Puzzles with more than one solution

Is that one you got on rated puzzles?

Yes.

Did you keep the link? I didn't see it in your last 25.

After Rad3 there is Kxc4 and no checkmate

That's right. That's effing right. Thanks.

Why chess is so incomprehensible while so simple and open? It's so obvious when someone points at something but until that it remians a mystery while every effing thing is in front of us on the board openly. Like the whole game is in the head. Humans are dumb people. Especially some specific ones like this. But generally depends on experience I guess. From now on I take that every rated puzzle has one solution.

But how is chess.com rated puzzle database built? Are there puzzle's in it that have multiple solutions or we can trust that if we don't see one best solution than we need to keep looking for one? Can we say and rely on that 100%? Is there an official statement about this?

Also, Is this a rated puzzle?