The Worst Possible Chess Move

Bad, even very bad chess moves are nothing out of the ordinary. Every single player will have had their fair share of stupid blunders like hanging a queen in an otherwise completely winning position. But it is pretty rare to see examples of the worst possible type of blunder:

Lets say that a chess move is (truly) atrocious if

• it forces the opponent to give checkmate the following move and
• every other legal move from the same position would give checkmate instead.

For example:

In this position, White has exactly two legal moves - Bxc6# (which is checkmate) and Qb7+???, which forces Black to respond with Qxb7#, checkmating White. So, the second option would be an example of a (truly) atrocious move.

Now, in this instance, there was only a single alternative move that White could have played. But clearly, a (truly) atrocious move grows all the more impressive the larger its set of alternatives is. So this is your challenge:

Try to find a legal chess position that admits a (truly) atrocious move with the most alternatives!

To kick things off, here is my (nonoptimal) benchmark of a (truly) atrocious move with 21 alternatives (White to move):

Can you beat that? I'm looking forward to your attempts :^)