Trying to break the T&E habit

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Trying to break the T&E habit

Postby bingham » Thu Dec 20, 2007 7:14 am

Trying to break the T & E habit

This one appeared in the Palo Alto Daily news on 8/15/07.

-2-/---/--4
-5-/3--/---
--4/7-9/--1

--3/-1-/---
-4-/-7-/-6-
---/-3-/5--

9--/4-8/2--
---/--3/-9-
1--/---/-4-

I solved it then using just one T & E fork, but would now like to do it with a single logic path.
This is as far as I got

67 2 19 / 56 8 156 / 79 3 4
678 5 19 / 3 4 16 / 79 28 268
3 68 4 / 7 2 9 / 68 5 1

256 9 3 / 568 1 256 / 4 7 28
258 4 58 / 9 7 25 / 1 6 3
26 1 7 / 68 3 4 / 5 28 9

9 3 56 / 4 56 8 / 2 1 7
4 7 2 / 1 56 3 / 68 9 568
1 68 568 / 2 9 7 / 3 4 568

Can anybody see what the next few steps are?
Thanks in advance
Bingham
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Postby daj95376 » Thu Dec 20, 2007 7:35 am

Start to finish -- sans Singles.

Code: Select all
 +-----------------------+
 | . 2 . | . . . | . . 4 |
 | . 5 . | 3 . . | . . . |
 | . . 4 | 7 . 9 | . . 1 |
 |-------+-------+-------|
 | . . 3 | . 1 . | . . . |
 | . 4 . | . 7 . | . 6 . |
 | . . . | . 3 . | 5 . . |
 |-------+-------+-------|
 | 9 . . | 4 . 8 | 2 . . |
 | . . . | . . 3 | . 9 . |
 | 1 . . | . . . | . 4 . |
 +-----------------------+

Code: Select all
r3      -  68    Naked  Pair
  c7    -  68    Naked  Pair
    b3  -  79    Naked  Pair
    b1  -  678   Naked  Triple
+-----------------------------------------------------------+
|  67    2     19   |  56    8     156  |  79    3     4    |
|  678   5     19   |  3     4     16   |  79    28    268  |
|  3     68    4    |  7     2     9    |  68    5     1    |
|-------------------+-------------------+-------------------|
|  256   9     3    |  568   1     256  |  4     7     28   |
|  258   4     58   |  9     7     25   |  1     6     3    |
|  26    1     7    |  68    3     4    |  5     28    9    |
|-------------------+-------------------+-------------------|
|  9     3     56   |  4     56    8    |  2     1     7    |
|  4     7     2    |  1     56    3    |  68    9     568  |
|  1     68    568  |  2     9     7    |  3     4     568  |
+-----------------------------------------------------------+

Code: Select all
    b7  -  8     Locked Candidate (1)
+-----------------------------------+
|  .  .  .  |  .  8  .  |  .  .  .  |
|  8  .  .  |  .  .  .  |  .  8  8  |
|  .  8  .  |  .  .  .  |  8  .  .  |
|-----------+-----------+-----------|
|  .  .  .  |  8  .  .  |  .  .  8  |
|  8  .  8  |  .  .  .  |  .  .  .  |
|  .  .  .  |  8  .  .  |  .  8  .  |
|-----------+-----------+-----------|
|  .  .  .  |  .  .  8  |  .  .  .  |
|  .  .  .  |  .  .  .  |  8  .  8  |
|  . *8 *8  |  .  .  .  |  .  . -8  |
+-----------------------------------+

Code: Select all
    b4  -  6     Locked Candidate (1)
+-----------------------------------+
| -6  .  .  |  6  .  6  |  .  .  .  |
| -6  .  .  |  .  .  6  |  .  .  6  |
|  .  6  .  |  .  .  .  |  6  .  .  |
|-----------+-----------+-----------|
| *6  .  .  |  6  .  6  |  .  .  .  |
|  .  .  .  |  .  .  .  |  .  6  .  |
| *6  .  .  |  6  .  .  |  .  .  .  |
|-----------+-----------+-----------|
|  .  .  6  |  .  6  .  |  .  .  .  |
|  .  .  .  |  .  6  .  |  6  .  6  |
|  .  6  6  |  .  .  .  |  .  .  6  |
+-----------------------------------+

