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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Sep 28, 2010 5:15 pm Post subject: Puzzle 10/09/28: C |
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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 |
+-----------------------+
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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
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| Posted: Tue Sep 28, 2010 6:01 pm Post subject: |
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Maybe I just struck lucky...!? 
| 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: 494
Location: Charleroi, Belgium
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| Posted: Tue Sep 28, 2010 6:26 pm Post subject: |
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Idem but written differently ...  | Quote: | | ALS XZ-rule : (67=9)R2C4,R1C6 (9=346)R137C5 : r89c4<>6 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Sep 28, 2010 6:46 pm Post subject: |
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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: 5770
Location: Rochester, NY, USA
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| Posted: Thu Sep 30, 2010 12:33 am Post subject: |
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| 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: 3854
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| Posted: Thu Sep 30, 2010 1:22 am Post subject: |
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| 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
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| Posted: Thu Sep 30, 2010 9:29 am Post subject: Unreasonable? |
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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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