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Puzzle 11/04/24: ~ Difficult BBDB

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Apr 24, 2011 5:34 pm    Post subject: Puzzle 11/04/24: ~ Difficult BBDB Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Mon Apr 25, 2011 8:48 am    Post subject: Reply with quote

Five steps - I actually played #3/4 as an almost- but it adds nothing to the solution...
Quote:
type 1 ur(78) ; r8c6<>78=2
skyscraper(5) r2, r8 ; r1c9<>5, r7c8<>5
xy-chain (9=5)r7c2 - (5=9)r1c2 - (9=3)r2c1 - (3=7)r3c1 - (7=1)r3c9 - (1=9)r6c9 ; r7c9<>9
xy-wing(59-7) r7c2 ; r7c3<>7, r8c79<>7
xy-wing(79-4) r7c8 ; r5c7<>4
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon Apr 25, 2011 10:35 am    Post subject: Reply with quote

Interesting, I never expected that you'd use all of the steps my solver used.

I did find it to be an interesting mix of steps.
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Mon Apr 25, 2011 10:39 am    Post subject: Reply with quote

daj95376 wrote:
I did find it to be an interesting mix of steps.

I did dodge an x-wing along the way and I think at the end there was a choice of w-wing or xy-wing. I could see no obvious (or even less than obvious!) way to do it quicker - though I am sure there is! Nice solid puzzle, Danny, thanks.
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Marty R.



Joined: 12 Feb 2006
Posts: 5166
Location: Rochester, NY, USA

PostPosted: Tue Apr 26, 2011 4:19 am    Post subject: Reply with quote

Type 1 UR (78)
AIC; r3c7, r7c8<>8
XY-Wing (597), flightless with transport; r1c9<>7
Multi-coloring; r1c7<>4
Remote Pairs (45); r8c3<>5 -or- BUG+1
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