chess fork,pin and skewer

Skewer –

File:Chess skewer bishop.png - Wikipedia

Pin or skewer - Chess Forums

Skewer and Pin - Chess Tactics

Forks, Pins, and Skewers

Skewer in chess attacks two pieces, Lifestyles

100 “Skewer Tactic” Chess Puzzles for Intermediate Players (Rating 1200-1500): 100 real-life chess tactics puzzles to make you a better player (Chess Puzzles, Strategy and Tactics - Skewer Tactics): Puzzles, Mr Chess

Skewer, Chess Wiki

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Intermediate Tactics: 50 Chess Puzzles - Skewers by Dave Schloss