dailysudoku.com

Hi,
I know, nobody has yet solved the previous Zen sudoku.
Now on the 1. April it's time for an other one.
We just take the old (unsolved) one:
6.2.5....
.....4.3.
.........
43...8...
.1....2..
...... ...

Hi,
may I suggest from Aplha star r1c7 to eliminate 3 from r9c9:
2 6 135 9 57 157 37 4 8
. . .a. . .. ... Aa . .
. . ... . ...

Hi David,

That is exact what I had in mind, and that you have suggested in one of the last emails.

Instead of starting from an ALPHA star with 2 digits, we could also start from a "double" star. So ...

Hi,
Some comments about using the DIC (Double Implication Chains):
- it depends on your starting Alpha star.
- it depends about how many stars you are willing to follow (how deep you are ready to go). ...

Hi,
The Nightmare from 24 Mar can be used for a basic training in DIC - Double Impliation Chains.

Starting from:
........8
.1..843..
28..7....
.541.....
.7.....2.
.....541.
....9..31
..681..7.
5..... ...

Hi,
The Nightmare from 25 Mar:

5.....3..
.7...5.9.
3....6..2
..4.32...
..5...1..
...75.4..
9..8....1
.8.5...7.
..1.....4

After warm up with:
Hidden Pair 1 4 in r2c1 and r2c5,
Nacked Pair 6 8 in r2c7 ...

Thank you, guys.
I used also double implication chains, but ... I had to travel to a couple of other galaxies, until I got to the solution.
It is ZEN.
Hope that you are finding a way, your way ...

W ...

Hi,
could not resist to take a look at this one.
I found a nice 5 star in the following places:
r2c6 = 47
r2c7 = 47
r3c5 = 347
r9c5 = 47
r9c7 = 47
Staring with r2c6 as alpha and following only the dig ...

Hi,
Just tried this one, in order to check that I am still alive ...

I foud for digit 3 a X-Wing on Column in: r2c2 r2c6 r5c2 r5c6
so I could eliminate it from: r3c2, r3c6, r4c2, r4c6, r9c6
and so 3 ...

Yes, I called it Zen.
No single response in this forum is confirming it's name.
I know how to get to the solution, but it takes a long time, like in the Zen training. No brute force is needed.

If som ...

Sorry for not beeing active in this forum for a longer time ...
I am active now in a project in UK where I have similar excitement as solving the "almost imposible" Sudoku's.
In the airport, I noticed ...

Hi,

Yup the digit 7 is the key for this Sudoku.
Looking it from the point of view of the DIC (Double Implication Chains) by starting from a pair, it can also be solved.

Here the key for the solutio ...

Thank you David. You can explain better than me.

P.S. I was in a project "on the field" in a different country, and I had no time except for sleeping and toilet. The rest was like solving Sudoku.
Now ...

Hi,
This one is special ...
. . . . . 1 2 . .
. 3 . . 2 4 5 . .
. 6 2 . 5 7 . . .
5 . . . 6 . . . 7
2 . . . 4 . . . 8
9 . . . 3 . . . 1
. . . 4 . . 1 9 .
. . 8 5 . . . 6 .
. ...

Hi,
The second one is also nice:
2 . . . . . . . .
7 1 6 . . . . . .
5 . . 6 . . 1 7 9
. 7 . 1 . 3 . . .
. . 2 5 . 6 4 . .
. . . 2 . 8 . 9 .
8 9 5 . . 4 . . 1
. . . . . . 2 4 3 ...

Hi,

after setting 22 digits in the:
2 5 . 8 . . . . .
. . . . 9 . 8 . 2
9 . . 4 . 7 . . .
6 4 . . . . . 9 .
. 9 . 1 . 3 . 4 .
. 7 . . . . . 2 1
. . . 5 . 4 . . 7
7 . 6 . 8 . . ...

Hi,

The distribution of 6's is relly BEAUTIFULL.
If we eliminate first the one from r2c9 we are left with exact 2 occurences of digit 6 in every block!

It would be a pitty to distroy it with the XY- ...

Hi Alan,

If you would be a girl, I could get in love with you.
We have the same understanding of Sudoku.

Looking always for a puzzle that puts new problems for solving it!
How we solve it - that's t ...

Hi,

After the first 25 digits, I detected a Naked Triple 3 5 7 in 3x3 Block 4.
Could so eliminate 5 from r4c5 and 7 from r5c4.
So I could pinpoint other 3 digits:
5 in r4c3 - Unique Horizontal
7 ...

Hi,

I found a Hidden Triple 5 7 8 in r1c8 r2c7 r2c8
and could eliminate 6 from r1c8, r2c7, r2c8.

Sometimes later, I found Hidden Pair 3 8 in r8c3 and r9c2 (in 3x3 Block)
and could eliminate it from ...