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Puzzle 10/10/21: A Advanced

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu Oct 21, 2010 2:39 am    Post subject: Puzzle 10/10/21: A Advanced Reply with quote
Code:
 +-----------------------+
 | . 9 4 | . . . | . . 8 |
 | . 8 . | 4 . . | . 5 . |
 | 7 . 1 | . . 8 | . 9 . |
 |-------+-------+-------|
 | . . . | . . . | . 4 . |
 | . . . | . 8 2 | . . . |
 | . . 2 | 3 . 9 | . 7 . |
 |-------+-------+-------|
 | . . . | . . . | 7 8 . |
 | . 1 7 | 6 . 4 | 9 2 . |
 | 4 . . | . . . | . . 6 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

Last edited by daj95376 on Thu Oct 21, 2010 4:59 pm; edited 1 time in total
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Thu Oct 21, 2010 4:37 pm    Post subject: Reply with quote
I played four steps for this one - and basics were quite tough too, lots of claiming/pointing
Quote:
x-chain(5) ; (5)r7c3=r5c3 - r5c7=r6c9 - r8c9=r8c5 ; r7c56<>5
xy-wing(35-6) r5c3 ; r3c2<>6
xy-wing(35-1) r8c5 ; r7c5<>1
xyz-wing(56-3) r5c7 ; r4c7<>3
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu Oct 21, 2010 5:10 pm    Post subject: Reply with quote
peterj wrote:
... and basics were quite tough too, ...

Yes, there are a number of basic steps present.

I've been concerned that numerous basic steps would create a burden. Unfortunately, my puzzle generator is designed to list the most complex puzzle it can create from a solution grid while employing symmetry and a limited number of techniques. Since basics "count" toward the complexity of a puzzle, they are often present.

It doesn't help that I'll sometimes remove the symmetry -- using gsf's solver -- to make a puzzle of limited difficulty more difficult.

Regards, Danny
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri Oct 22, 2010 12:38 am    Post subject: Reply with quote
XY-Wing (356), r3c2<>6
XY-Wing (235), flightless with pincer transport, r8c5<>5
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