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Puzzle 10/10/07: D XY (Bonus)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu Oct 07, 2010 7:21 pm    Post subject: Puzzle 10/10/07: D XY (Bonus) Reply with quote
Code:
 +-----------------------+
 | 3 . . | . 2 . | . 6 4 |
 | . 8 6 | 5 7 . | . 9 3 |
 | . 4 . | . . . | . . 5 |
 |-------+-------+-------|
 | . 7 . | . . . | . . . |
 | 6 3 . | . 5 7 | 4 . 9 |
 | . . . | . 9 6 | 3 5 7 |
 |-------+-------+-------|
 | . . . | . 4 1 | 9 . . |
 | 4 1 . | . . 2 | . . . |
 | 7 9 2 | . 8 5 | . . . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site



My single-stepper solution based on SIN output from my solver.

Code:
 after basics
 +--------------------------------------------------------------+
 |  3     5    *179   | *18    2     89    | @178   6     4     |
 |  12    8     6     |  5     7     4     |  12    9     3     |
 |  129   4     179   |  6     13    389   |  1278  128   5     |
 |--------------------+--------------------+--------------------|
 |  59    7     59    |  4     13    38    |  1268  128   16    |
 |  6     3     8-1   |  2     5     7     |  4     18    9     |
 | #18    2     4     | *18    9     6     |  3     5     7     |
 |--------------------+--------------------+--------------------|
 |  58    6     58    |  7     4     1     |  9     3     2     |
 |  4     1     3     |  9     6     2     |  5     7     8     |
 |  7     9     2     |  3     8     5     |  16    4     16    |
 +--------------------------------------------------------------+
 # 38 eliminations remain

 Kraken Sashimi X-Wing r16\c34 w/r1c7=1  =>  r5c3<>1

 (1)r1c7 - (12=8)b3q48 - (8=1)r5c8 - (1)r5c3

I believe this is the first time that I've used an ALS in a Kraken fish! However, looking back, I believe that I've missed the opportunity numerous times previously.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Oct 08, 2010 3:16 pm    Post subject: Reply with quote
Danny,

Very nice move!

Is it also correct to say that instead of the ALS plus the following step, you could have used a xy-wing: (1)r1c8 - (1=1)xy-wing:r2c7|r3c8|r5c8. This notation looks bad but I am trying to understand the concept of using other standard patterns to transport thru the code.

Also, I do not understand the notation you used for the ALS : (12=8)b3q48. I see that the ALS is in box3, but the "q48" part is a mystery to me.

Ted
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Oct 08, 2010 3:20 pm    Post subject: Reply with quote
Here is my fun three stepper..............

BUG-Lite+5 (789)r13c367 External SIS: r1c4=8,r3c8=8,r3c1=9; r1c6=9
(8)r1c4-(8=9)r1c6
||
(8)r3c8-r5c8=r5c3-(8=9)als:r236c1-r1c3=(9)r1c6
||
(9)r3c1-r1c3=(9)r1c6
(Still another fun but useless step......)

RP (18)r1c4 => r5c3; r1c3<>1
RP (18)r5c8 => r1c7; r3c8,r4c7<>18

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Oct 08, 2010 8:20 pm    Post subject: Reply with quote
tlanglet wrote:
I see that the ALS is in box3, but the "q48" part is a mystery to me.

The cells in a box are labeled sequentially by row:

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

There's a previous post of mine commenting on this notation. Ronk said that he'd seen it with an "x" instead of a "q".

Regards, Danny
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri Oct 08, 2010 9:46 pm    Post subject: Reply with quote
DP 79-89-78, boxes 123, all DP killers force r3c5=3.
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Fri Oct 08, 2010 10:39 pm    Post subject: Reply with quote
Marty, could you expand on this!? How does (3)r3c6 force (3)r3c5?
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri Oct 08, 2010 11:39 pm    Post subject: Reply with quote
peterj wrote:
Marty, could you expand on this!? How does (3)r3c6 force (3)r3c5?

Another one of my patented screwups. Nothing I post can be trusted. Embarassed Laughing
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Oct 09, 2010 12:30 am    Post subject: Reply with quote
OK, let me post my next mistake. :wink:

Type 1 UR (16)
Potential Type 6 UR (28); r4c8<>1 (invalid) and r1c3<>1
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