– I understand that the 6 in cell F9 means there can not be a 6 in cells F4, F5, or F6.
– I understand that the 6 in cell H4 means there can not be a 6 in cells D4 or E4 (or the above-mentioned F4).
– which leaves, in my mind, the possibility that the 6 could exist in cells D5, D6, or E6 - but the author claims that the 6 can only go in cell E6 - period, end of story.
Is there some “trick” that I’m missing that eliminates cells D5 and D6 as being a possibility for the 6, in that center 3x3 box?
thanks, ekedolphin (I’m assuming your comment was sincere) - I’ve always had a knack for the “logic puzzles” (i.e. “the person seated to the left of the girl with the dress that wasn’t green took either the car or the trolley to the supermarket”) - and now I’m starting to see how applying that same sort of… well, logic… is necessary to filling these Sudoku things out.
I haven’t played Sudoku in ages - I really should start getting back into the gist of it
Anyhow, I don’t know if this has been answered or not (only just found the thread and I don’t log on that often), but he’s looking at row E only.
The 6 in F9 means that there can’t be a 6 in E8.
The 6 in H4 means that there can’t be a 6 in E4.
The 6 in G2 means that there can’t be a 6 in E2. The only vacant square left is E6.
This then helps locate the 6 in the next 3x3 box, because F1, F2 and F3 can’t be 6 (because of the 6 in F9) and E2 can’t be 6 because we have just found a 6 in the E row. This leaves the 6 to be in D3.