Greetings!

Today's completely pointless question:

For the purpose of this discussion, a "trivial" sudoku is one whose initial configuration leaves at least one cell with a single candidate, and filling in all initial single candidate cells eliminates other candidates so that other single-candidate cells are left, repeating the process until the puzzle is solved.

What is the minimum number of initialized cells needed to create a trivial 3x3 sudoku?

RobR