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  Topic: Vanhegan Fiendish 9/5
Johan

Replies: 13
Views: 12502

PostForum: Other puzzles   Posted: Sat Sep 06, 2008 10:26 pm   Subject: Vanhegan Fiendish 9/5
Another one step is the 23 UR* in R58C45, for avoiding the 23 DP either/or both R8C45=4, R8C4=8, which eliminates both <2>'s in R8C45 and <2> in R9C8.

R8C45=4 => R8C8=2(a)

R8C4=8 ...
  Topic: The Finned XY-Wing
Johan

Replies: 15
Views: 29441

PostForum: Solving techniques, and terminology   Posted: Wed Aug 06, 2008 12:53 am   Subject: A Finned XYZ-wing ??
This puzzle is from "Die Presse" Saturday 2nd of August and was posted by nataraj in the other puzzles forum, the puzzle can be solved with the advanced VH techniques.

Reading the latest ...
  Topic: August 3 VH
Johan

Replies: 6
Views: 9473

PostForum: Daily Sudoku puzzles   Posted: Sun Aug 03, 2008 10:25 pm   Subject: August 3 VH
I used the strong link on <6> for solving this one.

Some of the strong links in a grid can be very useful for finding a solution, especially when the strong link is surrounded with bi-value c ...
  Topic: LA Times/Freep - Aug 1, 2008
Johan

Replies: 4
Views: 5981

PostForum: Other puzzles   Posted: Fri Aug 01, 2008 12:56 pm   Subject: LA Times/Freep - Aug 1, 2008
I used the 24 UR* in R23C25, notice that the 24 UR contains an x-wing on <2>, so the <4>'s in R23C2 can be eliminated (otherwise we have a 24 DP), which

solves the puzzle.
+---------- ...
  Topic: July 9 VH
Johan

Replies: 20
Views: 27568

PostForum: Daily Sudoku puzzles   Posted: Wed Jul 09, 2008 4:16 pm   Subject: July 9 VH
I used the 26 UR* in R45C36 to solve this one, the digits marked + (= possible solutions to avoid a 26 DP) in the 26 UR pins <8> in R8C3.

R45C3=9 => R8C3=8

R4C6=8 => R8C6=9 => R8 ...
  Topic: July 5 VH
Johan

Replies: 10
Views: 12573

PostForum: Daily Sudoku puzzles   Posted: Sat Jul 05, 2008 10:13 pm   Subject: July 5 VH
Always like to find a killer solution, this one lies in Box 9.

There is an Empty Rectangle for digit <3> in Box 9, the ERI(Empty Rectangle Intersection) is in R7C9, it can see one of the stro ...
  Topic: June 27, VH
Johan

Replies: 10
Views: 12422

PostForum: Daily Sudoku puzzles   Posted: Fri Jun 27, 2008 8:59 am   Subject: June 27, VH
I used the strong link* on <2> in C1, which eliminates <1> in R1C5 collapsing the whole puzzle. Either R2C1=2 or R7C1=2.

R2C1=2 => R1C1=1(a)

R7C1=2 => R7C5=1(b)
+------------- ...
  Topic: I thought I was getting good, then ...
Johan

Replies: 6
Views: 7638

PostForum: Other puzzles   Posted: Thu Jun 26, 2008 10:54 am   Subject: I thought I was getting good, then ...
one step solution

Nice catch Norm !

These xy-chains maybe underestimated, but it solves this grid in one fell swoop. Nevertheless i like these chains, they can be a powerful tool to break the ...
  Topic: June 22, VH
Johan

Replies: 18
Views: 19093

PostForum: Daily Sudoku puzzles   Posted: Sun Jun 22, 2008 6:15 pm   Subject: June 22, VH
Johan, I used a second <45> Remote Pair(abcd) to shot the puzzle down.

