Red Ed wrote:While I'm here, an update on the minimum unattainable number of solutions. Having given up on the 3x3 case, I looked at 3x2 and 4x2. The answer for 3x2 appears to be just over 1000: I'm stuck at 1019 at the moment (any takers?).

For these puzzles with around 1000 solutions, what is the range of numbers of clues?

What is the minimum number of clues for 3x2 sudoku?