Pawn Sacrifice

This is the definition of pawn sacrifice:
Pawn sacrifice means we have to sacrifice our pawn by attacking two pieces at once.
After we are done we have to gain any piece by giving pawn/knight fork/double attack with bishop/queen/rook.
Later, you have to either :

1. gain a piece or a material
2. checkmate
3. promote your pawn

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this is link for pawn fork and knight fork study