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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Wed Jan 27, 2010 2:38 am Post subject: Puzzle 10/01/26 (C) |
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Single-stepper.
| Code: | +-----------------------+
| 3 . 5 | . . . | . 6 . |
| . . 6 | . . . | . . 9 |
| 7 9 1 | . 6 . | 5 . 4 |
|-------+-------+-------|
| . . . | 8 . 2 | 9 4 . |
| . . 4 | . 9 . | . . 7 |
| . . . | 7 . 6 | . . 3 |
|-------+-------+-------|
| . . 3 | 6 . . | . . . |
| 4 . . | 3 . . | . 9 . |
| . 7 9 | . 2 5 | . . 6 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Jan 27, 2010 3:45 am Post subject: |
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I used a opps  edited with another try.
Last edited by arkietech on Wed Jan 27, 2010 8:48 am; edited 1 time in total |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Jan 28, 2010 5:20 am Post subject: |
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| Same numbers as Dan (28), but in the form of a W-Wing. |
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Wendy W
Joined: 04 Feb 2008
Posts: 144
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| Posted: Fri Jan 29, 2010 12:42 am Post subject: |
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| Dan & Marty, I used an x-wing/UR on 2 and 8, but I must be missing something because it doesn't solve the puzzle. Can you help? |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Fri Jan 29, 2010 1:14 am Post subject: |
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| Wendy W wrote: | | Dan & Marty, I used an x-wing/UR on 2 and 8, but I must be missing something because it doesn't solve the puzzle. Can you help? |
| Code: |
*--------------------------------------------------------------------*
| 3 248 5 | 9 178 1478 | 1278 6 28 |
| 28 248 6 | 15 35 13478 | 12378 12378 9 |
| 7 9 1 | 2 6 38 | 5 38 4 |
|----------------------+----------------------+----------------------|
| 6 35 7 | 8 35 2 | 9 4 1 |
| 258 2358 4 | 15 9 13 | 6 28 7 |
| 9 1 28 | 7 4 6 | 28 5 3 |
|----------------------+----------------------+----------------------|
| 1258 258 3 | 6 178 9 | 4 1278 28 |
| 4 6 28 | 3 178 178 | 1278 9 5 |
| 18 7 9 | 4 2 5 | 138 138 6 |
*--------------------------------------------------------------------*
ur 28 |
Did your grid look like this after basics? |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Jan 29, 2010 5:57 am Post subject: |
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I'd like more information on this magical UR <28> !!!!
Marty: Congratulations on what I'd call a difficult W-Wing to find. Even HoDoKu missed it. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Fri Jan 29, 2010 9:26 am Post subject: |
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| daj95376 wrote: | | I'd like more information on this magical UR <28> !!!! |
Sigh!  Fooled again by another magical double chute ur. Thanks Danny |
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Wendy W
Joined: 04 Feb 2008
Posts: 144
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| Posted: Fri Jan 29, 2010 3:46 pm Post subject: |
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| Dan, yes, that's what my grid looked like after basics. Then I eliminated the 2 from Rows 1 and 2, Column 7 using an X-wing. After that I'm stuck. It's gotta be something with all those 28 pairs. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Jan 29, 2010 4:30 pm Post subject: |
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I used two moves to complete this one. Both were interesting, unusual moves for me.
A Remote Pair 28 from r8c3 to r6c3 to r6c7 and ending at r5c8 does not provide any deletions, but an extension on 8 has benefit.
(8)r8c3 - r9c1 = r9c78 - r7c9 = (8)r1c9; r23c8<>8,
Next I found a conflicting chain while looking for an extend xy-wing.
(8)r9c8 - (8=2)r7c9 - r7c12 = r8c3 - r6c3 = r6c7 - (2=8)r5c8; r9c8<>8
Ted |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Fri Jan 29, 2010 4:41 pm Post subject: |
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| Wendy W wrote: | | After that I'm stuck. It's gotta be something with all those 28 pairs. |
There is an x-wing 2 and a w-wing 28 that remove the 8 in r9c8.
