London System X Ray Attack in Chess
The London System X Ray Attack is a tactical idea where one piece attacks a target through a “screen” piece using an x-ray line. In the London, this often centers on the dark-squared bishop on f4 (or the rook/queen behind it) aiming along diagonals toward e5, c7, or h6 after the defining London setup with Bf4 and e3.
To spot it, look for moments when your bishop on f4 (or a rook/queen behind it) attacks a square where the opponent’s piece blocks the line—then check whether that blocker is pinned or can be removed with tempo. To use it, create or maintain the x-ray by keeping the line open (often by playing c3/e4 breaks or forcing exchanges), then exploit the fact that the “hidden” attacker can win material once the blocker moves.
Frequently Asked Questions: London System X Ray Attack
- What exactly makes it an “X Ray Attack” in the London System?
- It’s when your piece attacks a target through an intervening enemy piece—commonly along the f4 diagonal—so the blocker can’t move freely without exposing something worse.
- Which London pieces usually create the x-ray line?
- Most often the bishop on f4 creates the key diagonal pressure, with the queen or rook behind it (or another long-range piece) providing the second layer of attack on the same line.
- How can I recognize the tactic during a game?
- Watch for positions where an enemy piece sits on a square between your attacker and a valuable target (like e5, c7, or h6). If that blocker is pinned or vulnerable to a forcing move, the x-ray motif is likely present.
- What’s a practical way to execute a London System X Ray Attack?
- First, set up the London structure so the line is active (typically with Bf4 and e3). Then play a forcing move that either removes the blocker or compels it to move, so your hidden attacker wins material or forces a favorable exchange.