Naked/Hidden Singles only:

- Code: Select all
+-----------+-----------+-----------+
| 7 6 | | 1 |
| | | 5 8 |
| 2 | 4 | |
+-----------+-----------+-----------+-----------+-----------+
| 5 | 9 1 | | 8 | 2 6 |
| 7 | | | | |
| | | | 5 | 9 7 |
+-----------+-----------+-----------+-----------+-----------+-----------+
| 9 6 | 4 | | | | 1 |
| | | | | | 9 |
| 7 | 8 2 | | | | 6 |
+-----------+-----------+-----------+-----------+-----------+-----------+
| 2 9 1 | | | | 8 | 4 6 |
| 7 4 | | | | 1 | |
| 8 | | | | | 7 |
+-----------+-----------+-----------+-----------+-----------+-----------+
| | 1 8 | | | 7 |
| 5 | | | 6 4 1 | |
| 6 | 4 | | 7 2 | |
+-----------+-----------+-----------+-----------+-----------+
| 4 9 | 5 | 3 6 |
| | | 4 1 |
| 8 | 3 7 | |
+-----------+-----------+-----------+
#4/ /B10/H4/K16/E22
..59.1....7................96.4................78.2...291......7.4........8......
7.6....1........58..2..4......8...26............5..9.7...........................
........1......9........6.....8..46.....1..........7..........7...641......7.2...
..............................18....5.........6..4....49.5..3.6.......41..837....
The next one is 180° symmetric.
Basics methods needed:
- Code: Select all
+-----------+-----------+-----------+
| 3 | 8 6 | 7 |
| | | 4 |
| 4 7 | 1 | 5 |
+-----------+-----------+-----------+-----------+-----------+
| 8 | 4 | | 8 6 | 7 |
| | | | | |
| 4 | 1 | | 5 | 1 9 |
+-----------+-----------+-----------+-----------+-----------+-----------+
| 5 | 8 | | | | 7 |
| 7 1 | 6 | | | | |
| 8 2 | 3 | | | | 1 |
+-----------+-----------+-----------+-----------+-----------+-----------+
| 9 | | | | 8 | 3 1 |
| | | | | 6 | 4 5 |
| 2 | | | | 9 | 7 |
+-----------+-----------+-----------+-----------+-----------+-----------+
| 8 4 | 2 | | 9 | 8 |
| | | | | |
| 9 | 3 7 | | 5 | 1 |
+-----------+-----------+-----------+-----------+-----------+
| 8 | 3 | 2 4 |
| 5 | | |
| 3 | 6 1 | 9 |
+-----------+-----------+-----------+
#4//B10/H4/K16/E22
8..4..............4....1.....58.....7.1..6....82.3......9................2.......
.3.86.7..........4.471...5.....86..7.............5..19...........................
.......7................1......8.31....6..4.5.....97.....9....8..............5..1
...........................84..2.............9..37.....8...324.5..........3.61.9.

