Interference — sever the line between two defenders
A tactical sacrifice that blocks the communication between enemy pieces.
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What is Interference?
Interference (sometimes called occlusion) is a tactical motif that occurs when a piece is intentionally placed between two enemy pieces, severing their connection or line of sight. This is typically achieved by sacrificing a piece on a square where it interrupts the defensive path of a rook, bishop, or queen. The primary goal of interference is to cut off a defending piece from the square, piece, or line it is protecting. Once the line of communication is broken, the attacker can exploit the newly created vulnerability, often leading to material gain or a forced checkmate. Interference is closely related to the concept of a blockade, but while a blockade restricts movement, interference specifically targets lines of defense and coordination.
How It Works — Step by Step
Cutting the Communication
Black's rook on a8 defends the rook on f8 along the 8th rank. Be8! lands between them, severing the connection.
Diagonal Interference
Placing a piece on a square that interrupts a defensive diagonal breaks the defender's line of sight.
The Interference Sacrifice
Sacrificing a piece ON the interference square. The opponent must capture — and by capturing, their piece blocks its own ally.
Classic Example: Blocking the Rooks
A piece sacrifice between doubled rooks or queen-rook batteries shatters the coordination and wins immediately.
Interference in Your Openings
These openings frequently produce interference opportunities
Sicilian Defense
In complex variations of the Sicilian, such as the Najdorf or Dragon, interference tactics often arise in the middlegame when both sides are launching attacks. Sacrificing a piece to block a defending rook on the c-file or a bishop on a long diagonal can be a game-winning resource.
View opening pageFrench Defense
In closed positions typical of the French Defense, interference can be used to break deadlocks. A well-timed sacrifice to block a pawn chain's defender or a crucial file can suddenly open up the position for a devastating attack, completely changing the evaluation.
View opening pageFamous Interference Games
This brilliant game features a spectacular interference sacrifice by Reti (25. Be8!), which famously blocked the connection between Bogoljubov's rooks, immediately leading to a decisive advantage and demonstrating the profound power of this tactical motif at the highest level.
Tips for Club Players
Think of interference as cutting the telephone wire between two defending enemy pieces.
Look for situations where an enemy piece is guarding a critical square from a distance.
Don't be afraid to sacrifice a piece if it permanently breaks the opponent's defense.
Interference often pairs well with other tactics like pins or discovered attacks.
Frequently Asked Questions
Everything you need to know about interference
Interference is a tactical motif where you place a piece between two enemy pieces to break their line of communication or defense. It's like putting an obstacle in the path of a defender, preventing them from doing their job, often involving a sacrifice.
While blocking generally refers to putting a piece in front of an attack to shield yourself, interference specifically aims to sever the connection between two enemy pieces. It's an offensive tactic designed to disrupt their coordination rather than just defending your own pieces.
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