This opens a skyscraper 8 that solves the puzzle.
Hope this
1. Doesn't have a dumb mistake
2. Helps you out
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Jan 29, 2010 4:51 pm Post subject: |
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| Quote: | There is a w-wing 28 that removes the 8 in r9c8.
This opens a skyscraper 8 that solves the puzzle. |
I'm not seeing that one.
I don't know if my grid was the same as the one you posted, but the 28 W-Wing in boxes 79, connected by the 8s in r9, eliminated 2s in both boxes and was a one-stepper for me. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Fri Jan 29, 2010 4:55 pm Post subject: |
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| Marty R. wrote: | | Quote: | There is a w-wing 28 that removes the 8 in r9c8.
This opens a skyscraper 8 that solves the puzzle. |
I'm not seeing that one.
I don't know if my grid was the same as the one you posted, but the 28 W-Wing in boxes 79, connected by the 8s in r9, eliminated 2s in both boxes and was a one-stepper for me. |
Thanks Marty -- I need the help. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Jan 29, 2010 4:58 pm Post subject: |
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| Wendy W wrote: | | Dan, yes, that's what my grid looked like after basics. Then I eliminated the 2 from Rows 1 and 2, Column 7 using an X-wing. After that I'm stuck. It's gotta be something with all those 28 pairs. |
Hello Wendy,
Here's a list of my difficulty ratings. XY stands for XY-Chain, but one of the other advanced steps is always available in the solution to get around it. Also, members of this forum use "pincher extension" on techniques. Ask if you aren't familiar with the process.
===== ===== ===== ===== ===== Ratings are Accumulative in Techniques ===== ===== ===== =====
| Code: | Basics: Naked/Hidden Single, Naked Pair/Triple, Locked Candidates 1/2
Basics+: Naked Quad, Hidden Pair/Triple/Quad
VH: BUG+1, UR Type 1, X-Wing, XY-Wing
VH+: 2-String Kite, Empty Rectangle, Remote Pair, Skyscraper,
XYZ-Wing, finned/Sashimi X-Wing, UR Type 2/4
XY: gM-Wing, W-Wing, XY-Chain, BUG+2, BUG+3, other URs
Extreme: Chain, Loop, SIN (Single Inference Network)
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Posts (A) and (B) usually need a VH+ step. Sometimes, they only need several VH steps. Posts (C) and above probably need an XY step. BBDB means that you can expect to use several steps before the puzzle cracks.
| Code: | r68 X-Wing <> 2 r12c7 extraneous
(2=8)r8c3 - r8c56 = r7c5 - (8=2)r7c9 [ W-Wing ] <> 2 r7c12,r8c7
+-----------------------------------------------------------------------+
| 3 248 5 | 9 178 1478 | 178 6 28 |
| 28 248 6 | 15 35 13478 | 1378 12378 9 |
| 7 9 1 | 2 6 38 | 5 38 4 |
|-----------------------+-----------------------+-----------------------|
| 6 35 7 | 8 35 2 | 9 4 1 |
| 258 2358 4 | 15 9 13 | 6 28 7 |
| 9 1 28 | 7 4 6 | 28 5 3 |
|-----------------------+-----------------------+-----------------------|
| 1258 258 3 | 6 c178 9 | 4 1278 d28 |
| 4 6 a28 | 3 b178 b178 | 1278 9 5 |
| 18 7 9 | 4 2 5 | 138 138 6 |
+-----------------------------------------------------------------------+
# 64 eliminations remain
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Wendy W
Joined: 04 Feb 2008
Posts: 144
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| Posted: Sat Jan 30, 2010 12:47 am Post subject: |
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| Thanks very much, guys, for your clear explanations. And Danny, thanks for giving us these challenging puzzles! |
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