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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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 Posted: Mon Apr 30, 2012 5:54 am Post subject: Vanhegan extreme 4/30/12 |
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| Code: |
*-----------*
|.5.|.4.|8..|
|...|2..|..9|
|2.4|..8|3..|
|---+---+---|
|..9|.6.|.2.|
|4..|8.5|..3|
|.7.|.3.|6..|
|---+---+---|
|..5|4..|9.6|
|1..|..9|...|
|..7|.5.|.3.|
*-----------*
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Play/Print online |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Apr 30, 2012 6:01 pm Post subject: |
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Grid's too busy for me. I removed an 8 and 1 from box 4 from coloring on 8 and could remove a 3 from r7c2 due to the Hidden UR, but that looks fruitless.
| Code: |
+----------------+-----------------+------------------+
| 679 5 136 | 13679 4 1367 | 8 167 2 |
| 67 1368 1368 | 2 17 1367 | 45 45 9 |
| 2 169 4 | 5 179 8 | 3 167 17 |
+----------------+-----------------+------------------+
| 358 38 9 | 17 6 147 | 1457 2 14578 |
| 4 126 126 | 8 1279 5 | 17 179 3 |
| 58 7 12 | 19 3 124 | 6 14589 1458 |
+----------------+-----------------+------------------+
| 38 238 5 | 4 1278 1237 | 9 178 6 |
| 1 23468 2368 | 367 278 9 | 2457 4578 4578 |
| 69 24689 7 | 16 5 126 | 124 3 148 |
+----------------+-----------------+------------------+
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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: Mon Apr 30, 2012 6:17 pm Post subject: |
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This one is rare (for me to spot anyway)  | Code: |
*--------------------------------------------------------------------*
|e679 5 136 |a39-167 4 1367 | 8 167 2 |
| 67 1368 1368 | 2 17 1367 | 45 45 9 |
| 2 169 4 | 5 179 8 | 3 167 17 |
|----------------------+----------------------+----------------------|
| 358 138 9 | 17 6 147 | 1457 2 14578 |
| 4 126 126 | 8 1279 5 | 17 179 3 |
| 58 7 128 | 19 3 124 | 6 14589 1458 |
|----------------------+----------------------+----------------------|
| 38 238 5 | 4 1278 1237 | 9 178 6 |
| 1 c23468 c2368 |b36-7 278 9 | 2457 4578 4578 |
|d69 2489-6 7 | 16 5 126 | 124 3 148 |
*--------------------------------------------------------------------*
loop
(3)r1c4=(3-6)r8c4=r8c23-(6=9)r9c1-r1c1=(9)r1c4
=> r1c4<>167, r8c4<>7, r9c2<>6; lcls |
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aran
Joined: 19 Apr 2010
Posts: 70
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| Posted: Tue May 01, 2012 12:53 pm Post subject: |
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Vanhegan extreme 30.4.2012 after ssts
| Code: |
*--------------------------------------------------------------------*
| 679 5 136 | 13679 4 1367 | 8 167 2 |
| 67 1368 1368 | 2 17 1367 | 45 45 9 |
| 2 169 4 | 5 179 8 | 3 167 17 |
|----------------------+----------------------+----------------------|
| 358 138 9 | 17 6 147 | 1457 2 14578 |
| 4 126 126 | 8 1279 5 | 17 179 3 |
| 58 7 128 | 19 3 124 | 6 14589 1458 |
|----------------------+----------------------+----------------------|
| 38 238 5 | 4 1278 1237 | 9 178 6 |
| 1 23468 2368 | 367 278 9 | 2457 4578 4578 |
| 69 24689 7 | 16 5 126 | 124 3 148 |
*--------------------------------------------------------------------*
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8r7c8=167r137c8-(17=9)r5c8-r5c5=r3c5-r3c2=r1c1-r9c1=(9-8)r9c2=8r9c9-8r7c8 : loop
=><246>r9c2 <8>r8c89
ste |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Tue May 01, 2012 4:53 pm Post subject: |
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aran, nice solution.
