The New Sudoku Players' Forum

by **Yogi** » Sat Apr 17, 2021 10:15 pm

000007460003500000010000000700600020000010000000000008650400000000000803000000106
I was going to attach an image to go with this puzzle but it was prevented. The error message says the board attachment quota has been reached.
I have not heard about this before.

by **jco** » Sat Apr 17, 2021 10:29 pm

Hello Yogi,

You can read about it in the topic "Forum questions and feedback" (http://forum.enjoysudoku.com/attachment-limit-reached-t38602.html#p300105). This restriction was announced in January 12 (see the link). In my view, a picture is the less useful way to get the puzzle's information anyway. I always need either the board with the givens or the 81 sequence of characters to work with.
Also, one can see many old posts in the forum without the pictures, so pictures never stayed for long.

Regards,
jco

Edit: there is the option of leaving a link to somewhere else, but IMO a board or the 81 characters is a more useful way.

by **pjb** » Sat Apr 17, 2021 11:01 pm

Code: Select all: 2589 289 2589 | 12389 b2389 7 | 4 6 1259 2489 67 3 | 5 b24689 b124689 | 279 1789 1279 24589 1 67 |b289 b24689 b24689 | 23579 3789 2579 ------------------------+----------------------+--------------------- 7 3489 14589 | 6 34589 34589 | 359 2 1459 23589 234689 245689 | 23789 1 234589 | 35679 379 4579 12359 23469 124569 | 2379 234579 23459 | 35679 1379 8 ------------------------+----------------------+--------------------- 6 5 a18 | 4 a38 38-1 |a279 a79 a279 129 2479 12479 | 1279 25679 12569 | 8 45 3 2389 234789 24789 | 2789 25789 2589 | 1 45 6

(1=3)r7c35789 - (3=1)r1c5, r2c56, r3c456 => -1 r7c6; stte

or Finned swordfish of 1s (r247\c369), fin at r2c8 => -1 r1c9; stte

Phil

by **RSW** » Sat Apr 17, 2021 11:36 pm

Code: Select all: +---------------------+----------------------+-----------------+ | 2589 289 *2589 |F12389 2389 *7 | 4 6 *1259 | | 2489 67 3 | 5 24689 24689-1 | 279 1789 1279 | | 24589 1 67 | 289 24689 24689 | 23579 3789 2579 | +---------------------+----------------------+-----------------+ | 7 3489 *14589 | 6 34589 *34589 | 359 2 *1459 | | 23589 234689 245689 | 23789 1 234589 | 35679 379 4579 | | 12359 23469 124569 | 2379 234579 23459 | 35679 1379 8 | +---------------------+----------------------+-----------------+ | 6 5 *18 | 4 38 *138 | 279 79 *279 | | 129 2479 12479 | 1279 25679 12569 | 8 45 3 | | 2389 234789 24789 | 2789 25789 2589 | 1 45 6 | +---------------------+----------------------+-----------------+

Sashimi-Swordfish: (1)r147c3(4)69 => -1r2c6; stte

by **Leren** » Sun Apr 18, 2021 12:30 am

Code: Select all: *---------------------------------------------------------------* | 2589 289 2589 |b12389 c2389 7 | 4 6 1259 | | 2489 67 3 | 5 24689 a124689 | 279 1789 1279 | | 24589 1 67 |289 24689 24689 | 23579 3789 2579 | |---------------------+-----------------------+-----------------| | 7 3489 14589 | 6 34589 34589 | 359 2 1459 | | 23589 234689 245689 | 23789 1 234589 | 35679 379 4579 | | 12359 23469 124569 | 2379 234579 23459 | 35679 1379 8 | |---------------------+-----------------------+-----------------| | 6 5 18 | 4 d38 e38-1 | 279 79 279 | | 129 2479 12479 | 1279 25679 12569 | 8 45 3 | | 2389 234789 24789 | 2789 25789 2589 | 1 45 6 | *---------------------------------------------------------------*

L2 Wing : (1) r2c6 = (1-3) r1c4 = r1c5 - r7c5 = (3) r7c6 => - 1 r7c6; stte

Leren

Website · by **denis_berthier** » Sun Apr 18, 2021 5:33 am

Yogi wrote:000007460003500000010000000700600020000010000000000008650400000000000803000000106
I was going to attach an image to go with this puzzle but it was prevented. The error message says the board attachment quota has been reached.
I have not heard about this before.

