The New Sudoku Players' Forum

[ronk]

It seemed to me as though your britches were overfull. In a few places.

Your propensity for personal attack virtually guarantees I won't be posting to you again ... so be happy.

[wapati]

This one has an xy and four patterns required, turbots, ERs or kites and skyscrapers, you chose!

Code: Select all

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


[wapati]

Finned swordfish in here, otherwise not too tough.

Code: Select all

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

[wapati]

X, XY, XYZ if you want, and several ER/kite/sky types.

Code: Select all

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

[wapati]

No big fish, lots of wings!

Code: Select all

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


[wapati]

This one has a swordfish and a jellyfish, although the jelly can be avoided using ERs.

Code: Select all

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

[wapati]

This one is a hoot if you ignore the UR1 until you have seen the xyz and two sashimi swordfish.

Otherewise, 3 easy patterns and UR1.

Code: Select all

..6..8.13
.8.9.....
9..34..7.
.738..4.9
..1...32.
2........
...48....
1.9.3..4.
7..1....6


[Carcul]

Otherewise, 3 easy patterns and UR1.

The UR is enough:

Code: Select all

 *------------------------------------------------------*
 | 4     25    6  | 257   257   8    | 9     1     3    |
 | 3     8     7  | 9     1256  1256 | 256   56    4    |
 | 9     1     25 | 3     4     256  | 2568  7     258  |
 |----------------+------------------+------------------|
 | 56    7     3  | 8     12    12   | 4     56    9    |
 | 8     569   1  | 567   5679  4    | 3     2     57   |
 | 2     569   4  | 567   5679  3    | 1567  8     157  |
 |----------------+------------------+------------------|
 | 56    3     25 | 4     8     2567 | 1257  9     1257 |
 | 1     256   9  | 256   3     2567 | 2578  4     2578 |
 | 7     4     8  | 1     25    9    | 25    3     6    |
 *------------------------------------------------------*


The UR in cells r4c56/r2c568 implies r2c7=2 which solves the puzzle.

Carcul

[Carcul]

This one has a swordfish and a jellyfish, although the jelly can be avoided using ERs.

Even simpler (and without chains):

Code: Select all

 *------------------------------------------------------*
 | 1     7     8   | 4     2     69   | 69    3     5   |
 | 2     5     46  | 36    369   7    | 1469  8     149 |
 | 3     469   469 | 1     8     5    | 7     46    2   |
 |-----------------+------------------+-----------------|
 | 7     46    3   | 2     1     468  | 5     9     48  |
 | 5     469   2   | 7     69    4689 | 468   1     3   |
 | 469   8     1   | 36    5     3469 | 2     46    7   |
 |-----------------+------------------+-----------------|
 | 89    3     7   | 5     4     1    | 89    2     6   |
 | 48    2     5   | 9     36    36   | 148   7     148 |
 | 469   1     469 | 8     7     2    | 3     5     49  |
 *------------------------------------------------------*


If r6c6 is not "4,9" then the puzzle would have more than one solution, due to the AUP in cells r2c45/r6c46/r8c56. So, r6c6=4 or r6c6=9 and the puzzle is solved.

Carcul

[daj95376]

Carcul, my understanding of AUP is extremely limited, and I believe that you wrote all of the primary information on the topic, but it seems to me that the <9> in [r2c5] prevents you from making an AUP claim based on the contents of [r6c6] alone. (Yes, I understand that [r2c5]<>9 in the solution, but we don't know that at this point in your argument.)

For the Record: I'm very impressed with your use of AUPs in other puzzles. I can never see them until you indicate they're there. I think this is a technique that should be incorporated into more solvers -- including mine.

[re'born]

daj95376,

(6,6)!9 > (6,1)9 > (5,2)!9 > (3,2)9 > (3,3)!9 > (9,3)9 > (9,9)!9 > (2,9)9 > (2,5)!9.

Is there a shorter way to see it, Carcul?

[daj95376]

daj95376,

(6,6)!9 > (6,1)9 > (5,2)!9 > (3,2)9 > (3,3)!9 > (9,3)9 > (9,9)!9 > (2,9)9 > (2,5)!9.

Is there a shorter way to see it, Carcul?

I suspect that we have a miscommunication. Let me explain further. I may have misundersood the logic behind AUP?

Carcul claims there is an AUP that forces [r6c6]={49}. If you examine the cells with <36> in [r268c456], you'll see that a Deadly Pattern would exist if [r2c5]<>9 and [r6c6]<>{49}. My concern is that only half of the and condition was used in Carcul's argument.

FYI: I call this an ADP for Almost Deadly Pattern.

[wapati]

Otherewise, 3 easy patterns and UR1.

The UR is enough:

Code: Select all

 *------------------------------------------------------*
 | 4     25    6  | 257   257   8    | 9     1     3    |
 | 3     8     7  | 9     1256  1256 | 256   56    4    |
 | 9     1     25 | 3     4     256  | 2568  7     258  |
 |----------------+------------------+------------------|
 | 56    7     3  | 8     12    12   | 4     56    9    |
 | 8     569   1  | 567   5679  4    | 3     2     57   |
 | 2     569   4  | 567   5679  3    | 1567  8     157  |
 |----------------+------------------+------------------|
 | 56    3     25 | 4     8     2567 | 1257  9     1257 |
 | 1     256   9  | 256   3     2567 | 2578  4     2578 |
 | 7     4     8  | 1     25    9    | 25    3     6    |
 *------------------------------------------------------*


The UR in cells r4c56/r2c568 implies r2c7=2 which solves the puzzle.

Carcul

Sorry, didn't notice that.

[wapati]

In some order:

Jellyfish, required for pattern solving, I think.

BUG1 required, I think.

One of ER, grouped-x or Turbots, should do it!

Code: Select all

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


[wapati]

Busy puzzle, in the pattern sense.

XYZ, xy, x and about 5 of ER/grouped-x sort of patterns.

(skyscrapers kites turbots ... that type.)

Code: Select all

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