The New Sudoku Players' Forum

[International_DBA]

I have just published a book of tough sudoku puzzles.
You can see it here: https://mybook.to/Tough_Sudoku_Volume_1
That link should take you to the Amazon site closest to where you live.
The free sample shows up to puzzle 18.
Give me a number between 19 and 400 and I will show you that puzzle.

[urhegyi]

205

[International_DBA]

If I could work out how to add an image in this forum, I would cut one out to prove to you that this is in fact puzzle 205.
Hopefully on this occasion you will believe me:
https://www.sudokuwiki.org/sudoku.htm?b ... 0020700900

[yzfwsf]

Looks like a random computer generated puzzle. skfr6.6, my solver rate it as 1140

Hidden Text: Show

Code: Select all

Hidden Single: 9 in b7 => r8c3=9
Hidden Single: 9 in b8 => r7c5=9
Hidden Single: 2 in b4 => r5c3=2
Hidden Single: 3 in b4 => r5c2=3
Hidden Single: 4 in b4 => r4c1=4
Hidden Single: 7 in b4 => r4c3=7
Hidden Single: 9 in b3 => r2c8=9
Hidden Single: 9 in b6 => r5c9=9
Hidden Single: 9 in b5 => r4c6=9
Hidden Single: 8 in b5 => r5c6=8
Hidden Single: 8 in b6 => r4c8=8
Full House: r4c5=6
Hidden Single: 7 in b5 => r5c5=7
Hidden Single: 1 in b5 => r5c4=1
Hidden Single: 5 in b5 => r6c4=5
Full House: r6c5=2
Hidden Single: 5 in b6 => r5c7=5
Full House: r5c1=6
Full House: r6c1=9
Hidden Single: 2 in b2 => r2c4=2
Locked Candidates 2 (Claiming): 1 in r1 => r2c7<>1
Locked Candidates 2 (Claiming): 5 in r7 => r8c8<>5,r8c9<>5,r9c8<>5,r9c9<>5
Hidden Single: 5 in r8 => r8c6=5
Locked Candidates 2 (Claiming): 8 in r8 => r9c9<>8
Locked Pair: in r7c2,r8c2 => r9c1<>1,r9c3<>6,r2c2<>16,r3c2<>6,
Hidden Single: 1 in b1 => r2c1=1
Hidden Pair: 28 in r3c9,r8c9 => r3c9<>456,r8c9<>46
Skyscraper : 4 in r8c4,r9c9 connected by r1c49 => r8c7,r9c5 <> 4
Hidden Single: 4 in b9 => r9c9=4
Swordfish:6c249\r178  => r1c3678,r78c78<>6
WXYZ-Wing: 3456 in r1c349,r3c5,Pivot Cell Is r1c4 => r1c6,r3c3<>3
Hidden Single: 3 in b2 => r3c5=3
Hidden Single: 3 in b8 => r9c6=3
Hidden Single: 6 in b8 => r8c4=6
Full House: r1c4=4
Hidden Single: 4 in b8 => r8c5=4
Full House: r9c5=1
Hidden Single: 6 in b7 => r7c2=6
Hidden Single: 6 in b9 => r9c8=6
Hidden Single: 1 in b7 => r8c2=1
Hidden Single: 6 in b6 => r6c7=6
Full House: r6c8=3
Hidden Single: 3 in b9 => r8c7=3
Hidden Single: 8 in b9 => r8c9=8
Full House: r8c8=2
Hidden Single: 2 in b3 => r3c9=2
Hidden Single: 6 in b3 => r1c9=6
Full House: r7c9=5
Hidden Single: 6 in b2 => r2c6=6
Full House: r1c6=7
Hidden Single: 3 in b1 => r1c3=3
Hidden Single: 6 in b1 => r3c3=6
Hidden Single: 5 in b1 => r3c1=5
Full House: r9c1=8
Full House: r9c3=5
Full House: r2c3=8
Hidden Single: 5 in b3 => r1c8=5
Full House: r1c7=1
Hidden Single: 1 in b9 => r7c8=1
Full House: r7c7=7
Full House: r3c8=7
Hidden Single: 8 in b3 => r3c7=8
Full House: r3c2=4
Full House: r2c2=7
Full House: r2c7=4


[Leren]

Code: Select all

*-----------*
|29.|.8.|...|
|...|.5.|..3|
|...|9.1|...|
|---+---+---|
|.5.|3..|2.1|
|...|...|.4.|
|.81|..4|..7|
|---+---+---|
|3.4|8.2|...|
|7..|...|...|
|.2.|7..|9..|
*-----------*
29..8........5...3...9.1....5.3..2.1.......4..81..4..73.48.2...7.........2.7..9..   

