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Puzzle 11/06/12: ~ XY (BBDB?)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Jun 12, 2011 4:17 pm    Post subject: Puzzle 11/06/12: ~ XY (BBDB?) Reply with quote
Code:
 +-----------------------+
 | . . 8 | . . . | . . . |
 | . . 2 | 8 . . | . 1 4 |
 | 4 3 6 | 2 7 1 | . . . |
 |-------+-------+-------|
 | . 7 9 | 3 . 4 | . 6 . |
 | . . 1 | . 9 . | . . . |
 | . . 3 | 1 . 8 | . . 9 |
 |-------+-------+-------|
 | . . . | . . . | . 9 . |
 | . 6 . | 4 . . | 1 3 . |
 | . 9 . | . . 3 | . . 7 |
 +-----------------------+

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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Mon Jun 13, 2011 6:17 am    Post subject: Reply with quote
Two moves - first one found as an x-cycle/fish(?) with straightforward extension - some might prefer it as two moves...
Quote:
(2)r7c6=r5c6 - r5c9=r456c7 - r9c7=r9c5 {loop} - (8)r9c5=r8c5 - (8=2)r8c1 ; r5c127<>2, r7c7<>2, r8c5<>2, r7c2<>2
BUG+1 ; r5c7=5
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Jun 13, 2011 12:59 pm    Post subject: Reply with quote
Again, my moves were similar to those posted by Peter, but I missed a useful detail and required four steps.............

Quote:
almost x-wing(2)r49c57 with fin (2)r4c1; r7c7, r5c7,r6c5,r8c5<>2
If fin is true: (2)r4c1-r8c1=r7c2*-r7c6=(2)r5c6**-r5c79=r46c7-r9c7=(2)r9c5

xy-wing (-258) vertex (58)r8c5; r4c1<>2
Plus transport (2)r4c5-r9c5=(2)r7c6; r7c2<>2

x-wing (2)r49c57; r6c7<>2 (Yes, the same x-wing as the first step!)

BUG+1

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Jun 13, 2011 3:24 pm    Post subject: Reply with quote
peterj wrote:
first one found as an x-cycle/fish(?)

Peter: Although there are Swordfish variants for your X-Cycle eliminations, I like your X-Cycle best.

Also, congratulations on catching the ERI elimination in r5c7. Here's how it's handled in the notation:

(2)r7c6=r5c6 - r5c79=r456c7 - r9c7=r9c5 {loop}

Note: I used red because it stands out, not because of an error.

Regards, Danny
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Jun 14, 2011 4:38 pm    Post subject: Reply with quote
I solved this only by hacking away at it, using Fin Transports, XYZ-Transport, ERs, XY-Wing and X-Wing,
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