Stuck on Diabolical from Sudoku Quest

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Stuck on Diabolical from Sudoku Quest

Postby brec » Thu Jan 19, 2006 1:00 am

Sudoko Quest is a commercial Windows program. The single-number squares in (parentheses) are part of my solution; the other single-number squares are given in the puzzle. This is my second "Diabolical" -- I gave up on the first in a similar state. I'd appreciate one or two steps that I'm not seeing. Thanks!
Code: Select all
  7   | 1489 | 1458 ## 34569 |45689 | 3568 ## 1578 |356789|  2
 259  |  89  |   3  ##  2569 | 5689 |   1  ## 578  |   4  | 6789
 12459| 1489 |   6  ## 23459 | 4589 |  (7) ## 158  | 3589 | 1389
#################################################################
  34  |  5   |  478 ##  (1)  |  2   |  (9) ##  6   |  378 | 3478
 126  | 167  |  127 ##   8   |  3   |   4  ## 257  | 2579 |  79
 234  | 348  |   9  ##   56  |  7   |  56  ## 248  |   1  | 3489
#################################################################
145679|14679 | 1457 ## 24569 |145689|12568 ##  3   | 2678 |13678
13456 |  2   | 145  ##   7   |14568 |13568 ##  9   |  68  | 1368
  8   |134679| 147  ## 234569|14569 |12356 ## 1237 | 267  |  5   
[/code]
brec
 
Posts: 2
Joined: 18 January 2006

Postby emm » Thu Jan 19, 2006 1:12 am

Where is the 4 in box 9?
emm
 
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Postby Animator » Thu Jan 19, 2006 1:17 am

Code: Select all
7       1489    1458  | 34569   45689   3568   | 1578  356789  2
259     89      3     | 2569    5689    1      | 578   4       6789
12459   1489    6     | 23459   4589    7      | 158   3589    1389
----------------------+------------------------+-------------------
34      5       478   | 1       2       9      | 6     378     3478
126     167     127   | 8       3       4      | 257   2579    79
234     348     9     | 56      7       56     | 248   1       3489
----------------------+------------------------+--------------------
145679  14679   1457  | 24569   145689  12568  | 3     2678    13678
13456   2       145   | 7       14568   13568  | 9     68      1368
8       134679  147   | 234569  14569   12356  | 1237  267     5


a) update pencilmarks: row 6 already has the number 9 ==> r6c9 remove the 9.
b) column 6 already has the number 1 ==> remove the number 1 in r7c6, r8c6, r9c6
c) And a whole lot more... I won't list them all.

'A' next move:

Where can the number 2 go in column 3 ? It can only go in once cell.

Alternative move:

Where can the number 2 go in box 1? It's only possible in column 1. ==> remove 2 as candidate from: r5c1 and r6c1.

Naked pair in column 1/box 4. There are two cells that have exactly the same two candidates. (r4c1 and r6c1) ==> remove 3 and 4 from: r3c1, r7c1, r8c1, r4c3, r6c2.

This leaves only one number for r6c2.

(I reposted the grid because your post is using too many symbols (or atleast in my opinion))
Last edited by Animator on Thu Jan 19, 2006 10:16 am, edited 2 times in total.
Animator
 
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Postby QBasicMac » Thu Jan 19, 2006 4:50 am

Animator wrote:in my opinion


Heh - mine, too.

This is the kind of puzzle I like: only hidden pairs at most.

Mac
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Postby brec » Thu Jan 19, 2006 7:30 am

Thanks! I'm not surprised to have made errors, as that has been my biggest problem thus far. I guess I just have to slow down...
brec
 
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Postby CathyW » Thu Jan 19, 2006 6:06 pm

Original grid was:

Code: Select all
 *-----------*
 |7..|...|..2|
 |..3|..1|.4.|
 |..6|...|...|
 |---+---+---|
 |.5.|.2.|6..|
 |...|834|...|
 |..9|.7.|.1.|
 |---+---+---|
 |...|...|3..|
 |.2.|7..|9..|
 |8..|...|..5|
 *-----------*

Candidate 4s in box 9 shown in this complete candidate listing courtesy of Simple Sudoku:

{7}      {1489}   {1458}   {34569}  {45689}  {35689}  {158}    {35689}  {2}     
{259}    {89}     {3}      {2569}   {5689}   {1}      {578}    {4}      {6789}   
{12459}  {1489}   {6}      {23459}  {4589}   {235789} {1578}   {35789}  {13789} 
{134}    {5}      {1478}   {19}     {2}      {9}      {6}      {3789}   {34789} 
{126}    {167}    {127}    {8}      {3}      {4}      {257}    {2579}   {79}     
{2346}   {3468}   {9}      {56}     {7}      {56}     {2458}   {1}      {348}   
{14569}  {14679}  {1457}   {124569} {145689} {25689}  {3}      {2678}   {14678} 
{13456}  {2}      {145}    {7}      {14568}  {3568}   {9}      {68}     {1468}   
{8}      {134679} {147}    {123469} {1469}   {2369}   {1247}   {267}    {5}     


Not sure why it's described as diabolical. Solved with singles and pairs only:!:
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