## help with expert sudoko puzzle

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

### help with expert sudoko puzzle

hello
I'm learning advanced techniques to solving sudoko puzzles.
I'm stuck with this one, I've tried anything I know (hidden singles, naked pairs, triples and quads, x-wing) and still cannot find the next move.
can someone enlighten me?
the pencil marks shown are after I narrowed down the options.
thank you
Attachments
soduko.jpg (90.62 KiB) Viewed 568 times

Posts: 6
Joined: 12 August 2013

### Re: help with expert sudoko puzzle

I see a locked candidate on 5 in row 6, and then singles to the end.

JasonLion
2017 Supporter

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

(5) b1\c2
solves the 5 for r6

Pat

Posts: 3652
Joined: 18 July 2005

### Re: help with expert sudoko puzzle

thanks a lot... don't know how I didn't see it...
Pat, what does this mean in words: (5) b1\c2 ?

Posts: 6
Joined: 12 August 2013

### Re: help with expert sudoko puzzle

Pat was pointing out a different locked candidate, digit 5 in block 1 which eliminates 5s in the rest of column 2, and also solves the puzzle with singles to the end.

JasonLion
2017 Supporter

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

### Re: help with expert sudoko puzzle

thanks, I don't understand how I missed that...

Posts: 6
Joined: 12 August 2013

1. box\line: (5) b1\c2 --> r6 5
2. line\box: (5) c3\b4 --> r6 5
3. line\box: (5) r6\b4 --> c3 5 [ path suggested by JasonLion ]

the symmetry between b and c
makes me reluctant to prefer one over the other,
so how about going to a fish of order 2:

4. X-wing: (5) r6c3\b44 --> b4 5
[ one of those bizzare beasts with same house twice in the cover ]

Pat

Posts: 3652
Joined: 18 July 2005

Return to Help with puzzles and solving techniques