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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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 Posted: Wed Jul 11, 2012 6:56 am Post subject: au tough July 11, 2012 |
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| Code: |
*-----------*
|.19|...|..2|
|..3|.1.|...|
|...|9.5|...|
|---+---+---|
|4.2|.9.|...|
|8..|...|..5|
|...|.6.|9.7|
|---+---+---|
|...|7.8|...|
|...|.3.|4..|
|7..|...|13.|
*-----------*
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Play online |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Jul 11, 2012 9:22 pm Post subject: |
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| Code: | *--------------------------------------------------------------------*
| 56 1 9 | 34 78 34 | 5678 568 2 |
| 25 78 3 | 26 1 267 | 578 9 4 |
| 26 478 478 | 9 278 5 | 3678 168 13 |
|----------------------+----------------------+----------------------|
| 4 67 2 | 5 9 137 | 368 168 13 |
| 8 9 a67 | 34 a27 1347-2 | 236 1246 5 |
| 13 35 b15 | 8 6 4-2 | 9 24 7 |
|----------------------+----------------------+----------------------|
| 13 36 b16 | 7 4 8 | 25 25 9 |
| 9 258 c58 | 1 3 c26 | 4 7 c68 |
| 7 248 48 | 26 5 9 | 1 3 68 |
*--------------------------------------------------------------------*
(27=6)r5c35-(61=5)r67c3-(568=2)r8c369 => -2r56c6; stte
either r5c5 is a 2 or r8c6 is a 2 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Jul 12, 2012 12:15 am Post subject: |
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| I tried it but gave up. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Thu Jul 12, 2012 1:12 am Post subject: |
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| Marty R. wrote: | | I tried it but gave up. |
did you see the ur on 34? |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Jul 12, 2012 3:40 am Post subject: |
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I had missed the quad in box 2. After that I played the34 UR and then I eliminated one digit (unhelpful) based on the 48 DP. That left me here without a further move.
| Code: |
+------------+------------+--------------+
| 56 1 9 | 34 78 34 | 5678 568 2 |
| 25 78 3 | 26 1 267 | 578 9 4 |
| 26 478 478 | 9 278 5 | 3678 168 13 |
+------------+------------+--------------+
| 4 67 2 | 5 9 137 | 368 168 13 |
| 8 9 67 | 34 27 127 | 236 1246 5 |
| 13 35 15 | 8 6 24 | 9 24 7 |
+------------+------------+--------------+
| 13 36 16 | 7 4 8 | 25 25 9 |
| 9 258 58 | 1 3 26 | 4 7 68 |
| 7 24 48 | 26 5 9 | 1 3 68 |
+------------+------------+--------------+
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Play this puzzle online at the Daily Sudoku site |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Jul 15, 2012 3:51 pm Post subject: |
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Marty, oooooh so close. All you need is a simple 7-cell XY-Chain. _  _
(2=7)r5c5 =6r5c3 =7r4c2 =4r3c2 =2r9c2 =6r9c4 - (6=2)r8c6 => r6c6<>2
BTW: Nice catch on the 48-UR elimination. It exposed the XY-Chain. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Jul 15, 2012 5:47 pm Post subject: |
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| daj95376 wrote: | Marty, oooooh so close. All you need is a simple 7-cell XY-Chain. _ _
(2=7)r5c5 =6r5c3 =7r4c2 =4r3c2 =2r9c2 =6r9c4 - (6=2)r8c6 => r6c6<>2
BTW: Nice catch on the 48-UR elimination. It exposed the XY-Chain. |
In that case, how about after basics:
| Code: | +-------------------+-------------------+-------------------+
| 56 1 9 | 34 78 34 | 5678 568 2 |
| 25 78 3 | 26 1 267 | 578 9 4 |
| 26 478 478 | 9 278 5 | 3678 168 13 |
+-------------------+-------------------+-------------------+
| 4 67 2 | 5 9 137 | 368 168 13 |
| 8 9 b67 | 34 a27 12347 | 236 1246 5 |
| 13 35 d15 | 8 6 -24 | 9 24 7 |
+-------------------+-------------------+-------------------+
| 13 36 c16 | 7 4 8 | 25 25 9 |
| 9 258 e58 | 1 3 g26 | 4 7 f68 |
| 7 248 48 | 26 5 9 | 1 3 68 |
+-------------------+-------------------+-------------------+ |
Keith |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Jul 15, 2012 7:59 pm Post subject: |
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| keith wrote: | In that case, how about after basics:
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Yes, that works fine. It also performs r5c6<>2, something that I forgot to address in my solution as well.
Originally, I was intrigued to see what was blocking Marty's progress. While examining my solver's default solution, which places URs before chains, I noticed that my solver's solution almost exactly matched Marty's solution. So, I just indicated what he could use as a next step.
Regards, Danny |
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