Code: Select all
721586934859341726364729851693815472548972163217634589935468217472153698186297345

I'll leave the Remote Pair in <68> for someone else.
daj95376
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Postby tarek » Thu Dec 20, 2007 10:53 am

bingham,

from the position you posted:
Code: Select all
*-----------------------------------------------*
| 67   2    19  | 56   8    156 | 79   3    4   |
| 678  5    19  | 3    4    16  | 79   28   268 |
| 3    68   4   | 7    2    9   | 68   5    1   |
|---------------+---------------+---------------|
|*256  9    3   | 568  1    256 | 4    7    28  |
|*258  4   -58  | 9    7    25  | 1    6    3   |
| 26   1    7   | 68   3    4   | 5    28   9   |
|---------------+---------------+---------------|
| 9    3    56  | 4    56   8   | 2    1    7   |
| 4    7    2   | 1    56   3   | 68   9    568 |
| 1    68   568 | 2    9    7   | 3    4    568 |
*-----------------------------------------------*
Eliminating 5 From r5c3 (Column 1 & Box 4 Box-line interaction)


You've obviously skipped this & did eliminations elsewhere, The whole puzzle could have been solved using column 1 & box 3 after singles

Very interesting daj95376, that is quite a challenge to try and solve it without singles, I personally find naked singles very annoying.

tarek
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re: Palo Alto Daily News ( 2007.Aug.15 )

Postby Pat » Thu Dec 20, 2007 11:27 am

bingham wrote:This one appeared in the Palo Alto Daily News ( 2007.Aug.15 )

Code: Select all
 . 2 . | . . . | . . 4
 . 5 . | 3 . . | . . .
 . . 4 | 7 . 9 | . . 1
-------+-------+------
 . . 3 | . 1 . | . . .
 . 4 . | . 7 . | . 6 .
 . . . | . 3 . | 5 . .
-------+-------+------
 9 . . | 4 . 8 | 2 . .
 . . . | . . 3 | . 9 .
 1 . . | . . . | . 4 .



hi bingham,

after "hidden singles" we are at

Code: Select all
 . 2 . | . . . | . . 4
 . 5 . | 3 4 . | . . .
 . . 4 | 7 . 9 | . . 1
-------+-------+------
 . 9 3 | . 1 . | 4 . .
 . 4 . | 9 7 . | 1 6 3
 . 1 . | . 3 4 | 5 . 9
-------+-------+------
 9 3 . | 4 . 8 | 2 1 7
 4 7 . | 1 . 3 | . 9 .
 1 . . | . 9 7 | 3 4 .



in b7, the 2 is in c3 -- exclude this digit elsewhere in that column

ditto for the 5

-- these leave a "naked single" in r5c3

finish with "singles"

~ Pat
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Postby daj95376 » Thu Dec 20, 2007 4:31 pm

tarek wrote:Very interesting daj95376, that is quite a challenge to try and solve it without singles, I personally find naked singles very annoying.

I was misunderstood. Sans Singles meant that I didn't include them in my solution listing. Obviously, I needed to use them!
daj95376
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Postby tarek » Fri Dec 21, 2007 2:03 am

daj95376 wrote:
tarek wrote:Very interesting daj95376, that is quite a challenge to try and solve it without singles, I personally find naked singles very annoying.

I was misunderstood. Sans Singles meant that I didn't include them in my solution listing. Obviously, I needed to use them!

Oh, I just liked the idea to a degree that blinded my vision:D:idea:

tarek
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Postby bingham » Sat Jan 05, 2008 1:56 am

A belated thank you to all of you. I had missed the locked candidates.
I am not yet cured of my T&E addiction, but I use it less often!
bingham
 
Posts: 12
Joined: 17 December 2007


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