The New Sudoku Players' Forum

[999_Springs]

Code: Select all

...6.28..
...3....1
.95...426
.7.483...
.........
...125.8.
541...23.
6..2.7...
..85.....

with 1.33 billion views, i believe that this may be the most viewed sudoku puzzle in the world (should link to 1:25)

i have removed r2c6 to make it hard enough to be posted here. there is no other sub-puzzle with a higher se rating (thanks gridchecker)

hopefully you can do better than katy perry's attempt

i really need to go to a party that looks like that at some point in my lifetime

[RSW]

Code: Select all

 +-------+------------+---------+
 | 4 1 7 | 6  59  2   | 8  59 3 |
 | 2 8 6 | 3  459 49  | 59 7  1 |
 | 3 9 5 | 78 17  18  | 4  2  6 |
 +-------+------------+---------+
 | 1 7 2 | 4  8   3   | 69 69 5 |
 | 8 5 4 | 79 679 69  | 3  1  2 |
 | 9 6 3 | 1  2   5   | 7  8  4 |
 +-------+------------+---------+
 | 5 4 1 | 89 69  689 | 2  3  7 |
 | 6 3 9 | 2  14  7   | 15 45 8 |
 | 7 2 8 | 5  3   14  | 16 46 9 |
 +-------+------------+---------+


(5=9)r2c7-(9=4)r2c6-(4=1)r9c6-(1=4)r8c5-(4=5)r8c8 => -5r8c7 -5r1c8; stte

Note, according to my solver, up to 5 clues can be removed from this puzzle. Here are all the combinations of 4 or 5 fewer clues:
Combinations of 4 fewer clues:
-3r2c4 -6r3c9 -4r4c4 -4r7c2 000602800000000001095000420070083000000000000000125080501000230600207000008500000
-3r2c4 -6r3c9 -4r4c4 -2r8c4 000602800000000001095000420070083000000000000000125080541000230600007000008500000
-3r2c4 -6r3c9 -4r7c2 -2r8c4 000602800000000001095000420070483000000000000000125080501000230600007000008500000
-3r2c4 -4r4c4 -4r7c2 -2r8c4 000602800000000001095000426070083000000000000000125080501000230600007000008500000
-2r3c8 -6r3c9 -4r7c2 -2r8c4 000602800000300001095000400070483000000000000000125080501000230600007000008500000
-2r3c8 -6r3c9 -4r7c2 -5r9c4 000602800000300001095000400070483000000000000000125080501000230600207000008000000
-2r3c8 -4r4c4 -4r7c2 -2r8c4 000602800000300001095000406070083000000000000000125080501000230600007000008500000
-2r3c8 -4r4c4 -4r7c2 -5r9c4 000602800000300001095000406070083000000000000000125080501000230600207000008000000
-6r3c9 -4r4c4 -4r7c2 -2r8c4 000602800000300001095000420070083000000000000000125080501000230600007000008500000
-6r3c9 -4r4c4 -4r7c2 -5r9c4 000602800000300001095000420070083000000000000000125080501000230600207000008000000
Combinations of 5 fewer clues:
-3r2c4 -6r3c9 -4r4c4 -4r7c2 -2r8c4 000602800000000001095000420070083000000000000000125080501000230600007000008500000

None of these appear to make the puzzle any more difficult.

[Leren]

Code: Select all

*--------------------------------*
| 4 1 7 | 6   59  2   | 8   59 3 |
| 2 8 6 | 3  b459 49  |a59  7  1 |
| 3 9 5 | 78  17  18  | 4   2  6 |
|-------+-------------+----------|
| 1 7 2 | 4   8   3   | 69  69 5 |
| 8 5 4 | 79  679 69  | 3   1  2 |
| 9 6 3 | 1   2   5   | 7   8  4 |
|-------+-------------+----------|
| 5 4 1 | 89  69  689 | 2   3  7 |
| 6 3 9 | 2  c14  7   |d1-5 45 8 |
| 7 2 8 | 5   3   14  | 16  46 9 |
*--------------------------------*