Nice shot Ted
  Topic: June 22, VH
Johan

Replies: 18
Views: 19093

PostForum: Daily Sudoku puzzles   Posted: Sun Jun 22, 2008 12:56 pm   Subject: June 22, VH
I used the <45> remote pair(abcd) to eliminate <45> in R9C1.
+--------------------------+-------------------------+-------------------------+
| 1 8 345 | 7 36 ...
  Topic: LA Times / Freep - 13 June, 2008
Johan

Replies: 5
Views: 6524

PostForum: Other puzzles   Posted: Sat Jun 14, 2008 9:53 pm   Subject: LA Times / Freep - 13 June, 2008
Needed an UR and a 5-cell xy-chain to complete this one. The <46> UR* in R35C46 eliminates both <6>'s in R3C46 (x-wing on <4> in the 46 UR), then a 5-cell

xy-chain(ABCDE) with pi ...
  Topic: june 14 vh
Johan

Replies: 5
Views: 9081

PostForum: Daily Sudoku puzzles   Posted: Sat Jun 14, 2008 9:49 pm   Subject: june 14 vh
I used a Finned x-wing on <8>, either the Fin(F) is true in R7C3 or the x-wing* in R29C34, in both cases it deletes <8> in R9C1

+-------------------------+-------------------------+---- ...
  Topic: 10 June
Johan

Replies: 6
Views: 10074

PostForum: Daily Sudoku puzzles   Posted: Tue Jun 10, 2008 10:13 am   Subject: 10 June
Another UR solution is the 78 UR* in R48C13, which pins <5> in R5C2, all three digits marked (+) in the 78 UR are the possible solutions for avoiding the 78
deadly pattern, all three results i ...
  Topic: Do the June 4 Very Hard at the previous weekend!
Johan

Replies: 25
Views: 36534

PostForum: Daily Sudoku puzzles   Posted: Wed Jun 04, 2008 1:26 pm   Subject: Do the June 4 Very Hard at the previous weekend!
For those who like an UR solution, the digits marked (+) in the 29 UR* reveals two pincer cells for digit <9>, which eliminates <9> in R3C7 and R8C8

sweeping the grid. R8C89=5 or 6, ot ...
  Topic: LA Times / Freep - May 30, 2008
Johan

Replies: 4
Views: 8758

PostForum: Other puzzles   Posted: Sat May 31, 2008 4:55 pm   Subject: LA Times / Freep - May 30, 2008
The extra digits(+) in the 89 UR* in R46C25 are creating two pincer cells for digit <3> in R9C2(a) and R8C5(b), eliminating <3> in R9C46 and R8C2, collapsing the whole puzzle

+--------- ...
  Topic: May 30 VH
Johan

Replies: 16
Views: 22010

PostForum: Daily Sudoku puzzles   Posted: Fri May 30, 2008 7:30 am   Subject: May 30 VH
The 25 UR* in R46C19 pins <7> in R2C1, all three solutions for avoiding the possible 25 DP ends up with <7> in R2C1, which succumbs the puzzle.

#1 R46C1=9 => R1C1=4 => R2C1=7

# ...
  Topic: Another gsf (one step)
Johan

Replies: 5
Views: 7362

PostForum: Other puzzles   Posted: Mon May 26, 2008 2:38 pm   Subject: Another gsf (one step)
The 48 UR* in R34C23 deletes <1> in R2C9, solving the puzzle, either R3C2=7 or/both R4C3=9 for avoiding the 48DP

R3C2=+-------------------------+-------------------------+-------------------- ...
  Topic: May 21, 08 vh
Johan

Replies: 16
Views: 19042

PostForum: Daily Sudoku puzzles   Posted: Wed May 21, 2008 10:46 am   Subject: May 21, 08 vh
The <48> remote pair (abcd) was the crunching point for me, it deletes <4> and <8> in R9C8

+-------------------------+-------------------------+-------------------------+
| 6 ...
  Topic: VH May 19 - contains spoilers!
Johan

Replies: 16
Views: 21805

PostForum: Daily Sudoku puzzles   Posted: Mon May 19, 2008 10:30 am   Subject: VH May 19 - contains spoilers!
I used the 27 UR* in R79C28, which pins <5> in R7C3 collapsing the whole puzzle. Notice when R7C3=3, digit <1> must be in R7C8 otherwise we have a 27 Deadly Pattern in R79C28. But when R7C ...
  Topic: May 3 vh
Johan

Replies: 11
Views: 13765

PostForum: Daily Sudoku puzzles   Posted: Sat May 03, 2008 4:51 pm   Subject: May 3 vh
I used the 69 UR in R58C79, which eliminates both <6>'s in R58C7 (there is an x-wing on <9> in the 69 UR, placing <6> in either R5C7 or in R8C7 results in a 69 DP), then M-wing on th ...
 
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