The Fork

One piece attacks two or more enemy pieces at the same time. Only one can be saved. You take the other. That is the whole pattern, and it wins more material at every rating than anything else in chess.

The anatomy

Every fork has three parts: the forker (your piece), the targets (two or more of theirs), and the geometry that lines them up. Train your eye on the geometry and forks stop being lucky accidents.

The royal family

• Knight forks are the aristocracy. Knights attack in a shape nothing else uses, so their threats hide in plain sight. The royal fork, king and queen skewered on one hop, is chess’s single most profitable move.
• Pawn forks are the peasant uprising. One step forward, two pieces hanging. Watch for enemy pieces parked one square apart, two ranks up from a pawn.
• Queen forks almost always pair a check with a loose piece. Check plus threat is her entire business model.
• King forks exist, they are hilarious, and they win endgames.

Spotting them before they spot you

After every enemy move, ask what ALL of that piece’s new attacks are, not just the obvious one. Then scan for two of your own pieces on knight-colored squares or on the same line. Forks live in the question nobody asks.

How to stop donating material

Loose pieces drop off. Keep pieces defended, keep the king and queen off matching knight-hop squares, and treat any enemy knight within three squares of your queen as armed and dangerous.

Drill it

Set up any position from your last loss. Find every legal knight move for both sides. Count how many attack two things. That number is why you lost.