The New Sudoku Players' Forum

[AnotherLife]

You have a right to express your opinion and post your solutions. That is all, JCO.

P.S. Собака лает, а караван идёт.

[Ngisa]

Please, try to solve this puzzle by human means. Don't be computer slaves!

Code: Select all

|..3|...|...|
|..6|7..|...|
|.8.|...|.45|
|---+---+---|
|..1|..4|..8|
|.6.|...|...|
|.94|.71|.2.|
|---+---+---|
|..7|..8|...|
|.4.|9..|35.|
|...|145|.7.|

..3........67......8.....45..1..4..8.6........94.71.2...7..8....4.9..35....145.7.


I never use and I have never used a computer to solve these puzzles, they are meant to challenge our brains

[AnotherLife]

I never use and I have never used a computer to solve these puzzles, they are meant to challenge our brains

Ok, I am very glad. Actually, you don't need to make excuses.

[denis_berthier]

.
This puzzle is # 3780 of my cig-000 collection.

Code: Select all

Resolution state after Singles and whips[1]:
   +-------------------+-------------------+-------------------+
   ! 12579 1257  3     ! 4     12589 269   ! 12679 1689  12679 !
   ! 4     125   6     ! 7     12589 29    ! 129   1389  1239  !
   ! 1279  8     29    ! 23    1239  2369  ! 12679 4     5     !
   +-------------------+-------------------+-------------------+
   ! 237   237   1     ! 2356  2369  4     ! 5679  369   8     !
   ! 2378  6     5     ! 238   239   239   ! 1479  139   13479 !
   ! 38    9     4     ! 3568  7     1     ! 56    2     36    !
   +-------------------+-------------------+-------------------+
   ! 12569 125   7     ! 236   236   8     ! 12469 169   12469 !
   ! 126   4     8     ! 9     26    7     ! 3     5     126   !
   ! 2369  23    29    ! 1     4     5     ! 8     7     269   !
   +-------------------+-------------------+-------------------+
175 candidates

Using the most standard rules, there are only 3 steps slightly harder.
hidden-pairs-in-a-column: c5{n5 n8}{r1 r2} ==> r2c5≠9, r2c5≠2, r2c5≠1, r1c5≠9, r1c5≠2, r1c5≠1
hidden-single-in-a-block ==> r3c5=1
whip[1]: c5n9{r5 .} ==> r5c6≠9
finned-x-wing-in-rows: n7{r3 r4}{c7 c1} ==> r5c1≠7
whip[1]: r5n7{c9 .} ==> r4c7≠7
hidden-pairs-in-a-block: b6{n4 n7}{r5c7 r5c9} ==> r5c9≠9, r5c9≠3, r5c9≠1, r5c7≠9, r5c7≠1
single ==> r5c8=1, r5c5=9
biv-chain[4]: r4n5{c4 c7} - r6c7{n5 n6} - r3n6{c7 c6} - b2n3{r3c6 r3c4} ==> r4c4≠3
z-chain[4]: b4n2{r5c1 r4c2} - c2n7{r4 r1} - r3c1{n7 n9} - r3c3{n9 .} ==> r1c1≠2
whip[4]: r6c7{n6 n5} - r4n5{c7 c4} - c4n6{r4 r7} - b9n6{r7c7 .} ==> r6c9≠6

The end is in S2: Show

singles ==> r6c9=3, r6c1=8, r5c4=8, r2c8=3, r1c8=8,r1c5=5, r2c5=8, r2c2=5, r7c1=5
whip[1]: r7n9{c9 .} ==> r9c9≠9
whip[1]: r2n1{c9 .} ==> r1c7≠1, r1c9≠1
finned-x-wing-in-columns: n6{c8 c5}{r4 r7} ==> r7c4≠6
whip[1]: b8n6{r8c5 .} ==> r4c5≠6
naked-pairs-in-a-block: b5{r4c5 r5c6}{n2 n3} ==> r4c4≠2
finned-x-wing-in-columns: n2{c4 c3}{r3 r7} ==> r7c2≠2
singles ==> r7c2=1, r1c1=1, r8c9=1, r2c7=1
whip[1]: b1n9{r3c3 .} ==> r3c6≠9, r3c7≠9
finned-x-wing-in-rows: n2{r8 r5}{c1 c5} ==> r4c5≠2
stte

No need to make any assumption of uniqueness or to use extra-long chains.

SER = 8.5 or W+4 don't make a puzzle a monster.

[totuan]

You have a right to express your opinion and post your solutions. That is all, JCO.

P.S. Собака лает, а караван идёт.

Wow, it is easy to translate from Russia to English by Google...
For what? What a sad!

[jco]

Hi totuan,

You have a right to express your opinion and post your solutions. That is all, JCO.

P.S. Собака лает, а караван идёт.

Wow, it is easy to translate from Russia to English by Google...
For what? What a sad!

Thanks for pointing that out. For me that is offensive. Reported.

Edit 1: Report removed.
Edit 2: report re-written and sent again.

[eleven]

si tacuisses ...