I've been on holiday. I'm still on holiday. Think of this as a practice run for what's coming on the 17th.
000051000030000900000000000020300046700040010000900000105000000000800200004000000
+------------------+---------------------+------------------------+
| 9 4 27 | 267 5 1 | a3678 23678 2378 |
| 6 3 1 | 4 b278 78 | 9 a27 5 |
| 8 5 27 | 267 D39 39 | 1 267 4 |
+------------------+---------------------+------------------------+
| 5 2 9 | 3 1 B78 | A78 4 6 |
| 7 6 38 | 5 4 2 | 38 1 9 |
| 4 1 38 | 9 C78 6 | 5 2378 2378 |
+------------------+---------------------+------------------------+
| 1 789 5 | 27 c23679 39 | 4 c36789 378 |
| 3 79 6 | 8 D79 4 | 2 5 1 |
| 2 789 4 | 1 D3679 5 | z378-6 36789 378 |
+------------------+---------------------+------------------------+
+------------------+---------------------+------------------------+
| 9 4 27 | 267 5 1 |zx3678* x23678 x2378 |
| 6 3 1 | 4 b278 z78* | 9 b2-7 5 |
| 8 5 27 | 267 39 39 | 1 267 4 |
+------------------+---------------------+------------------------+
| 5 2 9 | 3 1 z78* | z78* 4 6 |
| 7 6 38 | 5 4 2 | 38 1 9 |
| 4 1 38 | 9 a78 6 | 5 A2378 w2378 |
+------------------+---------------------+------------------------+
| 1 789 5 | 27 23679 39 | 4 36789 378 |
| 3 79 6 | 8 79 4 | 2 5 1 |
| 2 789 4 | 1 3679 5 | y3678 36789 378 |
+------------------+---------------------+------------------------+
*---------------------------------------------------------------*
| 9 4 27 | 267 5 1 | a3678 23678 2378 |
| 6 3 1 | 4 278 d78 | 9 A2-7 5 |
| 8 5 27 | 267 39 39 | 1 A267 4 |
|----------------+---------------------+------------------------|
| 5 2 9 | 3 1 c78 | b78 4 6 |
| 7 6 38 | 5 4 2 |Ba38 1 9 |
| 4 1 38 | 9 78 6 | 5 Bd2378 2378 |
|----------------+---------------------+------------------------|
| 1 789 5 | 27 23679 39 | 4 36789 378 |
| 3 79 6 | 8 79 4 | 2 5 1 |
| 2 789 4 | 1 3679 5 | 3678 36789 378 |
*---------------------------------------------------------------*
9 4 27 267 5 1 3678 23678 2378
6 3 1 4 278 78 9 27 5
8 5 27 267 39 39 1 267 4
5 2 9 3 1 78 78 4 6
7 6 38 5 4 2 38 1 9
4 1 38 9 78 6 5 2378 2378
1 789 5 27 23679 39 4 36789 378
3 79 6 8 79 4 2 5 1
2 789 4 1 3679 5 3678 36789 378
7r2c8 => r3c8 <> 2,6,7
r2c8=7 - c6n7{r2 r4} - r6n7{c5 c9} - r6n2{c9 c8}
r2c8=7 - c6n7{r2 r4} - c7n7{r4 r9} - c7n6{r9 r1}
=> r2c8 <> 7
ste.