isnt only home the same as the first assistant??
No, it isn't.
Only Home triggers when any digit is the last one within a row, column or box.
So for example, if a row had three empty cell with the following possible values:
- 1, 3
- 1, 3, 4
- 1, 3
The assistant would fill in the 4, because that's the only place (hence only home) it could fit inside of the row.
Last Digit triggers when any digit is the only one that can solve a cell.
For example:
- 1, 3, 4
- 4
- 1, 3, 4
The assistant would fill in the 4, because in that cell, only that number can go there.
Not that any of this makes any difference for the game, but I hope this clarifies it.