Friday 13 May 2011

Sudoku - Locked Puzzle (Part 2)

At this point, the puzzle is jammed …


A
B
C
D
E
F
G
H
I
1
7




6
1
8
9
2


6



4
7
2
3
1



9

6


4
6


8
7
1

4

5


1
4
6
2



6

7
4
9
5
3

6
1
7

6
9

3



4
8
4
1






6
9

5
7
6







13     I5 = 7 C
… And the puzzle is jammed again …

14     I9 = 8 C
… And can you believe it? After being jammed twice, it is now locked!


A
B
C
D
E
F
G
H
I
1
7




6
1
8
9
2


6



4
7
2
3
1



9

6


4
6


8
7
1

4

5


1
4
6
2


7
6

7
4
9
5
3

6
1
7

6
9

3



4
8
4
1






6
9

5
7
6




8

There is a full house in column A, because cells A6 and A7 may only house the digits 2 and 8. Therefore, the digits 2 and 8 can be eliminated from the other cells in the column (A2, A5 and A9). Consequently, 3 is the only possible digit in A9.

15     A67 : 28 N
16     A9 / 2  C
17     A2 / 8  C
18     A5 / 8  C
19     A9 = 3 N

… And yet locked again!  (Click here for continuation - Part 3)


A
B
C
D
E
F
G
H
I
1
7




6
1
8
9
2


6



4
7
2
3
1



9

6


4
6


8
7
1

4

5


1
4
6
2


7
6
28
7
4
9
5
3

6
1
7
28
6
9

3



4
8
4
1






6
9
3
5
7
6




8

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