4 ms·
Order to fill in the board (1, 2, 3, ... 9, A, B, C, ... N): B C D O 2 1 X 3 G N 4 X M N H I 5 O F E F X O X L K J 6 A X 9 8 X 7 8 O Reasonin
by 1wd 12y ago
Order to fill in the board (1, 2, 3, ... 9, A, B, C, ... N):
B C D O 2 1
X 3 G N 4 X
M N H I 5 O
F E F X O X
L K J 6 A X
9 8 X 7 8 O
Reasoning:
1. finish column
2. avoid OOO in row
3. avoid OOO in row
4. avoid OOO in row
5. avoid OOO in column
6. don't duplicate column 6
7. avoid XXX in column
8. wrap XX on both sides
9. finish row
A. finish column
B. avoid OOO in column
C. avoid XXX in column
D. finish row
E. don't duplicate column 5
F. finish row
G. avoid OOO in column
H. avoid OOO in column
I. avoid XXX in row
J. finish column
K. avoid OOO in row
L. finish row
M. finish column
N. finish rows
- bumbledraven 12y agoNice work! Step 6 was the one that eluded me. Using that principle I've now been able to solve several boards that I previously thought required guessing.
- 1wd 12y agoYeah, finding step 6 took me much longer than any other step. (Followed by step E.)
- bumbledraven 12y agoDo you see a way to make progress on this one without guessing? O X - - X O X - - O - - - O X X O - - - O - - - O - X O X - X O - - O -