## Is this puzzle solvable?

Post the puzzle or solving technique that's causing you trouble and someone will help

### Is this puzzle solvable?

This is an expert level puzzle from an iPhone app, and I have double checked that all the small numbers are correct. This is the 3rd or 4th puzzle where i have put in all the small numbers and looked at it for about 20 minutes without finding anything. I've concluded that these puzzles are just computer generated and some of them are impossible, is there anything I'm missing to solve this?

Here is the link if the picture didn't work

This is my first time posting here so idk if used the image tags right
Audeoninja

Posts: 1
Joined: 17 June 2013

### Re: Is this puzzle solvable?

It is certainly solvable, though it appear to require chains. The next move I see, a type 2 unique rectangle, isn't too bad however. After that it gets a little more complex.

13.69.8546..5.8319589431267.5.3.91...9..1.53.3.1..5.9.218956..34657839219731..685

JasonLion
2017 Supporter

Posts: 640
Joined: 25 October 2007
Location: Silver Spring, MD, USA

### Re: Is this puzzle solvable?

It can be done with two bivalue-chains / AICs / Nice Loops (whichever name you give them)

biv-chain[3]: r6n6{c5 c9} - r5n6{c9 c3} - r5n4{c3 c6} ==> r6c5 <> 4
biv-chain[3]: r5n7{c1 c6} - b5n4{r5c6 r4c5} - r4c8{n4 n7} ==> r4c1 <> 7
Singles to the end
denis_berthier
2010 Supporter

Posts: 1261
Joined: 19 June 2007
Location: Paris

### Re: Is this puzzle solvable?

Code: Select all
` *--------------------------------------------------* | 1    3    27   | 6    9    27   | 8    5    4    | | 6    24   247  | 5    27   8    | 3    1    9    | | 5    8    9    | 4    3    1    | 2    6    7    | |----------------+----------------+----------------| |b78   5   b246  | 3   b467  9    | 1   b47   268  | |c78   9    26-4 | 28   1   c47   | 5    3    268  | | 3   a24   1    | 28   67-4 5    | 47   9    268  | |----------------+----------------+----------------| | 2    1    8    | 9    5    6    | 47   47   3    | | 4    6    5    | 7    8    3    | 9    2    1    | | 9    7    3    | 1    24   24   | 6    8    5    | *--------------------------------------------------*(4=2)r6c2-(2=8)r4c1358-(8=4)r5c16 => -4r5c3,r6c5; ste`
dan

ArkieTech

Posts: 3008
Joined: 29 May 2006
Location: NW Arkansas USA

### Re: Is this puzzle solvable?

Code: Select all
`1      3     e27     | 6      9     d27     | 8      5      4      6      4-2    247    | 5      27     8      | 3      1      9      5      8      9      | 4      3      1      | 2      6      7      ---------------------+----------------------+---------------------78     5      46-2   | 3      467    9      | 1      47     268    78     9     b46-2   | 28     1     c47     | 5      3      268    3     a24     1      | 28     467    5      | 47     9      268    ---------------------+----------------------+---------------------2      1      8      | 9      5      6      | 47     47     3      4      6      5      | 7      8      3      | 9      2      1      9      7      3      | 1      24     24     | 6      8      5      `

(2=4) r6c2 - r5c3 = (4-7) r5c6 = r1c6 - (7=2) r1c3 => -2 r2c2, r45c3
Phil
pjb
2014 Supporter

Posts: 2025
Joined: 11 September 2011
Location: Sydney, Australia