You can actually promote a pawn to any other piece as well (rook, bishop, knight, etc.), this is known as underpromotion. It's mostly a "why would you ever do that?" thing, though.
There are some situations where promoting to a Queen would result in a stalemate
Or to humiliate your opponent
Or possibly promoting to knight would give you checkmate where queen wouldnβt.
You can actually promote a pawn to any other piece as well (rook, bishop, knight, etc.), this is known as underpromotion. It's mostly a "why would you ever do that?" thing, though.
There are some situations where promoting to a Queen would result in a stalemate
Or to humiliate your opponent
Or possibly promoting to knight would give you checkmate where queen wouldnβt.
That's why they said "at most"