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Free Press April 19, 2013

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keith

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

Posted: Mon Apr 22, 2013 4:19 am Post subject: Free Press April 19, 2013

Somewhat tougher?

Code:

Puzzle: FP041913
+-------+-------+-------+
| . . . | . 2 . | . . 1 |
| . . . | . . 6 | 2 . . |
| 1 7 . | . 5 . | 4 . 6 |
+-------+-------+-------+
| . . 3 | 2 . . | 1 . 7 |
| . . 9 | . . . | 6 . . |
| 2 . . | . . 8 | 9 . . |
+-------+-------+-------+
| 4 . . | . 1 . | . 3 2 |
| . . 1 | 9 . . | . . . |
| 7 . . | . 8 . | . . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith

Marty R.

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

Posted: Mon Apr 22, 2013 4:02 pm Post subject:

Code:

+------------+------------+-----------+
| 689 68 45 | 478 2 479 | 3 589 1 |
| 389 38 45 | 1 49 6 | 2 7 58 |
| 1 7 2 | 38 5 39 | 4 89 6 |
+------------+------------+-----------+
| 568 568 3 | 2 49 49 | 1 58 7 |
| 58 4 9 | 357 37 1 | 6 2 358 |
| 2 1 7 | 35 6 8 | 9 4 35 |
+------------+------------+-----------+
| 4 9 8 | 6 1 5 | 7 3 2 |
| 35 235 1 | 9 37 237 | 8 6 4 |
| 7 23 6 | 34 8 234 | 5 1 9 |
+------------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

Didn't see a good non-chain solution.

(5=8)r4c8-r5c9=r2c9-(8=3)r2c2-(32=5)r98c2=>r4c2<>5

Code:

+-----------+----------+----------+
| 689 68 45 | 48 2 7 | 3 589 1 |
| 89 3 45 | 1 49 6 | 2 7 58 |
| 1 7 2 | 38 5 39 | 4 89 6 |
+-----------+----------+----------+
| 568 68 3 | 2 49 49 | 1 58 7 |
| 58 4 9 | 7 3 1 | 6 2 58 |
| 2 1 7 | 5 6 8 | 9 4 3 |
+-----------+----------+----------+
| 4 9 8 | 6 1 5 | 7 3 2 |
| 3 5 1 | 9 7 2 | 8 6 4 |
| 7 2 6 | 34 8 34 | 5 1 9 |
+-----------+----------+----------+

Play this puzzle online at the Daily Sudoku site

W-Wing (89), b13, SL 9 in r1=>r2c9<>8

JC Van Hay

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

Posted: Mon Apr 22, 2013 4:52 pm Post subject:

After Singles + Locked Candidates + Subsets :

Code:

+---------------------+---------------+-----------------+
| 58(69) 568 458 | 478 2 479 | 3 (589) 1 |
| 58-3(9) (358) 458 | 1 49 6 | 2 7 (58) |
| 1 7 2 | 38 5 39 | 4 89 6 |
+---------------------+---------------+-----------------+
| 58(6) (568) 3 | 2 49 49 | 1 (58) 7 |
| 58 4 9 | 357 37 1 | 6 2 358 |
| 2 1 7 | 35 6 8 | 9 4 35 |
+---------------------+---------------+-----------------+
| 4 9 58 | 6 1 57 | 78 3 2 |
| 358 2358 1 | 9 37 2357 | 78 6 4 |
| 7 23 6 | 34 8 234 | 5 1 9 |
+---------------------+---------------+-----------------+

#1. Chain[7] : 9r2c1=9r1c1-[9r1c8 and 6r1c1=6r4c1-6r4c2]=RP(58)r4c28.r1c8.r2c9-(58=3)r2c2 :=> -3r2c1; 15 Singles; LC(5) :=> -5r12c1
or
Invalid Pattern (58)r1c8.r2c29.r4c28
||
3r2c2
||
6r4c2-6r4c1=(6-9)r1c1=9r2c1
||
9r1c8-9r1c1=9r2c1

#2. Chain[3] : XYWing(4-89)r1c4.r2c15 :=> -8r1c12

Marty R.

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

Posted: Mon Apr 22, 2013 7:02 pm Post subject:

I guess I have to withdraw my solution. Looking at JC's grid, it is apparent I erred in basics by solving r7c3 for 8.

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