10 Level of tactics : Skewer

Introduction : The skewer is a type of tactic in which a powerful piece is forced to move and a a piece is destroyed  example a queen is in the back of a king in the same diagonal and a rook attacks a king and a queen is destroyed this is example

here the rook screws king and queen in which king is forced to move and rook takes queen
 

ELO - 1 - 0-500

ELO - 2 - 500-1000

ELO - 3 - 1000-1500

These all are puzzles you can solve