Solve Method B

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Solve Method B

Postby davbro80129 » Wed Jun 11, 2008 4:03 am

Could some one please explain to me based on the following definition for Solve Method B how value 1 in block at [D1] must lie in column 1? I ran this same scenario on a different solver and it identified the naked pair and naked triple that allowed me to solve it utilizing that strategy.

(www.scanraid.com/sudoku.htm) (This grid uses row J instead of row I)

NAKED PAIR (Box): G9/H8 removes 1 from H7
NAKED PAIR (Box): G9/H8 removes 9 from H7
NAKED PAIR (Box): G9/H8 removes 9 from J9
NAKED TRIPLE (Row): J2/J5/J9 removes 6/7 from J1
NAKED TRIPLE (Row): J2/J5/J9 removes 6 from J3
NAKED TRIPLE (Box): G3/J1/J3 removes 1 from H2

Definition for Solve Method B (from www.sudokusolver.co.uk):

Look at a row in the solution grid to see if there are any numbers that occur only in a specific block. That number must be in that row, so eliminate that number from other cells in the block. Repeat for columns.

The same the other way round - look at a block in the solution grid to see if there are any numbers in it that occur only in a specific row or column. That number must be in that block, so eliminate the number from cells in the row or column outside the block.

Added missing row I/J.

Starting Solve Method B
Code: Select all
   |  1      2      3      4      5      6      7      8      9         
---+---------------------------------------------------------------
A  |  2      4      7      8      56     569    159    3      1569     
B  |  5      16     169    69     3      7      4      8      2         
C  |  69     3      8      1      4      2      59     7      569       
D  |  136    9      1346   356    7      568    2      16     1468     
E  |  67     8      5      2      1      4      3      69     679       
F  |  1367   2      1346   36     9      68     17     5      14678     
G  |  8      5      19     7      2      3      6      4      19       
H  |  4      167    2      569    8      569    1579   19     3         
I  |  3679   67     369    4      56     1      8      2      579


The value 1 in block at [D1] must lie in column 1..
Ending Solve Method B
Last edited by davbro80129 on Wed Jun 11, 2008 8:16 am, edited 2 times in total.
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Re: Solve Method B

Postby wintder » Wed Jun 11, 2008 4:47 am

davbro80129 wrote:Could some one please explain to me based on the following definition for Solve Method B


Go to that site, ask them.
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Postby Pat » Wed Jun 11, 2008 8:18 am

davbro80129 wrote:Could some one please explain to me based on the following definition for Solve Method B how value 1 in block at [D1] must lie in column 1? I ran this same scenario on a different solver and it identified the naked pair and naked triple that allowed me to solve it utilizing that strategy.

( http://www.scanraid.com/sudoku.htm ) (This grid uses row J instead of row I)

NAKED PAIR (Box): G9/H8 removes 1 from H7
NAKED PAIR (Box): G9/H8 removes 9 from H7
NAKED PAIR (Box): G9/H8 removes 9 from J9
NAKED TRIPLE (Row): J2/J5/J9 removes 6/7 from J1
NAKED TRIPLE (Row): J2/J5/J9 removes 6 from J3
NAKED TRIPLE (Box): G3/J1/J3 removes 1 from H2

Definition for Solve Method B (from http://www.sudokusolver.co.uk ):

Look at a row in the solution grid to see if there are any numbers that occur only in a specific block. That number must be in that row, so eliminate that number from other cells in the block. Repeat for columns.

The same the other way round - look at a block in the solution grid to see if there are any numbers in it that occur only in a specific row or column. That number must be in that block, so eliminate the number from cells in the row or column outside the block.

Starting Solve Method B
Code: Select all
   |  1       2       3       4       5       6       7       8       9   
---+-----------------------------------------------------------------------
A  |  2       4       7       8       56      569     159     3       1569
B  |  5       16      169     69      3       7       4       8       2   
C  |  69      3       8       1       4       2       59      7       569 
---+-----------------------------------------------------------------------
D  |  136     9       1346    356     7       568     2       16      1468
E  |  67      8       5       2       1       4       3       69      679 
F  |  1367    2       1346    36      9       68      17      5       14678
---+-----------------------------------------------------------------------
G  |  8       5       19      7       2       3       6       4       19   
H  |  4       167     2       569     8       569     1579    19      3
J  |
---+-----------------------------------------------------------------------



The value 1 in block at [D1] must lie in column 1..
Ending Solve Method B


hi davbro80129

too bad you only posted the top 8 rows

but assuming row 9 has no surprises ( no 1 possible in r9c1 ),
i expect they're trying to tell us that
the 1 for column 1 must be in box 4 ( which may be the next available step even if it won't solve the puzzle )
    i say "trying" because what they actually said is the reverse---
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