## Beginner struggling with medium puzzle

Post the puzzle or solving technique that's causing you trouble and someone will help

### Beginner struggling with medium puzzle

I can usually solve medium puzzles from pappocom's software without listing candidates or branching but this one has got me messed up somehow. Could anyone point me one or two steps in the next direction.

Code: Select all
`Original puzzle:   9   | 4   5 |        5     |     8 | 7          8 | 9 1   | 4-------------------------   1   |       | 8   5    4   |       |   9      3   5 |       |   2   -------------------------     9 |   4 1 | 2          7 | 3     |     1       | 7   2 |   8As Far as I've gotten (not very far)   9   | 4   5 |     8  5   4 |     8 | 7   9          8 | 9 1   | 4 5 2-------------------------   1   |       | 8   5    4   |       |   9      3   5 |       |   2   -------------------------     9 |   4 1 | 2          7 | 3     |     1       | 7   2 |   8`

John
jungzimm

Posts: 7
Joined: 25 March 2006

Look for number 9 in box 4.

RW
RW
2010 Supporter

Posts: 1000
Joined: 16 March 2006

How i would try to proceed (hope i dont say too much) ?

What can be seen easily:
In box 9 (right bottom 3x3 group) 5 and 9 (both in columns 8 and 9) only can be in r89c7 (row 8, column 7 and row 9,column 7).
In column 3 (both in box 4) 1 and 3 only can go to r19c3.
78 in box 4 (both in column 3) can only go to r5c1 and r6c2, which gives a 26 pair in r45c3.

Nothing helps to find a number.
So i have to count and start with box 3, where only 3 numbers are left:
r1c7 can only be 36, r1c8 either 36, r2c8 only 1, next number.

No other 1's forced by that, but the 36-pair will help to solve the puzzle.
ravel

Posts: 998
Joined: 21 February 2006

Crazy Girl

Posts: 189
Joined: 08 November 2005

### re: Beginner struggling with Medium puzzle

jungzimm wrote:I can usually solve Medium puzzles from Pappocom's software without listing candidates or branching,
but this one has got me messed up somehow.
Could anyone point me one or two steps in the next direction.

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

As Far as I've gotten (not very far):
Code: Select all
` . 9 . | 4 . 5 | . . 8  5 . 4 | . . 8 | 7 . 9  . . 8 | 9 1 . | 4 5 2 -------+-------+------ . 1 . | . . . | 8 . 5  . 4 . | . . . | . 9 .  3 . 5 | . . . | . 2 . -------+-------+------ . . 9 | . 4 1 | 2 . .  . . 7 | 3 . . | . . 1  . . . | 7 . 2 | . 8 . `

in r2, only one place for the 1;

now the 3 for box3 must be in r1,
so we have a box-line interaction
in c3, only one place for the 3 (not in r1).

~ Pat

Pat

Posts: 3423
Joined: 18 July 2005

Thank you everyone and especailly for the pointers to the advanced techniques. It still took me a while after the 1 in Box 3 and the 59 in r89c7; but eventually I got it. I've still got a ways to go in comprehending the more advanced stuff.
jungzimm

Posts: 7
Joined: 25 March 2006