Fork
A single piece attacking two (or more) enemy targets at the same time, so at least one of them cannot be saved.
Key Ideas
- Any piece can fork, but knights are especially feared for it since their attack pattern is so hard to see coming.
- A "royal fork" attacks the king and another piece simultaneously, guaranteeing material gain since check must be answered first.
- Look for two enemy pieces that share a common attacking square, especially an undefended one.
- The classic "family fork": a knight attacking the king, queen, and a rook all at once.
How It Works
A fork happens whenever one piece simultaneously attacks two or more enemy pieces that cannot both be defended or moved to safety in a single reply.
Knight forks are the most notorious because the knight's L-shaped move pattern is the hardest for the human eye to visualize in advance — a knight can threaten a king and a rook from a square that looks, at first glance, harmless.
When the fork includes the enemy king, it is called a "royal fork": because the check must be dealt with immediately, the forking piece is guaranteed at least one free move to also win the other attacked piece.
Famous Games
Countless decisive games at every level
The fork is arguably the single most common tactic in amateur chess, and grandmaster games often feature far more disguised versions of the same basic idea.
Watch & Learn
Video lessons come and go, so instead of linking a specific clip that might disappear, here's a live search for this exact topic:
▶ Search YouTube for "chess fork tactic explained examples"