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Puzzle 11/02/01 B

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Tue Feb 01, 2011 10:21 pm Post subject: Puzzle 11/02/01 B

Code:

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

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Marty R.

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

Posted: Wed Feb 02, 2011 11:58 pm Post subject:

I'm punting on this one.

Code:

+----------+--------------+-------------+
| 5 6 3 | 17 8 17 | 9 2 4 |
| 4 7 8 | 5 9 2 | 13 6 13 |
| 12 12 9 | 3 4 6 | 8 5 7 |
+----------+--------------+-------------+
| 13 8 5 | 9 237 4 | 12 37 6 |
| 6 4 2 | 78 1 378 | 37 9 5 |
| 139 19 7 | 6 23 5 | 124 48 128 |
+----------+--------------+-------------+
| 8 5 4 | 12 37 19 | 6 37 29 |
| 29 3 6 | 2478 5 789 | 247 1 289 |
| 7 29 1 | 248 6 389 | 5 48 2389 |
+----------+--------------+-------------+

Play this puzzle online at the Daily Sudoku site

peterj

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

Posted: Thu Feb 03, 2011 8:50 am Post subject:

Marty, there is a nicely concealed w-wing(13) with r2c7 and r4c1 via a 3 strong link in b6. I think that gets most of the way.

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Thu Feb 03, 2011 12:02 pm Post subject:

Yes, the single W-Wing made it very difficult to get past the bottleneck.

Code:

c29r6 Skyscraper <> 1 r2c1,r3c7
r4c7 2-String Kite <> 7 r8c5

+--------------------------------------------------------------+
| 5 6 3 | 17 8 17 | 9 2 4 |
| 4 7 8 | 5 9 2 | a13 6 13 |
| 12 12 9 | 3 4 6 | 8 5 7 |
|--------------------+--------------------+--------------------|
| d13 8 5 | 9 237 4 | 2-1 c37 6 |
| 6 4 2 | 78 1 378 | b37 9 5 |
| 139 19 7 | 6 23 5 | 124 48 128 |
|--------------------+--------------------+--------------------|
| 8 5 4 | 12 37 19 | 6 37 29 |
| 29 3 6 | 2478 5 789 | 247 1 289 |
| 7 29 1 | 248 6 389 | 5 48 2389 |
+--------------------------------------------------------------+
# 48 eliminations remain

W-Wing (1=3)r2c7 - r5c7 = r4c8 - (3=1)r4c1 => r4c7<>1
-or-
S-Wing (1)r4c1 = r4c7 - (1=3)r2c7 - r5c7 = (3)r4c8 => r4c1<>3

<78+4> XY-Wing r8c6/r8c7+r9c4 <> 4 r8c4,r9c8 equivalent
<47+8> XY-Wing r8c7/r8c6+r9c8 <> 8 r8c9,r9c4

Although there are 22 bivalue cells, only <13>, <29> and <37> as equivalent bivalue cells that had any possibility of eliminations. Still, difficult!

Marty R.

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

Posted: Thu Feb 03, 2011 4:40 pm Post subject:

peterj wrote:

Marty, there is a nicely concealed w-wing(13) with r2c7 and r4c1 via a 3 strong link in b6. I think that gets most of the way.

Yes, that was extremely well concealed. Thanks.

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