The New Sudoku Players' Forum

[brec]

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]

[emm]

Where is the 4 in box 9?

[Animator]

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))

[QBasicMac]

in my opinion

Heh - mine, too.

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

Mac

[brec]

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...

[CathyW]

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