Hi Yogi,
Puzzles are generally presented here in two forms: grid form and string form. The SER is also often given in order to provide a vague idea of difficulty:

Code: Select all: +-------+-------+-------+ ! 0 0 0 ! 0 0 7 ! 4 6 0 ! ! 0 0 3 ! 5 0 0 ! 0 0 0 ! ! 0 1 0 ! 0 0 0 ! 0 0 0 ! +-------+-------+-------+ ! 7 0 0 ! 6 0 0 ! 0 2 0 ! ! 0 0 0 ! 0 1 0 ! 0 0 0 ! ! 0 0 0 ! 0 0 0 ! 0 0 8 ! +-------+-------+-------+ ! 6 5 0 ! 4 0 0 ! 0 0 0 ! ! 0 0 0 ! 0 0 0 ! 8 0 3 ! ! 0 0 0 ! 0 0 0 ! 1 0 6 ! +-------+-------+-------+ 000007460003500000010000000700600020000010000000000008650400000000000803000000106 SER = 6.7

A dot is generally used instead of a 0, because it makes it easier to see the givens (which is a must when they have an interesting pattern).

Code: Select all: +-------+-------+-------+ ! . . . ! . . 7 ! 4 6 . ! ! . . 3 ! 5 . . ! . . . ! ! . 1 . ! . . . ! . . . ! +-------+-------+-------+ ! 7 . . ! 6 . . ! . 2 . ! ! . . . ! . 1 . ! . . . ! ! . . . ! . . . ! . . 8 ! +-------+-------+-------+ ! 6 5 . ! 4 . . ! . . . ! ! . . . ! . . . ! 8 . 3 ! ! . . . ! . . . ! 1 . 6 ! +-------+-------+-------+ .....746...35......1.......7..6...2.....1............865.4...........8.3......1.6 SER = 6.7

This is much less costly, in terms of storage, than an image.

As to how to produce such graphics, it's easy to keep an empty grid and to fill manually a copy of it with the givens. Alternatively, you can download CSP-Rules and use the "pretty-print-sudoku-string" function. (Probably, other solvers can do the same). The command:
(pretty-print ".....746...35......1.......7..6...2.....1............865.4...........8.3......1.6")
will give you the grid:

Code: Select all: +-------+-------+-------+ ! . . . ! . . 7 ! 4 6 . ! ! . . 3 ! 5 . . ! . . . ! ! . 1 . ! . . . ! . . . ! +-------+-------+-------+ ! 7 . . ! 6 . . ! . 2 . ! ! . . . ! . 1 . ! . . . ! ! . . . ! . . . ! . . 8 ! +-------+-------+-------+ ! 6 5 . ! 4 . . ! . . . ! ! . . . ! . . . ! 8 . 3 ! ! . . . ! . . . ! 1 . 6 ! +-------+-------+-------+

On this forum, you have to surround this grid by "[code ]" and "[/code ]" tags (without the spaces) in order to see it properly formatted.

However, the most useful starting point for most players is the resolution state after Singles (which SudoRules will also automatically provide at the start of resolution);

Code: Select all: +-------------------------+-------------------------+-------------------------+ ! 2589 289 2589 ! 12389 2389 7 ! 4 6 1259 ! ! 2489 246789 3 ! 5 24689 124689 ! 279 1789 1279 ! ! 24589 1 2456789 ! 2389 234689 234689 ! 23579 35789 2579 ! +-------------------------+-------------------------+-------------------------+ ! 7 3489 14589 ! 6 34589 34589 ! 359 2 1459 ! ! 234589 234689 245689 ! 23789 1 234589 ! 35679 34579 4579 ! ! 123459 23469 124569 ! 2379 234579 23459 ! 35679 134579 8 ! +-------------------------+-------------------------+-------------------------+ ! 6 5 12789 ! 4 23789 12389 ! 279 79 279 ! ! 1249 2479 12479 ! 1279 25679 12569 ! 8 4579 3 ! ! 23489 234789 24789 ! 23789 235789 23589 ! 1 4579 6 ! +-------------------------+-------------------------+-------------------------+

