dailysudoku.com

nataraj · Posted: Tue Jul 22, 2008 6:39 am Post subject: July 22 VH

This time, the "very hard" point comes rather early, while there are still quite a few unsolved cells around, so some searching is required.

xy-wing 29-24-49 row 2 col 8, it takes out 9 in r5c5.

Also, for those who like to exhaust all basic techniques before going "vh", there is a naked quint(?) / hidden pair in box 4 (not needed for the solution).

I also found an xyz-wing but it did not do very much (249 col 4/box 2)

LloydB · Joined: 09 Jul 2007 Posts: 21 Location: Skagit Co., WA USA

I also found the xyz wing but it may not have been needed as I later found a 249 xy wing which didn't seem to depend on it. That cracked the puzzle.

tlanglet · Posted: Tue Jul 22, 2008 12:25 pm Post subject:

I initially found the <249> xy-wing. Then as I was cleaning up, I saw a Type 1 UR on <46> which I took but was apparently not needed to complete the puzzle.

Ted

tlanglet · Posted: Tue Jul 22, 2008 12:32 pm Post subject: Re: July 22 VH

cgordon · Joined: 04 May 2007 Posts: 769 Location: ontario, canada

I prefer ER’s and UR’s, but could only find the 249 xy wing. Seems this is all that is available at the VH stage.

Clement · Posted: Tue Jul 22, 2008 8:21 pm Post subject: Daily Sudoku: Tue 22 Jul-2008 VH

XY-Wing 249 Pivot {2,4}r2c8 with pincers 29 r2c5 and 49 r5c8 eliminating 9 in r5c5 solving the puzzle.

cgordon · Joined: 04 May 2007 Posts: 769 Location: ontario, canada

nataraj · Posted: Thu Jul 24, 2008 6:24 am Post subject:

quad, quint ... hm, it probably depends on one's point of view.
In box 4 there is a hidden pair/naked quint
In col 1 there is a hidden pair / naked quad.
When I first did it I missed the box/line elimination that took out a 7 in r7c1...

And, of course the xy wing is there already ...