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Oct 3 DB

 
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Earl



Joined: 30 May 2007
Posts: 625
Location: Victoria, KS

PostPosted: Sat Oct 03, 2009 2:04 pm    Post subject: Oct 3 DB Reply with quote

The October 3 DB is colorful and complex. Is there a single simple step?

A Solution: coloring in 9's, but a bit tricky


Earl

Code:

+-------+-------+-------+
| . . . | 4 . . | . 3 . |
| . . 8 | . . . | 6 7 . |
| . . . | 7 2 . | 8 . . |
+-------+-------+-------+
| . . 7 | . 8 . | 3 . 5 |
| . . . | . . . | . . . |
| 1 . 4 | . 5 . | 2 . . |
+-------+-------+-------+
| . . 5 | . 6 4 | . . . |
| . 2 1 | . . . | 9 . . |
| . 8 . | . . 5 | . . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Sat Oct 03, 2009 4:47 pm    Post subject: Reply with quote

specially if you can't color Very Happy
Code:
 *-----------------------------------------------------------*
 | 67    67    29    | 4     19    8     | 5     3     12    |
 | 29    14    8     | 5     3     19    | 6     7     124   |
 | 5     14    3     | 7     2     6     | 8     19    149   |
 |-------------------+-------------------+-------------------|
 | 269   69    7     | 19    8     129   | 3     4     5     |
 | 8     5     29    | 3     4     279   | 17    6     179   |
 | 1     3     4     | 6     5     79    | 2     89    789   |
 |-------------------+-------------------+-------------------|
 | 379   79    5     | 12    6     4     | 17    128   1378  |
 | 4     2     1     | 8     7     3     | 9     5     6     |
 | 37    8     6     | 129   19    5     | 4     12    37    |
 *-----------------------------------------------------------*
Quote:
(9)r5c3=(9)r1c3-(9=1)r1c5-(1)r2c6=(1-2)r4c6=(2)r5c6-(2)r5c3 => r5c3=9
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keith



Joined: 19 Sep 2005
Posts: 3344
Location: near Detroit, Michigan, USA

PostPosted: Sat Oct 03, 2009 9:18 pm    Post subject: Reply with quote

In Dan's grid there are three UR's, but they do not solve it. Crying or Very sad

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sun Oct 04, 2009 1:10 am    Post subject: Reply with quote

I can always turn a one-stepper into a five. I used three URs, an XY-Wing with pincer transport and finished with Remote Pairs.
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ttt



Joined: 06 Dec 2008
Posts: 42
Location: vietnam

PostPosted: Sun Oct 04, 2009 8:25 am    Post subject: Reply with quote

keith wrote:
In Dan's grid there are three UR's, but they do not solve it. Crying or Very sad

Code:
 *-----------------------------------------------------------*
 | 67    67    29    | 4     19    8     | 5     3     12    |
 | 29    14    8     | 5     3     19    | 6     7     124   |
 | 5     14    3     | 7     2     6     | 8    #19    149   |
 |-------------------+-------------------+-------------------|
 | 269   69    7     |#19    8     129   | 3     4     5     |
 | 8     5     29    | 3     4     279   | 17    6     179   |
 | 1     3     4     | 6     5     79    | 2     89    789   |
 |-------------------+-------------------+-------------------|
 | 379   79    5     |*12    6     4     | 17   *128   1378  |
 | 4     2     1     | 8     7     3     | 9     5     6     |
 | 37    8     6     |*129   19    5     | 4    *12    37    |
 *-----------------------------------------------------------*

Perhaps, this one can: AUR(12)r79c48 => at least one of [(1)r4c4, (1)r3c8] must be true
(1)r4c4=(1)r3c8-(1=2)r1c9-(2)r1c3=(2)r2c1-(2=69)r4c12 => r4c4<>9

ttt
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Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England

PostPosted: Sun Oct 04, 2009 3:22 pm    Post subject: Reply with quote

The puzzle can also be solved using the swordfish for 9 in rows 2, 4 and 7:

Code:
 *-----------------------------------------------------------*
 |  67    67    29  |    4     19    8    | 5     3     12   |
 | F29    14    8   |    5     3    F19   | 6     7     124  |
 |  5     14    3   |    7     2     6    | 8     19    149  |
 |------------------+---------------------+------------------|
 | F269  F69    7   | fin19    8    F129  | 3     4     5    |
 |  8     5     29  |    3     4     279  | 17    6     179  |
 |  1     3     4   |    6     5     79   | 2     89    789  |
 |------------------+--------------------+-------------------|
 | F379  F79    5   |    12    6     4    | 17    128   1378 |
 |  4     2     1   |    8     7     3    | 9     5     6    |
 |  37    8     6   |    129   19    5    | 4     12    37   |
 *-----------------------------------------------------------*

It eliminates 9 from r56c6.

Put more simply:

r56c6 contains 9 => three 9s must be placed in columns 1 and 2.

Steve
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