Counter-pins are tactics where you use a pin against a pin. If one player does a pin, such as a Bishop pinning an enemy Queen to the King, it looks like the Queen is won. But sometimes an enemy bishop can itself counter-pin the attacking bishop, forcing an exchange and saving the Queen. There are also counter-pins possible against rook pins and queen pins. They are much less common than regular pins, but watch out for these tricky escapes!
Diagram: Counter-Pin Saves the White Queen!
Diagram: Counter-Pin Saves the Black Rook
Related Chess Tactics
Read more about these related chess tactics and strategies: