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Puzzle 10/09/28: C

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Tue Sep 28, 2010 5:15 pm    Post subject: Puzzle 10/09/28: C Reply with quote

Clearing out the difficult puzzles. This one seems unreasonable!

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

Play this puzzle online at the Daily Sudoku site

Announcement: Away the first few days of October. Expect no puzzles then!
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peterj



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

PostPosted: Tue Sep 28, 2010 6:01 pm    Post subject: Reply with quote

Maybe I just struck lucky...!? Smile
Quote:
xy-chain ; (6=7)r2c4 - (7=9)r1c6 - (9=3)r1c5 - (3=4)r3c5 - (4=6)r7c5 ; r89c4<>6
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JC Van Hay



Joined: 13 Jun 2010
Posts: 372
Location: Charleroi, Belgium

PostPosted: Tue Sep 28, 2010 6:26 pm    Post subject: Reply with quote

Idem but written differently ... Very Happy
Quote:
ALS XZ-rule : (67=9)R2C4,R1C6 (9=346)R137C5 : r89c4<>6
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Tue Sep 28, 2010 6:46 pm    Post subject: Reply with quote

I guess a single, 5-cell XY-Chain doesn't qualify as unreasonable.

Yet another representation:

Code:
 (6=7934)b2q4328 - (4=6)r7c5  =>  r89c4<>6
 +-----------------------------------------------------------------------+
 |  4      8      37     |  1     c39    b79     |  2      6      5      |
 |  135    2      137    | a67     8      567    |  9      13     4      |
 |  135    6      9      |  24    d34     245    |  8      13     7      |
 |-----------------------+-----------------------+-----------------------|
 |  8      479    246    |  5      469    4679   |  1      249    3      |
 |  139    5      134    |  349    2      8      |  7      49     6      |
 |  369    479    2346   |  34679  1      4679   |  5      249    8      |
 |-----------------------+-----------------------+-----------------------|
 |  2      1      5      |  8     e46     3      |  46     7      9      |
 |  7      49     46     |  9-6    5      1      |  3      8      2      |
 |  69     3      8      |  249-6  7      2469   |  46     5      1      |
 +-----------------------------------------------------------------------+
 # 65 eliminations remain
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Thu Sep 30, 2010 12:33 am    Post subject: Reply with quote

Quote:
This one seems unreasonable!

I have been having a lot more trouble with recent puzzles that you haven't labeled as unreasonable. This was a BBDB for me, with seven assorted steps, but at least I was able to do it.
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Thu Sep 30, 2010 1:22 am    Post subject: Reply with quote

Marty R. wrote:
Quote:
This one seems unreasonable!

I have been having a lot more trouble with recent puzzles that you haven't labeled as unreasonable. This was a BBDB for me, with seven assorted steps, but at least I was able to do it.

Hello Marty,

Yes, I've had serious concerns about the difficulty of my puzzles for awhile now. I'm afraid that their difficulty has already driven some away.

I plan to update my Ratings list and start including it so those solving the puzzles will (again) have some idea what my solver encountered. In fact, I'm planning to include my solver's solution.

Thanks for the feedback !!!

Regards, Danny
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oaxen



Joined: 10 Jul 2006
Posts: 96

PostPosted: Thu Sep 30, 2010 9:29 am    Post subject: Unreasonable? Reply with quote

No Danny, this one was quite OK, anyhow for us chainsolvers. A syncronized test with the 9īs in row 1 gives quickly that 6 in r2c4 is correct and from that you can roll the puzzle up in one step.
Lars
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