ronk wrote:I believe the "direct" means "immediate" and "easy", not just immediate. After all, the rating is quite low. For your example, in addition to locked candidates (4)b9\c9, one has to consider c7 as well. I don't think that is "easy" enough.
However, if there were already a placement in r4c7, then ...
thanks,
ronk, that's a good suggestion --
example
B (
same as example A plus 2 more known cells r2c9 = r4c7 = 5 )
- Code: Select all
1 9 8 | 5 6 3 | 4 7 2
. 4 2 | 9 . 8 | . . 5
. . . | 4 . 2 | . 9 8
-------+-------+------
2 3 9 | 7 8 6 | 5 . .
8 . . | . . . | 2 . 9
. . . | 2 . 9 | 8 . 7
-------+-------+------
4 2 . | 8 . . | 9 5 6
6 8 . | . 9 . | . 2 .
9 . . | 6 2 . | . 8 .
the 4 for b9 is in c9, immediately creating a "hidden single" 4 in
r4 -- the "hidden single" is created in a line --
not in a box -- and
SuDoku Explainer considers it "
Pointing" -- failing to recognize it as "
Direct Pointing" !!
example
C (
same as example A plus 2 more known cells r2c7 = 6, r4c8 = 4 )
- Code: Select all
1 9 8 | 5 6 3 | 4 7 2
. 4 2 | 9 . 8 | 6 . .
. . . | 4 . 2 | . 9 8
-------+-------+------
2 3 9 | 7 8 6 | . 4 .
8 . . | . . . | 2 . 9
. . . | 2 . 9 | 8 . 7
-------+-------+------
4 2 . | 8 . . | 9 5 6
6 8 . | . 9 . | . 2 .
9 . . | 6 2 . | . 8 .
the 1 for r4 is in b6, immediately creating a "hidden single" 1 in
c8 -- which in my view qualifies as "
Direct Claiming" -- but
SuDoku Explainer considers it "
Claiming" -- failing to recognize it as "
Direct Claiming" !!
i'd say it's just one bug
which recognizes "Direct Pointing" and "Direct Claiming" only when the immediate "hidden single" is created in a box,
failing to recognize it when it is created in a line.