Rat Defense Pin Chess Puzzles

A rat defense pin is a pin that appears in the Rat Defense opening family, usually when Black develops in a flexible, hypermodern way and a piece gets tied to a more valuable target behind it. The defining feature is that the pin arises from the opening structure itself, often after an early ...b6, ...Bb7, or a central tension that lets one side line up a bishop or queen against a knight or bishop on the same file, rank, or diagonal.