The New Sudoku Players' Forum

[rds2301]

..4..5.1.1.
..7.1...5
.5.249...
.....3.9.
3.6...5.7
.9.8.....
...186.7.
7...9.1..
.6.3..9..
I can get to this step
..4735.19
9.7618..5
.5.2497..
.7.4.3.9.
3.69215.7
.9.8.7...
5.9186.7.
7..59.1..
.6.37.95.
at that point the there the 3 rows in the left column all need a 1, but because there is a 1 in r5c6, there are not 3 places a 1 could go in the left column.
I copied this from a newspaper and it was suppose to be only medium
I checked the paper and I have it correct but never got the next day to see if there was a mistake or was a solution.

[rubylips]

First of all, you've mistyped the first row of the initial puzzle, which should read:

Code: Select all

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


You've gone wrong quite early in your solution. I'd advise you to start agin from the following position and think about where the 1 belongs in Column 2:

Code: Select all

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



[ronk]

I can get to this step

Code: Select all

..4735.19
9.7618..5
.5.2497..
.7.4.3.9.
3.69215.7
.9.8.7...
5.9186.7.
7..59.1..
.6.37.95.

There are a number of incorrect placements in your grid. It's correct up to this point.

Code: Select all

 *-----------*
 |..4|735|.19|
 |9.7|618|..5|
 |.5.|249|7..|
 |---+---+---|
 |.7.|..3|.9.|
 |3.6|92.|5.7|
 |.9.|8..|...|
 |---+---+---|
 |5.9|186|.7.|
 |7..|.9.|1..|
 |.6.|3..|9..|
 *-----------*


[Cec]

"... the 3 rows in the left column all need a 1.."

Hi rds2301 - I found your above description somewhat confusing. Amongst other things, a puzzle grid contains nine columns numbered 1 to 9 and it's better to refer to a specific column number eg. c5 or c8 etc. This and other recommended terminology is better explained if you click here
Cec