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Puzzle NR 09/12/01

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Tue Dec 01, 2009 5:47 pm Post subject: Puzzle NR 09/12/01

Code:

+-----------------------+
| . 3 7 | . . . | 4 . 6 |
| 1 6 . | . . . | . 7 . |
| 5 . 9 | . . . | . . . |
|-------+-------+-------|
| . . . | 6 . . | . 9 . |
| . . . | . 4 . | . . 3 |
| . . . | . . 5 | 6 . . |
|-------+-------+-------|
| 9 . . | . . 1 | . 5 . |
| . 7 . | 4 . . | 2 . 9 |
| 2 . . | . 9 . | . 4 1 |
+-----------------------+

Play this puzzle online at the Daily Sudoku site

tlanglet

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

Posted: Wed Dec 02, 2009 5:17 am Post subject:

After basics:

Code:

*-----------------------------------------------------------------------------*
| 8 3 7 | 5 12 9 | 4 12 6 |
| 1 6 24 | 238 238 234 | 9 7 5 |
| 5 24 9 | 127 1267 2467 | 18 3 -28 |
|-------------------------+-------------------------+-------------------------|
|@47 1258 2358 | 6 12378 237 | 157 9 @247 |
| 6 12589 258 | 12789 4 27 | 157 128 3 |
|@47 1289 238 | 123789 12378 5 | 6 128 @247 |
|-------------------------+-------------------------+-------------------------|
| 9 48 468 | 237 2367 1 | 378 5 78 |
| 3 7 1 | 4 5 8 | 2 6 9 |
| 2 58 568 | 37 9 367 | 378 4 1 |
*-----------------------------------------------------------------------------*

A type 2 UR 47 is in r46c19. To prevent the DP, a 2 must be in r4c9 or r6c9; thus r3c9<>2.

This results in the following code:

Code:

*-----------------------------------------------------------*
| 8 3 7 | 5 1 9 | 4 2 6 |
| 1 6 24 | 8 23 234 | 9 7 5 |
| 5 d24 9 |e27 267 2467 | 1 3 8 |
|-------------------+-------------------+-------------------|
| 47 1 2358 | 6 2378 237 | 57 9 24 |
| 6 2589 258 | 19 4 27 | 57 18 3 |
| 47 289 238 | 19 2378 5 | 6 18 24 |
|-------------------+-------------------+-------------------|
| 9 c48 468 | 23 26 1 |b38 5 7 |
| 3 7 1 | 4 5 8 | 2 6 9 |
| 2 58 568 |f37 9 67 |a38 4 1 |
*-----------------------------------------------------------*

At this point I was looking for xy-wing and found a conflicting chain marked "abcdef".

(3)r9c7 - (3=8)r7c7 - (8=4)r7c2 - (4=2)r3c2 - (2=7)r3c4 - (7=3)r9c4; r9c7<>3 to complete the puzzle.

Ted

Marty R.

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

Posted: Wed Dec 02, 2009 5:34 am Post subject:

I used the 248 XY-Wing, X-Wing on 1, XYZ on 267 and W-Wing on 27.

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