View previous topic :: View next topic |
Author |
Message |
ZenDad
Joined: 17 Nov 2005 Posts: 1
|
Posted: Thu Nov 17, 2005 10:26 pm Post subject: Need Help |
|
|
I?m having trouble with this puzzle. Tried all the tricks I know and I?m stuck. I could use brute force and create a branch. But is there a better way?
000 420 600
164 589 030
028 700 045
090 208 054
201 940 300
040 300 020
639 852 400
002 194 563
415 637 000
Thanks
________
home made vaporizer
Last edited by ZenDad on Tue Feb 01, 2011 9:39 pm; edited 1 time in total |
|
Back to top |
|
|
Louise56
Joined: 21 Sep 2005 Posts: 94 Location: El Cajon, California USA
|
Posted: Thu Nov 17, 2005 11:01 pm Post subject: |
|
|
Hello Zendad!
Your puzzle has a {5,8} hidden pair in r5c2 and r6c1. You can eliminate the other numbers from these two spaces. Now in row 5 you have 7's only in r5c8 and r5c9. You can eliminate 7's in the middle right 3x3 box in all the other spaces but r5c8 and r5c9.
Now you have a 1 by itself in r4c7, so r4c7 = 1. In row 7 there are only two 7's and they are in r7c8 and r7c9. In row 5 there are only two 7's and they are in r5c8 and r5c9. This makes a nice X pattern and you can see that in column 9 there must be a 7 in either r5c9 or r7c9. Likewise there must be a 7 in either r5c8 or r7c8. This means you can eliminate the 7 from r2c9 and now r2c9 = 2. Hopefully the rest will fall in place, but if not, write back. |
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|