By the way, have you already checked the last post about the zwischenzug ?
The idea of removing the defender is simple: an important piece or square is defended by a piece: the defender.
Removing the defender gives you the ability to capture the important piece or occupy the important square.
This post is inspired from the corresponding Chess Trainer lesson.
Let's start with this example:
This Rook exchange eliminates the defender of the b6-Knight
Now that Rooks have been exchanged, the Knight can be captured. As simple as that :)
Check your understanding of that concept in the next puzzle:
Did you notice that the f4-Rook was protected only by the g5-pawn ?
If there was no check, Black could have captured the Rook in f1, but unfortunately, check first.
Winning one full Rook
The last example looks more like a real game. Find the winning move:
Similar to the first example: the reason why this queen exchange is winning is that it removes the c4 Knight's protection
Capturing the Knight and winning the game of course.
For more examples on removing the defender, I suggest you to have a look at this nice post from the Tactics Time blog which contains a couple of additional examples.
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