[rpadovani]

Why?

If I have a complete grid, I can remove the top left number, and that's a puzzle. Or, I can remove the bottom right number, and that's another puzzle.

So, one unique grid can be the solution to multiple puzzles.

[Wowfunhappy]

> Why?

Because we said so earlier in this thread.

>> If you interpret "unique" to mean that two puzzles that lead to the same solution count as one

[rpadovani]

Yap, and that has been refuted:

> No, in Sudoku, the constraint of a "unique solution" is that a valid puzzle (i.e. an incomplete grid) must only have one correct way of being filled in without violating the rules.

My answer is to the answer to the above comment:

> Then the maximum number of solveable puzzles must be the maximum number of unique grids