dailysudoku.com

[hughwill]

Now, I've had this before where a 'VH' fell out using basics
only to find that I'd put in a 'lucky guess' number which had
'solved' the puzzle. But today I did this twice, and both times
it came out with basics.

Two 'lucky guesses' or a fault in the grading system....?

[dizzy dave]

The basics solved it for me as well. It might be that the grading system upped the level based on how few cells were given, not just the solving techniques.

[George Woods]

Having done it twice I checked with draw play. The elementary 6 in Box 8 as a 1st move makes it change from v hard to hard. But as a check that it was simply a transcription error I tried 2 other 1st moves neithe or both of which left it as v Hard !!!!!!!!!

[Marty R.]

I also did it twice with basics. It's not the first time and probably won't be the last.

[Pat]