dailysudoku.com :: View topic - Puzzle 10/04/09 (A)

dailysudoku.com
Discussion of Daily Sudoku puzzles

FAQ

Memberlist

Usergroups

Profile

Puzzle 10/04/09 (A)

dailysudoku.com Forum Index -> Puzzles by daj

View previous topic :: View next topic

Author

Message

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Fri Apr 09, 2010 4:25 am Post subject: Puzzle 10/04/09 (A)

Friday sans <8> in givens

Code:

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

Play this puzzle online at the Daily Sudoku site

tlanglet

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

Posted: Fri Apr 09, 2010 2:43 pm Post subject:

After basics:

Code:

*--------------------------------------------------*
| 6 7 128 | 5 3 #148 | 28 19 #149 |
| 5 3 128 |#148 7 9 | 28 6 #14 |
| 189 189 4 | 168 2 168 | 7 5 3 |
|----------------+----------------+----------------|
| 4 18 5 | 2 19 3 | 6 189 7 |
| 7 2 19 | 68 4 68 | 5 3 19 |
| 3 6 189 | 7 19 5 | 4 189 2 |
|----------------+----------------+----------------|
| 28 458 3 | 9 58 7 | 1 24 6 |
| 29 59 67 |#14 56 #14 | 3 27 8 |
| 18 148 67 | 3 68 2 | 9 47 5 |
*--------------------------------------------------*

Notice the 6-cell DP14 in r1c69, r2c49 & r8c46 marked #. To prevent the deadly pattern, the two cells in b2=8 or r1c9=9 to form a strong inference.
If r1c6=8 or r2c4=8, then r3c46=16,
If r3c46=16, then r3c12=89,
If r3c12=89, then r12c3=12,
If r12c3=12, then r5c3=9.
At this point, we have two pincers on 9 in r1c9 and r5c3 which delete the 9 in r5c9.

A Type 1 UR28 in r12c37 forces r2c3=1 and a BUG+1 forces r7c2=8 to complete the puzzle.

Ted

Marty R.

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

Posted: Fri Apr 09, 2010 3:46 pm Post subject:

I used a Type 2 UR (28-1) and a BUG+1. Nice catch Ted, I wouldn't have recognized that as a DP.

Luke451

Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

Posted: Fri Apr 09, 2010 8:08 pm Post subject:

tlanglet wrote:

After basics:

Code:

Wow, this is eerie. I wrote what follows last nite, but didn't post after finding a more basic BUG-Lite in 10-04-09-B.

So here it is anyways. I think it's the same thing, save for the UR used in the second move:

To break up the deadly pattern there must be either an 8 in the designated cells box 2, or (9)r1c9

Code:

*--------------------------------------------------*
| 6 7 128 | 5 3 *14+8 | 28 19 *14+9 |
| 5 3 128 |*14+8 7 9 | 28 6 *14 |
| 189 189 4 | 168 2 168 | 7 5 3 |
|----------------+----------------+----------------|
| 4 18 5 | 2 19 3 | 6 189 7 |
| 7 2 19 | 68 4 68 | 5 3 19 |
| 3 6 189 | 7 19 5 | 4 189 2 |
|----------------+----------------+----------------|
| 28 458 3 | 9 58 7 | 1 24 6 |
| 29 59 67 |*14 56 *14 | 3 27 8 |
| 18 148 67 | 3 68 2 | 9 47 5 |
*--------------------------------------------------*

Either way, r5c9<>9=1.

Code:

(9)r1c9=(8)r1c6,r2c4-(8=16)r3c46-(1)r3c12=(1)r12c3-(1=9)r5c3

From there, just a type 1 UR(68)r35c36.

tlanglet

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

Posted: Fri Apr 09, 2010 10:15 pm Post subject:

Yes, it is the same And yes it is eerie I also noticed you reside in California. Do you also love big red wines? Ted

Luke451

Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

Posted: Fri Apr 09, 2010 11:21 pm Post subject:

What do you think about using vertical notation on these critters?

Code:

BUG-Lite (14)r1c69, r2c49, r8c46
||
(9)r1c9
||
(8)r1c6,r2c4-(8=16)r3c46-(1)r3c12=(1)r12c3-(1=9)r5c3

=>r5c9<>9=1

Seems to tell the story pretty graphically.

Did someone say red wine Question

Pinot noir, not so much (this is heresy here in the Santa Cruz Mtns.)
A big Cali cab? Now you're talkin', call me a cab.
A steaming cauldron of cioppino at an SF North Beach sidewalk cafe with the waiter uncorking a big, spicy red zin? Priceless.

Display posts from previous:

	dailysudoku.com Forum Index -> Puzzles by daj	All times are GMT
Page 1 of 1

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum