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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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 Posted: Thu Apr 12, 2012 7:37 am Post subject: Vanhegan extreme 4/11/12 |
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| Code: | *-----------*
|4..|...|..3|
|.9.|.3.|.1.|
|..7|6.1|5..|
|---+---+---|
|..2|564|8..|
|.6.|9.3|.5.|
|..4|817|9..|
|---+---+---|
|..9|3.6|1..|
|.2.|.5.|.4.|
|6..|...|..9|
*-----------*
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Play/print online |
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SudoQ
Joined: 02 Aug 2011
Posts: 127
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| Posted: Thu Apr 12, 2012 12:37 pm Post subject: |
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A clean puzzle! Nothing but singles plus one step:
r9c4=1 -> r9c6=2 -> r2c6=8 ->
r9c2=1 -> r1c2=8 -> r2c3<>8
/SudoQ |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Apr 12, 2012 4:45 pm Post subject: |
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Note the potential DP on 89 in boxes 23. The DP is killed by either 7 or the 4 in r3c5.
R1c5=7 or r1c8=7-->r1c4=2-->r2c6=8.
R3c5=4-->r3c9=8-->r8c9 not 8-->r9c8=8. Pincers r2c6 and r9c8-->r9c6<>8.
Note the word "not" in the above line. The site would not let me use the <> to indicate not 8.
| Code: |
+--------------+--------------+---------------+
| 4 18 168 | 27 789 258 | 267 789 3 |
| 5 9 68 | 247 3 28 | 2467 1 4678 |
| 2 3 7 | 6 489 1 | 5 89 48 |
+--------------+--------------+---------------+
| 9 17 2 | 5 6 4 | 8 3 17 |
| 178 6 18 | 9 2 3 | 47 5 147 |
| 3 5 4 | 8 1 7 | 9 6 2 |
+--------------+--------------+---------------+
| 78 478 9 | 3 478 6 | 1 2 5 |
| 178 2 3 | 17 5 9 | 67 4 678 |
| 6 1478 5 | 1247 478 28 | 3 78 9 |
+--------------+--------------+---------------+
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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: Thu Apr 12, 2012 5:38 pm Post subject: |
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| Marty R. wrote: | . The site would not let me use the <> to indicate not 8.
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Marty, try checking the "disable HTML this post" box
I used: | Code: | *-----------------------------------------------------------*
| 4 d18 c168 |a27 789 5 |b267 789 3 |
| 5 9 68 | 247 3 28 | 2467 1 4678 |
| 2 3 7 | 6 489 1 | 5 89 48 |
|-------------------+-------------------+-------------------|
| 9 17 2 | 5 6 4 | 8 3 17 |
| 178 6 18 | 9 2 3 | 47 5 147 |
| 3 5 4 | 8 1 7 | 9 6 2 |
|-------------------+-------------------+-------------------|
| 78 478 9 | 3 478 6 | 1 2 5 |
| 178 2 3 | 17 5 9 | 67 4 678 |
| 6 x1478 5 |x147-2 478 28 | 3 78 9 |
*-----------------------------------------------------------*
Extended L-wing
L-wing[(2)r1c4=(2-6)r1c7=(6-1)r1c3=(1)r1c2]-r9c2=(1)r9c4 => r9c4<>2;
stte |
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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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| Posted: Thu Apr 12, 2012 5:47 pm Post subject: |
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After the Basics, same as Marty's Grid above, we can eliminate 7 in r8c4 using the candidates left in r1c4 as follows:-
If r1c4=7 => r8c4<>7
If r1c4=2 then, r1c7<2>r2c6=8 =>r2c3=6 =>r1c3<6>r8c7=7; r8c4<>7.
Last edited by Clement on Thu Apr 12, 2012 5:58 pm; edited 2 times in total |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Apr 12, 2012 5:47 pm Post subject: |
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| Dan, thanks, the HTML thing did it. |
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