I do want to draw your attention to the following points :
1. You can go directly from r3c2 to r9c2.
2. You forgot to indicate <17>r68c8 in the list of eliminations (required to get ste).
Just for the fun, here is another single-stepper :
9r9c2=9r3c2-9r3c5=9r5c5-9r6c4=1247r46c46-(12=8)r6c3-8r2c3=8r2c2 :=> -8r9c2; ste
Best Regards, JC |
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aran
Joined: 19 Apr 2010
Posts: 70
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| Posted: Wed May 02, 2012 10:57 am Post subject: |
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JC Van Hay
Good solution
On your first point, quite right (I had had my eye on r9c1 for a time, and must have felt it deserved a mention !).
On your second point, do you really think so ?... |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Wed May 02, 2012 12:10 pm Post subject: |
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| aran wrote: | | On your second point, do you really think so ?... |
After <246>r9c2 and <8>r8c89, 4r8c2=4 ; then, either NP(57)r8c89 and r8c7=2, or <7>r8c2 (included in the eliminations from the loop) [and r8c8=5, r8c9=7, r8c7=2]; afterwards, singles only to the end (ste).
Best Regards, JC. |
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aran
Joined: 19 Apr 2010
Posts: 70
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| Posted: Wed May 02, 2012 12:34 pm Post subject: |
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| JC Van Hay wrote: |
After <246>r9c2 and <8>r8c89, 4r8c2=4 ; then, either NP(57)r8c89 and r8c7=2, or <7>r8c2 (included in the eliminations from the loop) [and r8c8=5, r8c9=7, r8c7=2]; afterwards, singles only to the end (ste).
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After <246>r9c2 and <8>r8c89, r8c489=457, so <457>=2 r8c7.
You may not regard that as a "single".
I suppose it all depends on whether "single" means :
- a single can be placed next move
- a single can be placed next move only by one single weak link x-(x=y)
All that said, I must confess that I regard any position solved by ssts as solved full stop.
Perhaps sstste...would reflect that better |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Wed May 02, 2012 2:08 pm Post subject: |
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| aran wrote: |
All that said, I must confess that I regard any position solved by ssts as solved full stop.
Perhaps sstste...would reflect that better |
Recalling your "almost naked pair" => "hidden naked pair" => "hidden pair" argument, IMO you should go with "hidden ste."  |
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aran
Joined: 19 Apr 2010
Posts: 70
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| Posted: Wed May 02, 2012 5:51 pm Post subject: |
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| ronk wrote: |
Recalling your "almost naked pair" => "hidden naked pair" => "hidden pair" argument, IMO you should go with "hidden ste." |
So you've remembered that gem...  |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Thu May 03, 2012 10:23 am Post subject: |
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| aran wrote: | | ronk wrote: | | Recalling your "almost naked pair" => "hidden naked pair" => "hidden pair" argument, IMO you should go with "hidden ste." |
So you've remembered that gem... |
More like an egg than a gem. |
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aran
Joined: 19 Apr 2010
Posts: 70
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| Posted: Thu May 03, 2012 10:45 am Post subject: |
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| ronk wrote: |
More like an egg than a gem. |
A gem the size of an egg, now that is going a bit far. |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Thu May 03, 2012 12:33 pm Post subject: |
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| aran wrote: | | ronk wrote: | | More like an egg than a gem. |
A gem the size of an egg, now that is going a bit far. |
I meant the idiom lay an egg or even rotten egg, take your pick. |
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aran
Joined: 19 Apr 2010
Posts: 70
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| Posted: Fri May 04, 2012 9:49 am Post subject: |
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| ronk wrote: |
I meant the idiom lay an egg or even rotten egg, take your pick. |
Why I thought you had the Koh-i-Nor in your mind...
Egregious comes to my mind... |
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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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