Fork in Chess: the Double Attack That Wins Material
A fork is a move in which a single piece attacks two (or more) enemy pieces at the same time. Your opponent can only rescue one of them per move, so the other one is left to be captured. It is the most common tactical pattern in chess and, for players who are starting to win games, the most profitable one to learn.
What is a fork
Every fork has the same three ingredients:
- An attacking piece that lands on a square from which it sees two targets.
- Two targets that cannot both be protected with a single move.
- A safe forking square: if the forking piece can simply be captured for free, the fork is worthless.
You will also hear the term double attack. The difference is small: "fork" usually describes one piece hitting two others, while "double attack" is the general name for any move that creates two threats at once, including a mate threat combined with an attack on a piece.
When one of the targets is the king, the fork becomes even stronger. Your opponent has to get out of check first and has no time to save the other piece. A fork that hits king and queen together is called a royal fork.
The knight, king of forks
Any piece can fork, but the knight is the specialist, for two reasons:
- It jumps. Nothing standing in between can block the attack.
- Nobody hits back. A piece attacked by a knight never attacks that knight in return, unless it is another knight. A queen forked by your knight cannot just take it.
A geometry tip that makes knight forks easier to spot: every square a knight attacks is the same color (the opposite color of the square it stands on). So whenever your opponent's king and queen sit on squares of the same color, it is worth looking for a knight square that reaches both.
To review the L-shaped move, see how the knight moves.
Pawn forks
The pawn is the cheapest unit on the board, which makes a pawn fork devastating: any piece it attacks is worth more than the pawn. A pawn that steps forward and hits two pieces diagonally usually wins one of them, even if the pawn is captured afterwards.
Notice the classic setup: two enemy pieces side by side, one square apart, in front of a pawn that can advance. A bishop and knight developed to d6 and f6 (or c6 and e6) are frequent victims.
Queen, bishop and rook forks
The queen forks in eight directions, so she shows up in plenty of double attacks, especially with check. The catch is her value: if one of the targets is defended and can capture her, the fork backfires.
Watch out: if the target on the rank were a rook, it would simply take the queen. Before forking with your queen, check that neither target can capture her.
The bishop forks along diagonals (for example king and rook on the same long diagonal), and the rook forks along ranks and files, which is very common in endgames when it hits two pawns or a king and a loose piece. Even the king forks in the endgame, when it reaches two undefended pieces.
How to find forks in your games
Forks do not appear out of nowhere: they grow out of loose (undefended) pieces and badly placed ones. Before each move, run this quick checklist:
- Which enemy pieces are undefended? They are the natural targets.
- Are the king and queen lined up, or on the same square color? Look for a knight square, a diagonal or a rank that reaches both.
- Can one of my pieces reach a square that hits two targets? Check that the square is safe.
- Can I force a piece onto a forking square? Sometimes a sacrifice with check drags the king exactly where you want it (see deflection and decoy).
💡 Tip: forks matter on defense too. Before you move, ask "where can their knight jump next?". Many forks could have been avoided with that one question.
How to defend against a fork
- Prevent it: do not leave your king and queen a knight's jump away from the same square, and avoid loose pieces.
- Counter with a check: if the fork has already landed, look for a check or a bigger threat before giving up the piece.
- Save the more valuable piece and, if possible, make your opponent pay something for the other one.
Fork puzzles
Tap (or click) a piece and then its destination square. The puzzles go from easier to harder.
Hint
Find a square where the knight gives check and attacks the queen at the same time.
Show solution
1.Ne7+ Kh8 2.Nxc6
1.Ne7+ is a royal fork: check to the king on g8 and an attack on the queen on c6. The king only has h8, and the knight takes the queen.
Hint
The king on g8 and the rook on a8 sit at the ends of two diagonals that cross in the center of the board.
Show solution
1.Qd5+ Kh7 2.Qxa8
1.Qd5+ checks along the d5–g8 diagonal and attacks the a8 rook along the d5–a8 diagonal. Once the king moves, 2.Qxa8.
Hint
The rook and knight stand side by side on the 5th rank, one square apart.
Show solution
1.d4 Rd5 2.dxe5
1.d4 attacks the rook on c5 and the knight on e5. Black's best is to save the rook with tempo (1...Rd5, hitting the pawn), but after 2.dxe5 Rxe5 White is a piece up for a pawn.
Hint
A rook sacrifice with check forces the king to h8. Which fork appears then?
Show solution
1.Rh8+ Kxh8 2.Nxf7+ Kg8 3.Nxd8
1.Rh8+! Kxh8 (forced) 2.Nxf7+ forks the king on h8 and the queen on d8. After 2...Kg8 3.Nxd8, White has traded a rook for queen and pawn.
Frequently asked questions
Are a fork and a double attack the same thing?
Almost. Every fork is a double attack, but "double attack" also covers moves with two threats coming from different sources, such as a mate threat combined with an attack on the queen.
Which piece forks the most?
The knight, because it jumps and because no piece it attacks can hit back, except another knight. The queen and the pawn come next.
What is a royal fork?
A fork that attacks the king and the queen at the same time. Since the king must get out of check, the queen is almost always lost.
How do I practice forks?
Solve short puzzles every day and, in your own games, ask before each move which enemy pieces are loose. Then move on to the pin, the next pattern in the course.