Underpromotion checkmate!

It's more artistic if underpromotion results in mate or avoids a stalemate. The Everything Chess Basics Book gives an example:

How do you even make those interactive chess puzzles?
I don't know if the mobile app even has the required controls. You probably need to use a real internet browser to access the buttons.

Saaveda!
What does that mean?
That's the name of that particular class of underpromotion problems.

Saaveda!
What does that mean?
That's the name of that particular class of underpromotion problems.
oh