Hi! I found an interesting game where Boris Gelfand won by interesting positional d-pawn sacrifice. The game took place in Spain, 2006. Gelfand played against Sergei Tiviakov.
They chase the Hubner Variation in Nimzo-Indian Defence. The key problem in middle game after this opening is often white d-pawn. In this game the key problem was black's extra d-pawn.
I'm sure, it wasn't the best game in Tiviakov's career. Thanks of it the Gelfand's idea of sacrifice pawn on d6 is clear, completly and consequently made.