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Puzzle 10/01/20 (C)

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Wed Jan 20, 2010 10:29 pm Post subject: Puzzle 10/01/20 (C)

Code:

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

Play this puzzle online at the Daily Sudoku site

Marty R.

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

Posted: Fri Jan 22, 2010 4:26 pm Post subject:

Type 4 UR (39) X-Wing (9) Two short XY-Chains

gindaani

Joined: 06 Mar 2009
Posts: 79

Posted: Fri Jan 22, 2010 11:21 pm Post subject:

I don't see the 39 UR. After the basics, I had:

Code:

+--------+-------------+-------------+
| 5 8 9 | 4 36 1 | 7 36 2 |
| 3 7 4 | 69 2 5 | 69 8 1 |
| 6 2 1 | 39 8 7 | 5 4 39 |
+--------+-------------+-------------+
| 4 56 2 | 8 1359 39 | 136 1356 7 |
| 1 56 7 | 35 4 2 | 369 3569 8 |
| 8 9 3 | 157 157 6 | 2 15 4 |
+--------+-------------+-------------+
| 2 13 5 | 67 67 4 | 8 139 39 |
| 7 13 8 | 135 1359 39 | 4 2 6 |
| 9 4 6 | 2 13 8 | 13 7 5 |
+--------+-------------+-------------+

Play this puzzle online at the Daily Sudoku site

I used:

Quote:

skyscraper 3 r7c8<>3
53-39-93-31-13-39-91-15 r6c45<>5 r5c8<>5
65-53-39-93-31-13-39-93-36 r5c8<>6
36-9 xyz wing r5c7<>9

Marty R.

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

Posted: Sat Jan 23, 2010 1:13 am Post subject:

Quote:

I don't see the 39 UR.

In column 5, the 9s are a strong link. This is the definition of a Type 4 UR (strong link on one of the numbers) and the other number, in this case, 3, is removed from both cells.

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sat Jan 23, 2010 3:29 am Post subject:

After basics:

Code:

<39> UR Type 4 in r48c56
Type 4 because of X-Wing on <9> in these cells
=> r48c5<>3
*-----------------------------------------------------------*
| 5 8 9 | 4 36 1 | 7 36 2 |
| 3 7 4 | 69 2 5 | 69 8 1 |
| 6 2 1 | 39 8 7 | 5 4 39 |
|-------------------+-------------------+-------------------|
| 4 56 2 | 8 *1359 *39 | 136 1356 7 |
| 1 56 7 | 35 4 2 | 369 3569 8 |
| 8 9 3 | 157 157 6 | 2 15 4 |
|-------------------+-------------------+-------------------|
| 2 13 5 | 67 67 4 | 8 139 39 |
| 7 13 8 | 135 *1359 *39 | 4 2 6 |
| 9 4 6 | 2 13 8 | 13 7 5 |
*-----------------------------------------------------------*

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sat Jan 23, 2010 12:28 pm Post subject:

It's been over two days since I posted this puzzle. I think it's time that I post a solution and make an announcement.

Code:

r19\c58 Sashimi X-Wing/Skyscraper <> 3 r7c8 extraneous

r9c6 2-String Kite <> 3 r4c7

<16+5> XY-Wing r4c7/r4c2+r6c8 <> 5 r4c8 extraneous

r48c56 <39> UR Type 4 <> 3 r48c5 extraneous

<13+6> XYZ-Wing r4c8/r1c8+r4c7 <> 6 r5c8 extraneous

(3=9)r3c9 - r2c7 = (9-3)r5c7 = (3)r9c7 [gM-Wing ] <> 3 r7c9
+-----------------------------------------------------+
| 5 8 9 | 4 36 1 | 7 36 2 |
| 3 7 4 | 69 2 5 | b69 8 1 |
| 6 2 1 | 39 8 7 | 5 4 a39 |
|-----------------+-----------------+-----------------|
| 4 56 2 | 8 159 39 | 16 136 7 |
| 1 56 7 | 35 4 2 | c369 359 8 |
| 8 9 3 | 157 157 6 | 2 15 4 |
|-----------------+-----------------+-----------------|
| 2 13 5 | 67 67 4 | 8 19 39 |
| 7 13 8 | 135 159 39 | 4 2 6 |
| 9 4 6 | 2 13 8 | d13 7 5 |
+-----------------------------------------------------+
# 37 eliminations remain

I have a number of puzzles where a gM-Wing is used to get around an XY-Chain. I now believe these puzzles are unreasonable to post. So, I'm going to delete them. However, puzzles where a W-Wing is used to get around an XY-Chain will still be fair game for posting.

Regards, Danny

arkietech

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

Posted: Sat Jan 23, 2010 2:58 pm Post subject:

daj95376 wrote:

I have a number of puzzles where a gM-Wing is used to get around an XY-Chain. I now believe these puzzles are unreasonable to post. So, I'm going to delete them.

There is at least two more m-wings (another 39 and a 36) or short xy-chains that remove the 3 from r1c8 and solve the puzzle. I have just gotten to where I can spot them. Sorry to see them go. Sad

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