What is a fork in chess?
A fork is one piece attacking two enemy pieces at once. It is the first tactic worth learning, and the knight is the piece that does it best.
A fork is a single piece attacking two or more enemy pieces at the same time. Your opponent can only save one of them. That is the whole idea, and it is the first tactic most children learn because it wins material immediately and obviously.
Why the knight is the best forker
Any piece can fork. A pawn can attack two pieces diagonally. A queen can hit two along different lines. But the knight is the piece that does it most often, for one reason: a knight cannot be blocked, and nothing it attacks can attack it back.
A bishop attacking a bishop is a fair fight. A knight attacking a bishop is not, because the bishop has no way to hit the knight in return. Add a second target and your opponent is simply losing something.
A fork you will meet again and again
Look at this position. White plays and wins material.
White to play. The knight on b5 has a move worth finding.
The move is Nc7+. From c7 the knight attacks the black king on e8 and the rook on a8 at the same time. Because it is check, Black has no choice: the king must move. Then Nxa8 takes the rook.
Notice what made it work. The check is what removes Black's choice. A fork without check can sometimes be answered by counter-attacking; a fork with check cannot, because a check must be dealt with immediately.
How to actually get good at spotting them
Children who are good at forks are not calculating harder than everyone else. They have simply seen the shapes before. Two useful habits:
- Look for the pattern, not the move. Whenever two enemy pieces sit a knight's move apart from the same square, there is a fork waiting. Train your eye on the targets, not the knight.
- Check the undefended pieces first. A fork that wins a defended piece wins nothing. Scan your opponent's position for what is loose.
The king is always a valid target, which is why forks involving check are the most dangerous. A fork hitting king and queen has a nickname among club players: the family fork.
Where forks go wrong
The most common mistake is forking two pieces your opponent is happy to give up. Winning a knight while your own queen hangs is not a tactic, it is a trade you lost. Before you play a fork, check what your opponent gets to do in reply.
The second mistake is forking a square your opponent's pieces defend. The knight lands, the fork looks beautiful, and then a pawn takes it.
Forks are the first tactic in our Beginner course, and most children pick them up inside a few weeks. If your child can already spot a fork, they are ready for pins and skewers next.