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Definition
In clearance sacrifice you sacrifice a more valuable piece in order to clear a critical square.
Be careful. The final result of the exchange should be that you gain more than you lose.
In the example on this page if the white knight were in the white queen's position it would fork the black king and the black queen. White decides to sacrifice the white queen to capture the black knight, making way for the knight to fork. The end result is that while white lost a queen white captured a queen and a knight!
Example