I'm gonna go with
The latter depends on the following characteristics of the move:
there are 8 different squares to block
any square you can reach in 1 move is impossible to reach in 2 moves
if you can reach a square in 1 move, there are several ways to reach it in 3 moves.
There are even some games like this, such as Hodgeson v Agdestein, London 1986. This example is in Martin Weteschnik's wonderful book Understanding Chess Tactics.
There's some clever tactics going on, but this is the last few moves of the game which ended in this way: