SKEWER

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TODAY THE TOPIC IS SKEWER 

as @green-emerald said

WHAT IS SKEWER??

Skewers, also called “x-ray attacks” are performed on a line with a queen, rook, or bishop. The more valuable piece on the line is attacked and when it moves aside, the piece behind it is lost.

THIS VIDEO WILL GIVE MORE INFORMATION TO YOU IN SKEWER.

THERE ARE TWO TYPES OF SKEWER

1) ABSOLUTE SKEWER 

2) RELATIVE SKEWER

ABSOLUTE SKEWER

In this diagram, with White to move, the white king is skewered by the black bishop. This is an absolute skewer, because the rules of chess compel White to get out of check (if possible). After White chooses one of the handful of legal moves available, Black will capture the white queen.

RELATIVE SKEWER

In this diagram, with Black to move, the black queen is skewered by White's bishop. To avoid capture of the queen, Black must move the queen, and on the next move, White can capture the rook. This is a relative skewer; Black is likely to move the queen, which is more valuable than the rook—but the choice is still available.

REGARDS 

@chessmastergm2020