(5) r2c7 = (5-4) r2c5 = (4-1) r8c5 =(1) r8c7 => - 5 r8c7; stte

Leren

[SteveG48]

Code: Select all

 *--------------------------------------------------*
 | 4    1    7    | 6    5-9  2    | 8   b59   3    |
 | 2    8    6    | 3    459  49   | 59   7    1    |
 | 3    9    5    | 78  a17   18   | 4    2    6    |
 *----------------+----------------+----------------|
 | 1    7    2    | 4    8    3    | 69   69   5    |
 | 8    5    4    | 79  a679  69   | 3    1    2    |
 | 9    6    3    | 1    2    5    | 7    8    4    |
 *----------------+----------------+----------------|
 | 5    4    1    | 89  a69   689  | 2    3    7    |
 | 6    3    9    | 2   a14   7    | 15  b45   8    |
 | 7    2    8    | 5    3    14   | 16   46   9    |
 *--------------------------------------------------*


(9=1674)r3578c5 - (4=59)r18c8 => -9 r1c5 ; stte

[rjamil]

Code: Select all

 +---------+----------------+-------------+
 | 4  1  7 | 6   59     2   | 8     59  3 |
 | 2  8  6 | 3   (4-5)9 49  | (5)-9 7   1 |
 | 3  9  5 | 78  17     18  | 4     2   6 |
 +---------+----------------+-------------+
 | 1  7  2 | 4   8      3   | 69    69  5 |
 | 8  5  4 | 79  679    69  | 3     1   2 |
 | 9  6  3 | 1   2      5   | 7     8   4 |
 +---------+----------------+-------------+
 | 5  4  1 | 89  69     689 | 2     3   7 |
 | 6  3  9 | 2   (14)   7   | (1-5) 45  8 |
 | 7  2  8 | 5   3      14  | 16    46  9 |
 +---------+----------------+-------------+

Strong Wing: SL 1 @ r8c57 4 @ r28c5 5 @ r28c7 r2c57 => -9 @ r2c7 => -5 @ r8c7 r2c5; stte
(Similar to as Leren's OTP move.)

R. Jamil

[jco]

Hello,

After basics

Code: Select all

 .------------------------------.
 | 4 1 7 | 6  59  2   | 8  59 3 |
 | 2 8 6 | 3 c459 49  |b59 7  1 |
 | 3 9 5 | 78 17  18  | 4  2  6 |
 |-------+------------+---------|
 | 1 7 2 | 4  8   3   | 69 69 5 |
 | 8 5 4 | 79 679 69  | 3  1  2 |
 | 9 6 3 | 1  2   5   | 7  8  4 |
 |-------+------------+---------|
 | 5 4 1 | 89 69  689 | 2  3  7 |
 | 6 3 9 | 2 d4-1 7   |a15 45 8 |
 | 7 2 8 | 5  3   14  | 16 46 9 |
 '------------------------------'

H2-Wing (1=5)r8c7-r2c7=(5-4)r2c5=(4)r8c5 => -1 r8c5; ste

Regards,
jco

[rjamil]

Another OTP move:

Code: Select all

 +---------+---------------+------------+
 | 4  1  7 | 6   59   2    | 8    59  3 |
 | 2  8  6 | 3   459  (49) | (59) 7   1 |
 | 3  9  5 | 78  17   18   | 4    2   6 |
 +---------+---------------+------------+
 | 1  7  2 | 4   8    3    | 69   69  5 |
 | 8  5  4 | 79  679  69   | 3    1   2 |
 | 9  6  3 | 1   2    5    | 7    8   4 |
 +---------+---------------+------------+
 | 5  4  1 | 89  69   689  | 2    3   7 |
 | 6  3  9 | 2   4-1  7    | (15) 45  8 |
 | 7  2  8 | 5   3    (14) | 6-1  46  9 |
 +---------+---------------+------------+

Almost Locked Set move: 1459 @ r29c6 r28c7 => -1 @ r8c5 r9c7; stte

R. Jamil