Now, for the solution. Some cleaning with whips[1]:

Code: Select all: whip[1]: r7n3{c6 .} ==> r9c6 ≠ 3, r9c4 ≠ 3, r9c5 ≠ 3 whip[1]: c9n4{r5 .} ==> r6c8 ≠ 4, r5c8 ≠ 4 whip[1]: r1n3{c5 .} ==> r3c6 ≠ 3, r3c4 ≠ 3, r3c5 ≠ 3 whip[1]: b9n5{r9c8 .} ==> r6c8 ≠ 5, r3c8 ≠ 5, r5c8 ≠ 5 whip[1]: b9n2{r7c9 .} ==> r7c6 ≠ 2, r7c3 ≠ 2, r7c5 ≠ 2

leads to the following resolution state:

Code: Select all: +-------------------------+-------------------------+-------------------------+ ! 2589 289 2589 ! 12389 2389 7 ! 4 6 1259 ! ! 2489 246789 3 ! 5 24689 124689 ! 279 1789 1279 ! ! 24589 1 2456789 ! 289 24689 24689 ! 23579 3789 2579 ! +-------------------------+-------------------------+-------------------------+ ! 7 3489 14589 ! 6 34589 34589 ! 359 2 1459 ! ! 234589 234689 245689 ! 23789 1 234589 ! 35679 379 4579 ! ! 123459 23469 124569 ! 2379 234579 23459 ! 35679 1379 8 ! +-------------------------+-------------------------+-------------------------+ ! 6 5 1789 ! 4 3789 1389 ! 279 79 279 ! ! 1249 2479 12479 ! 1279 25679 12569 ! 8 4579 3 ! ! 23489 234789 24789 ! 2789 25789 2589 ! 1 4579 6 ! +-------------------------+-------------------------+-------------------------+

from which three Subsets give the solution:

Code: Select all: hidden-pairs-in-a-column: c8{n4 n5}{r8 r9} ==> r9c8 ≠ 9, r9c8 ≠ 7, r8c8 ≠ 9, r8c8 ≠ 7 whip[1]: b9n7{r7c9 .} ==> r7c3 ≠ 7, r7c5 ≠ 7 whip[1]: b9n9{r7c9 .} ==> r7c3 ≠ 9, r7c5 ≠ 9, r7c6 ≠ 9 hidden-pairs-in-a-block: b1{n6 n7}{r2c2 r3c3} ==> r3c3 ≠ 9, r3c3 ≠ 8, r3c3 ≠ 5, r3c3 ≠ 4, r3c3 ≠ 2, r2c2 ≠ 9, r2c2 ≠ 8, r2c2 ≠ 4, r2c2 ≠ 2 whip[1]: b1n4{r3c1 .} ==> r5c1 ≠ 4, r6c1 ≠ 4, r8c1 ≠ 4, r9c1 ≠ 4 finned-swordfish-in-columns: n1{c1 c8 c4}{r8 r6 r2} ==> r2c6 ≠ 1 stte

(This is basically the same solution as pjb and RSW.)

by **Leren** » Sun Apr 18, 2021 6:57 am

Another reason I prefer . line format instead of 0 line format is that I use Excel a lot. If I'm not careful and just paste a 0 formatted line puzzle into a cell, Excel may recognise it as an 81 digit integer, truncate it to 15 decimal places and you end up with 7.46000350000001E+75 instead of the puzzle. I know there are simple ways around this, but you don't have to be careful if you use . format. Well, I've had my gripe for today, I feel better now

. Leren

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