This link has been bookmarked by 68 people . It was first bookmarked on 24 Apr 2006, by Pedro Timoteo.
-
05 Jun 16
-
17 Mar 14
-
05 Feb 13
-
21 Mar 12
-
04 Mar 12
-
24 Apr 10
-
21 Apr 10
-
10 Apr 10
-
07 Mar 10
-
27 Feb 10
-
24 Dec 09
-
10 May 09
-
11 Jan 09
-
20 Oct 08
-
21 Apr 08
-
20 Apr 08
-
24 Mar 08
-
02 Mar 08
-
08 Jan 08
-
30 Sep 07
-
28 Mar 07
-
Therefore, any cells which share a group with both these branches can safely have candidate 5 excluded (ie cells R1C6 & R9C5 as illustrated).
-
If four candidates are restricted to four cells in a given group, then all other candidates in those four cells can be excluded.
Hidden Quads are very rare, which is fortunate since they're almost impossible to spot even when you know they're there. -
If three candidates are restricted to three cells in a given group, then all other candidates in those three cells can be excluded.
In the example below, the candidates 3, 6 and 7 are found only in column four, six and seven. Therefore, all other candidates can be excluded from those three cells. -
If two cells in a group contain a pair of candidates (hidden amongst other candidates) that are not found in any other cells in that group, then other candidates in those two cells can be excluded safely.
-
A Naked Quad occurs when four cells in a group contain no candidates other that the same four candidates.
-
A Naked Triple occurs when three cells in a group contain no candidates other that the same three candidates. The cells which make up a Naked Triple don't have to contain every candidate of the triple. If these candidates are found in other cells in the group they can be excluded.
-
-
26 Feb 07
-
15 Feb 07
-
03 Nov 06
-
14 Oct 06
-
07 Aug 06
-
29 Jun 06
-
04 May 06
-
24 Apr 06
-
23 Apr 06
-
14 Apr 06
-
12 Apr 06
-
Fill in all blank cells making sure that each row, column and 3 by 3 box contains the numbers 1 to 9.
-
-
16 Dec 05
-
18 Sep 05
-
13 Sep 05
Page Comments
Would you like to comment?
Join Diigo for a free account, or sign in if you are already a member.