The New Sudoku Players' Forum

[richardm]

Here's one from the AA in-flight mag I did on the way back from Chicago. Managed it without PM, had some nice devices. I'd be interested to hear whether others make lighter work of this than I did.

Code: Select all

4.. ... 3.5
12. 5.8 ..9
.7. ... .1.

.8. 2.5 .3.
... ... ...
.6. 7.4 .2.

.4. ... .6.
9.. 4.6 .73
6.7 ... ..1


Richard

[re'born]

Here's one from the AA in-flight mag I did on the way back from Chicago. Managed it without PM, had some nice devices. I'd be interested to hear whether others make lighter work of this than I did.

Code: Select all

4.. ... 3.5
12. 5.8 ..9
.7. ... .1.

.8. 2.5 .3.
... ... ...
.6. 7.4 .2.

.4. ... .6.
9.. 4.6 .73
6.7 ... ..1


Richard

Singles take us to

Code: Select all

 *--------------------------------------------------------------------*
 | 4      9      6      | 1      27     27     | 3      8      5      |
 | 1      2      3      | 5      6      8      | 7      4      9      |
 | 58     7      58     | 39     4      39     | 2      1      6      |
 |----------------------+----------------------+----------------------|
 | 7      8      19     | 2      19     5      | 6      3      4      |
 | 2      135    4      | 6      8      139    | 159    59     7      |
 | 35     6      159    | 7      139    4      | 159    2      8      |
 |----------------------+----------------------+----------------------|
 | 358    4      158    | 39     13579  1379   | 59     6      2      |
 | 9      15     2      | 4      15     6      | 8      7      3      |
 | 6      35     7      | 8      2359   239    | 4      59     1      |
 *--------------------------------------------------------------------*


where a skyscraper eliminates 1 from r7c3, which gives us r7c1=3 (else we would have a deadly pattern in r37c13<58>). The puzzles now resolves with singles.

[underquark]

Some pretty colours on 3 and 1 solve it. I like colours, mind you.

[Pat]

Code: Select all

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



a skyscraper eliminates 1 from r7c3, which gives us r7c1=3
(else we would have a deadly pattern in r37c13<58>)

without assuming Uniqueness-Of-Answer,
i'd need two Turbot Fish

[daj95376]

This puzzle has one of my favorite contradictory patterns: one-verses-multiple. However, fish and colors almost always end up replacing it. In this case, re'born did it with a skyscraper.

Either cell [r8c2]=1 or else the three cells [r5c2],[r7c3],[r8c5] contain <1>. However, [r5c2]=1 removes <1> from [r5c6], and [r8c5]=1 removes <1> from [r46c5]. This leaves [b5] void of <1> and forces [r8c2]=1.