basic explanation

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

basic explanation

Postby nadav3 » Sat Aug 31, 2013 10:58 pm

Hi
I've been trying to figure out what is the next move here, I know it's probably basic, but couldn't figure it out.
help?
thank you :)
Attachments
sud-no.jpg
sud-no.jpg (98.86 KiB) Viewed 563 times
nadav3
 
Posts: 6
Joined: 12 August 2013

Re: basic explanation

Postby nadav3 » Sun Sep 01, 2013 1:15 am

ok, just read about simple coloring, that explained it.
http://www.thonky.com/sudoku/simple-coloring/
nadav3
 
Posts: 6
Joined: 12 August 2013

Re: basic explanation

Postby JasonLion » Sun Sep 01, 2013 11:01 am

This position can be easily solved using a BUG+1.
User avatar
JasonLion
2017 Supporter
 
Posts: 624
Joined: 25 October 2007
Location: Silver Spring, MD, USA

Re: basic explanation

Postby starstories » Tue Jul 29, 2014 6:26 am

thanks for explaining in a simple manner.
starstories
 
Posts: 3
Joined: 17 June 2014

Re: basic explanation

Postby pjb » Wed Jul 30, 2014 5:47 am

if BUG technique is too esoteric, a little XY chain suffices:

(5=4)r5c1 - (4=1)r5c9 - (1=4)r6c8 - (4=1)r3c8 - (1=5)r3c5 => r3c1 <> 5

Which translates as:
if the 5 at r5c1 is true, then the 5 at r3c1is false
if the 5 at r5c1 is false, then the 5 at r3c5 is true, therefore the 5 at r3c1 is false
either way, the 5 at r3c1 must be false and can be removed.

Phil
pjb
2014 Supporter
 
Posts: 1716
Joined: 11 September 2011
Location: Sydney, Australia


Return to Help with puzzles and solving techniques