This book contains 100 chess puzzles and their solutions, all of which are either fork, pin, or skewer tactics. The puzzles are intended for players of intermediate level. If you attack two of the opponent's pieces at the same time by using one piece, this is called a fork. When a defensive piece is stuck in a pin, it can't move without exposing a more valuable defending piece on the opposite side to assault. A skewer is an attack upon two pieces in a line and is similar to a pin.