Code: Select all
1 . .|. 8 .|. 2 .
9 . .|3 2 .|. . 6
. . .|9 . .|5 . .
-----+-----+-----
. . .|. . 4|. 1 .
5 9 .|. . .|. 3 4
. 2 .|6 . .|. . .
-----+-----+-----
. . 5|. . 9|. . .
2 . .|. 4 8|. . 3
. 8 .|. 3 .|. . 7
01: Digit 2 is a hidden single for R3C3 in multiple houses
02: Digit 3 is a hidden single for R1C7 in multiple houses
03: Digit 3 is a hidden single for R6C6 in multiple houses
04: Digit 4 is a hidden single for R1C4 in multiple houses
05: Digit 9 is both a naked and a hidden single for R1C9
06: Hidden single in column 3 for digit 3
07: Column 2 only has candidates for digit 1 in box 7
08: Column 5 only has candidates for digit 5 in box 5
09: Column 4 only has candidates for digit 5 in box 8
10: Column 8 only has candidates for digit 6 in box 9
11: Column 9 only has candidates for digit 5 in box 6
12: Naked Triple in column 5 for digits (1,6,7)
13: Hidden single in row 6 for digit 1
14: Digit 4 is a hidden single for R6C1 in multiple houses
15: Naked single for digit 6 in R9C1
16: Hidden single in box 8 for digit 6
17: Digit 6 is a hidden single for R8C8 in multiple houses
18: Digit 5 is a hidden single for R9C8 in multiple houses
19: Digit 5 is a hidden single for R8C4 in multiple houses
20: Hidden single in box 8 for digit 7
21: Hidden single in column 8 for digit 9
22: Digit 9 is a hidden single for R4C5 in multiple houses
23: Column 5 has one empty cell for the final digit 5
Step 23 is not a Full House - Column (4 points). Cells, R3C5 & R5C5 still have candidates 1, 7 in them. It is a Mixed Single (C5, B5 + Naked Single).
If I paste the Filled in puzzle as it stands after step 20:
Code: Select all
1 . .|4 8 .|3 2 9
9 . .|3 2 .|. . 6
. . 2|9 . .|5 . .
-----+-----+-----
. . 3|. . 4|. 1 .
5 9 .|. . .|. 3 4
4 2 1|6 . 3|. . .
-----+-----+-----
. . 5|7 6 9|. . .
2 . .|5 4 8|. 6 3
6 8 .|. 3 .|. 5 7
01: Hidden single in column 8 for digit 9
02: Digit 9 is a hidden single for R4C5 in multiple houses
03: Digit 5 is a hidden single for R6C5 in multiple houses
Or if I paste in the puzzle with Pencil Marks from step 20:
Code: Select all
.------------------.------------------.------------------.
| 1 567 67 | 4 8 567 | 3 2 9 |
| 9 457 478 | 3 2 157 | 1478 478 6 |
| 378 3467 2 | 9 17 167 | 5 478 18 |
:------------------+------------------+------------------:
| 78 67 3 | 28 59 4 | 26789 1 258 |
| 5 9 678 | 128 17 127 | 2678 3 4 |
| 4 2 1 | 6 59 3 | 789 789 58 |
:------------------+------------------+------------------:
| 3 134 5 | 7 6 9 | 1248 48 128 |
| 2 17 79 | 5 4 8 | 19 6 3 |
| 6 8 49 | 12 3 12 | 1249 5 7 |
'------------------'------------------'------------------'
01: Hidden single in column 8 for digit 9
02: Digit 9 is a hidden single for R4C5 in multiple houses
03: Digit 5 is both a naked and a hidden single for R6C5