)r3c4=(8)r9c4] - (8=9)r9c7 ; r1c7<>9, r8c8<>9

and just to compliment your xy-wing with als.
here is a xy-wing with UR pivot (doesn't solve puzzle)

Code:

+------------+-------------------+----------------+
| 2 6 79 | 137 47 347 | 89 1589 58-9 |
| 4 8 1 | 6 9 5 | 3 7 2 |
| 3 79 5 | (127) (27) 8 | 4 (19) 6 |
+------------+-------------------+----------------+
| 5 3 4 | 9 8 1 | 6 2 7 |
| 79 2 6 | 5 3 47 | 1 8-9 489 |
| 79 1 8 | (27) (247) 6 | 5 3 (49) |
+------------+-------------------+----------------+
| 8 79 3 | 4 5 79 | 2 6 1 |
| 6 4 2 | 38 1 39 | 7 589 589 |
| 1 5 79 | 78 6 2 | 89 4 3 |
+------------+-------------------+----------------+

(9=1)r3c8 - UR27[(1)r3c4 = (4)r6c5] - (4=9)r6c9; r5c8 and r1c9 <> 9

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