Undermining
Undermining (also known as removal of the guard, or removing the defender) occurs when a defensive piece is captured, leaving one of the opponent's pieces undefended or under-defended.
The opponent has to choose between recapturing or saving the undefended piece.
Time to practice! White to move and win.
Answers in the next section
Answers
Bxb5
RxBd7
d4xe5
Nb6