Code: Select all

*---------------------------------------------*
| 2   9  356  | 46  8    367 | 1467  1567 456 |
| 1   47 68   | 2   5    67  | 4678  9    3   |
| 58  47 3568 | 9   34   1   | 4678  2567 28  |
|-------------+--------------+----------------|
| 4   5  7    | 3   6    9   | 2     8    1   |
| 6   3  2    | 1   7    8   | 5     4    9   |
| 9   8  1    | 5   2    4   | 36    36   7   |
|-------------+--------------+----------------|
| 3   16 4    | 8   9    2   | 167   1567 56  |
| 7  b16 9    |a46 c134  5   | 13468 1236 28  |
| 58  2  58   | 7  d13-5 36  | 9     136  46  |
*---------------------------------------------*

1. (4=6) r8c4 - (6=1) r8c2 - r8c5 = (1) r9c5 => - 5 r9c5 => r9c9 = 4;

Code: Select all

*--------------------------------------------*
| 2  9  e3-56 |a46  8   367 | 1467 1567  b56 |
| 1  47  68   | 2   5   67  | 4678 9      3  |
| 58 47 d3568 | 9  c34  1   | 4678 2567   28 |
|-------------+-------------+----------------|
| 4  5   7    | 3   6   9   | 2    8      1  |
| 6  3   2    | 1   7   8   | 5    4      9  |
| 9  8   1    | 5   2   4   | 36   36     7  |
|-------------+-------------+----------------|
| 3  16  4    | 8   9   2   | 167  1567   56 |
| 7  16  9    | 46  134 5   | 1368 1236   28 |
| 58 2   58   | 7   13  36  | 9    136    4  |
*--------------------------------------------*

2. (6=4) r1c4 [=5 r1c9] - (4=3) r3c5 - r3c3 = (3) r1c3 => - 56 r1c3; stte

Leren

[International_DBA]

Yes, it is a random computer generated puzzle.
I wrote the program myself in 2012.

[Mathimagics]

If I could work out how to add an image in this forum ...

We have blown our quota of file attachments, and so you need to inline the image ... see here for one simple way to host images.

Cheers
MM

[yzfwsf]

Provide a puzzle that is randomly generated by my solver.

Code: Select all

.1.........5.....36..3..24...69..7......5..9..37.....2..48...2528..6...45....16.. skfr6.6

[m_b_metcalf]

Wasn't there a time when it was considered desirable for a published puzzle to have 180 degree (crossword) symmetry?

Code: Select all

 . . . . . . 1 . .
 . . . . 2 . . 3 4
 . . 1 . 4 . 5 6 .
 . 7 . . . 2 . . 6
 . . 5 . 8 . 3 . .
 8 . . 3 . . . 9 .
 . 8 9 . 3 . 7 . .
 2 4 . . 9 . . . .
 . . 7 . . . . . .   SE = 6.6

......1......2..34..1.4.56..7...2..6..5.8.3..8..3...9..89.3.7..24..9......7......   

[jco]

y m_b_metcalf » Sun Jun 26, 2022 10:48 am
Wasn't there a time when it was considered desirable for a published puzzle to have 180 degree (crossword) symmetry?

Code: Select all

. . . . . . 1 . .
 . . . . 2 . . 3 4
 . . 1 . 4 . 5 6 .
 . 7 . . . 2 . . 6
 . . 5 . 8 . 3 . .
 8 . . 3 . . . 9 .
 . 8 9 . 3 . 7 . .
 2 4 . . 9 . . . .
 . . 7 . . . . . .   SE = 6.6

......1......2..34..1.4.56..7...2..6..5.8.3..8..3...9..89.3.7..24..9......7......

---

Code: Select all

.-----------------------------------------------------------------------------.
| 345679  23569   2468-3  | 56789   567     356789  | 1       278     2789    |
| 5679    569     68      | 156789  2       156789  | 9-8     3       4       |
| 379     239     1       | 789     4       3789    | 5       6       2789    |
|-------------------------+-------------------------+-------------------------|
| 139-4   7      b34#     | 159-4   15      2       |c48#     158-4   6       |
| 1469    1269    5       | 14679   8       14679   | 3       1247    127     |
| 8       126     246     | 3       1567    14567   | 24      9       1257    |
|-------------------------+-------------------------+-------------------------|
| 156     8       9       | 12456   3       1456    | 7       1245    125     |
| 2       4      a36#     | 1578-6  9       1578-6  |d68#     158     1358    |
| 1356    1356    7       | 124568  156     14568   | 2469-8  12458   123589  |
'-----------------------------------------------------------------------------'

1. (6=3)r8c3 - (3=4)r4c4 - (4=8)r4c7 - (8=6)r8c7 - (6=3)r8c3 Loop => -8 r2c7, -6 r8c46, -3 r1c3, -4 r4c148; lclste
Nice belt of BVCs.