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Set J Puzzle 21 -- difficult VH+

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Tue Feb 03, 2009 6:38 pm Post subject: Set J Puzzle 21 -- difficult VH+

Code:

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

Play this puzzle online at the Daily Sudoku site

wapati

Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.

Posted: Wed Feb 04, 2009 3:18 pm Post subject:

Best I have done on this one is an ER, x-wing, xyz-wing, a UR and a final xy-wing. Fun puzzle!

tlanglet

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

Posted: Wed Feb 04, 2009 4:18 pm Post subject:

Must be my lucky day. My first pass was a four-stepper.

Quote:

x-wing <7>,
kite <8>,
Type 1 UR <34>,
xy-wing <358>

Ted

Marty R.

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

Posted: Mon Feb 09, 2009 10:57 pm Post subject:

This one was a challenge. I needed a half-dozen steps followed by Medusa.

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon Feb 09, 2009 11:53 pm Post subject:

tlanglet wrote:

Must be my lucky day. My first pass was a four-stepper.

Hmmm! I think you were too lucky because I have two more steps needed. Smile

tlanglet

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

Posted: Tue Feb 10, 2009 1:27 am Post subject:

daj95376 wrote:

tlanglet wrote:

Must be my lucky day. My first pass was a four-stepper.

Hmmm! I think you were too lucky because I have two more steps needed. Smile

Danny,

Here is my code after the x-wing <7>, the Kite <8>, and the Type 1 UR 34 that I originally reported.

Code:

*--------------------------------------------------------------------*
| 6 7 8 | 2 34 34 | 19 15 59 |
| 1 4 2 | 6 9 5 | 37 37 8 |
| 5 9 3 | 8 7 1 | 2 4 6 |
|----------------------+----------------------+----------------------|
| 9 38 6 | 1 258 2378 | 378 3578 4 |
| 348 1 5 | 347 6 a38 |-389 2 -379 |
| 348 2 7 |-34 *58 9 | 16 16 b35 |
|----------------------+----------------------+----------------------|
| 378 38 1 | 9 34 34678 | 5 3678 2 |
| 28 5 4 | 37 1 268 | 68 9 37 |
| 2378 6 9 | 5 28 2378 | 4 378 1 |
*--------------------------------------------------------------------*

The final step I reported was a xy-wing <358> with pivot <58> at r6c5 (marked "*") and pincers <38> at r5c6 & <35> at r6c9 (marked "a" & "b"). This makes three deletions of digit <3> as noted. After some cleanup I have the following code.

Code:

*--------------------------------------------------------------------*
| 6 7 8 | 2 34 34 | 19 15 59 |
| 1 4 2 | 6 9 5 | 37 37 8 |
| 5 9 3 | 8 7 1 | 2 4 6 |
|----------------------+----------------------+----------------------|
| 9 38 6 | 1 258 2378 | 378 3578 4 |
| 4 1 5 |c37 6 a38 | 89 2 79 |
| 38 2 7 | 4 *58 9 | 16 16 b35 |
|----------------------+----------------------+----------------------|
| 378 38 1 | 9 34 34678 | 5 3678 2 |
| 28 5 4 |d37 1 268 | 68 9 -37 |
| 2378 6 9 | 5 28 2378 | 4 378 1 |
*--------------------------------------------------------------------*

Now <3> in the pincer at r5c6 (marked "a") is transported to r8c4 (marked "d") via r5c4 (marked "c"). Pincers "b" & "d"delete <3> at r8c9 to finish the puzzle.

You are right that I forgot to originally report that I also needed a transport with the xy-wing.

Also, without the transportation, I required an additional Type 1 UR and a xy-wing to complete the puzzle for a total of six steps.

Ted

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Tue Feb 10, 2009 8:19 am Post subject:

Danny,
this puzzle had me.
til...

Code:

.---------------------.---------------------.---------------------.
| 6 7 8 | 2 34 34 | 19 15 59 |
| 1 4 2 | 6 9 5 | 37 37 8 |
| 5 9 3 | 8 7 1 | 2 4 6 |
:---------------------+---------------------+---------------------:
| 9 *38 6 | 1 2358 2378 | 378 3578 4 |
| 348 1 5 | 347 6 378 | 3789 2 379 |
|*348 2 7 | 34 *358 9 | 16 16 35 |
:---------------------+---------------------+---------------------:
| 378 *38 1 | 9 34-8 34678 | 5 3678 2 |
| 28 5 4 | 37 1 268 | 68 9 37 |
| 2378 6 9 | 5 238 2378 | 4 378 1 |
'---------------------'---------------------'---------------------'

1...8's marked above.

Code:

.---------------------.---------------------.---------------------.
| 6 7 8 | 2 34 34 | 19 15 59 |
| 1 4 2 | 6 9 5 | 37 37 8 |
| 5 9 3 | 8 7 1 | 2 4 6 |
:---------------------+---------------------+---------------------:
| 9 38 6 | 1 258 2378 | 378 3578 4 |
| 348 1 5 | 347 6 378 | 3789 2 379 |
|*348 2 7 | 34 *58 9 | 16 16 35 |
:---------------------+---------------------+---------------------:
| 378 38 1 | 9 34 34678 | 5 3678 2 |
|2-8 5 4 | 37 1 268 | 68 9 37 |
|*2378 6 9 | 5 *28 2378 | 4 378 1 |
'---------------------'---------------------'---------------------'

2...(8)r6c1 = (8)r6c5 - (8=2)r9c5 - (2)r9c1 = (2)r8c1; r8c1 <> 8

Code:

.---------------------.---------------------.---------------------.
| 6 7 8 | 2 34 34 | 19 15 59 |
| 1 4 2 | 6 9 5 | 37 37 8 |
| 5 9 3 | 8 7 1 | 2 4 6 |
:---------------------+---------------------+---------------------:
| 9 38 6 | 1 *258 2378 | 378 *3578 4 |
| 348 1 5 | 347 6 378 | 3789 2 379 |
| 348 2 7 | 34 *58 9 | 16 16 35 |
:---------------------+---------------------+---------------------:
| 378 38 1 | 9 34 34678 | 5 *3678 2 |
| 2 5 4 | 37 1 *68 |*68 9 37 |
| 378 6 9 | 5 2-8 2378 | 4 *378 1 |
'---------------------'---------------------'---------------------'

extended generalized M-wing
m-wing in red.
3...(8=5)r6c5 - (5)r4c5 = (5-8)r4c8 = (8)r79c8 - (8)r8c7 = (8)r8c6; r9c5 <> 8

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Tue Feb 10, 2009 2:51 pm Post subject:

I'm glad to see that everyone had fun working this puzzle.

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