Millenium sudoku expert - Page 23

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Example 2 (simple)
4
5
6
85 2
H
1
62
4
4
2
3
2
9
8
9
6
1
4
9
7
7
0000 0031
7
13
The cells indicated by 0s cannot contain the “flashing”
number (in this case 4). Therefore the H cell is the only
place in this row where a 4 can be inserted.
Example 3 (advanced) after two presses on the HINT button.
5
5
1
8
5
3
5
3
2
4
8
2
2
0
0
2
1
8
9
6
6
6
6
6
6
14
4
9
9
7
7
7
86
6
6
3
3
2
2
7
i
h
g
f
e
d
c
b
a
A
B
C
D E
F
G
H
I
There must be a 2 at Ea or Ec, so there cannot be a 2
further up the same column (at Ef or Ei).
The next two displays follow on from this after another press on the HINT
button (the machine shows them alternating with each other). Apart from the 2,
the other three missing numbers in the E-column are: 1, 3 and 9.
5
5
1
8
5
3
5
3
0
4
8
2
2
9
9
2
1
8
9
6
6
6
6
6
6
14
4
9
9
7
7
7
86
6
6
3
3
0
2
7
i
h
g
f
e
d
c
b
a
AB CDE FGH I
5
5
1
8
5
3
5
3
0
4
8
2
2
3
3
2
1
8
9
6
6
6
6
6
6
14
4
9
9
7
7
7
86
6
6
3
3
0
2
7
i
h
g
f
e
d
c
b
a
A B C D E F G H I
These alternating displays
show that the only possible
numbers for Ef and Ei are 3
and 9. (We know that there
cannot be a 2 in either of
these cells, and there is
already a 1 in row i and
another 1 in row f.)
So there must be a 3 in one of these cells. The next press on HINT produces
the following display:
The H flashing with the 0s shows you that one
particular number has been eliminated as a
“candidate” for all the 0 cells and must therefore be in
the H cell. Which number do you think this is?
We know that there must be a 3 at Ef or Ei, so there
cannot be a 3 at Ea or Ec. Nor can there be a 3 at Db
or Fb, as it would conflict with the 3 at Hb. Therefore the H cell is the only
possible cell in this block for a 3.
5
5
1
8
5
3
5
3
0
04
8
2
2
2
1
8
9
6
6
6
6
6
6
14
4
9
9
7
7
7
86
6
6
3
3
0
0
H
2
7
i
h
g
f
e
d
c
b
a
AB
C
D E
F
G H
I