@demonolith
Underpromotion to make the opponent think whether it's even a good idea to capture the piece can be a trick to make him loose time, but if the correct move is to not take the underpromoted piece, you should have promoted to a Queen, right, because it seems your opponent will be better anyway. If the correct move is to take the underpromoted piece, it doesn't matter at all and you could have promoted to a queen.
That said, some funny examples here:
timkr.home.xs4all.nl/chess2/minor.htm
The Amelung-Erler position (K+pawn, K+pawn) probably comes closest to what you have in mind. - but still involves a stalemate.
Underpromotion to make the opponent think whether it's even a good idea to capture the piece can be a trick to make him loose time, but if the correct move is to not take the underpromoted piece, you should have promoted to a Queen, right, because it seems your opponent will be better anyway. If the correct move is to take the underpromoted piece, it doesn't matter at all and you could have promoted to a queen.
That said, some funny examples here:
timkr.home.xs4all.nl/chess2/minor.htm
The Amelung-Erler position (K+pawn, K+pawn) probably comes closest to what you have in mind. - but still involves a stalemate.