(Sterten) writes:

I'm looking for a
a chessgame played in an international world-champion level competition,
in which a black pawn, protected by a knight and a rook approaches
the queening square, and white concedes.

This doesn't fit the description exactly, but there was a game
attributed to two Spanish players Ortueta and Sanz that involved a sacrifice
leading to promotion of a Black pawn. The Tim Krabbe web site has a long
article about it.