dailysudoku.com

David Bryant · Joined: 29 Jul 2005 Posts: 559 Location: Denver, Colorado

This puzzle isn't nearly as hard as the "zen" sudoku I posted here yesterday, but it's still plenty tough. I found two different "5-star constellations" before I was able to solve it.

keith · Posted: Thu Mar 09, 2006 10:27 pm Post subject: Color me again!

David,

I found that early on there is a coloring on <7> which excludes that value from R9C3. This is a big help. Then, the puzzle can be solved via an X-wing on <3> (which also appears early), and the last step is an XY-wing on <9>. (After that, all moves are forced.)

Keith

someone_somewhere · Joined: 07 Aug 2005 Posts: 275 Location: Munich

Hi,
Just tried this one, in order to check that I am still alive ...

I foud for digit 3 a X-Wing on Column in: r2c2 r2c6 r5c2 r5c6
so I could eliminate it from: r3c2, r3c6, r4c2, r4c6, r9c6
and so 3 is in r9c4 as Unique Horizontal.

Now I excluded 6 from r4c3, because it would otherwise force a 6 in r9c1 and r9c6.

Followed by 9 not in r3c5 because of an XY-wing (that I leave to you to find) and by 9 not in r4c6 because of an other similar XY-wing.

Finally, I excluded 1 from r6c2, because it would give a contradiction on row with r9c1 and r9c7 for digit 1.

P.S. galaxies behind the "zen" one !!!

see u,