Find the second target.

A fork is a move that attacks two or more enemy targets with one piece. Any piece can fork, including a pawn or king. Knights are particularly useful because their attacks do not follow the straight lines used by rooks, bishops and queens.

Start by looking for valuable pieces that are close enough to share a knight’s attacking square. Then ask whether your knight can reach that square legally. Finally check whether it can be captured. A diagram that resembles a fork is not enough if the opponent can simply take the knight.

A fork that includes the king gains urgency. The opponent must answer the check before dealing with the other target. Even then, consider whether the checking knight can be captured, or whether the king can escape in a way that protects the second target.

White’s knight is on g5; Black’s king is on h8 and queen on d8. Moving the knight to f7 attacks both h8 and d8. The king is in check, so Black cannot just move the queen away. Black has no piece that can capture the knight, and a knight check cannot be blocked.

One legal continuation is Nf7+ Kh7 Nxd8. The plus sign means check; the x means a capture. White wins the queen on d8. Black could choose a different legal king move, but none saves the queen in this sparse position.

In a real game, extra pieces may change the answer completely. A rook on f8 could capture a knight on f7, for example, if the capture also removed the check and did not expose its own king. Always calculate the actual board rather than remembering only the shape of the fork.

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Which jump creates the fork, and what comes next?

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Nf7+ attacks the king on h8 and queen on d8. After a legal king move such as Kh7, Nxd8 wins the queen.

A pin happens when moving a piece would expose a more important piece behind it to attack. If the piece behind is the king, it is an absolute pin: exposing the king is illegal. A relative pin involves another valuable piece, such as a queen. Moving out of a relative pin may be legal, even if it loses material.

Here the White rook on e1, Black bishop on e7 and Black king on e8 line up on the e-file. The bishop blocks the rook’s attack. Moving the bishop to d6 may look natural, but it would open the e-file onto Black’s king. That move is illegal.

The bishop is not lost just because it is pinned. Black can move the king out of the line when safe, defend the bishop or create a suitable interruption of the attack. In this example Kf8 unpins it. A pin creates a restriction that you may be able to use; it is not a guarantee of a winning capture.

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Can Black play Bd6?

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No. Bd6 would uncover the rook’s attack on the king. Black can instead move the king off the e-file, for example Kf8, if that destination is safe.

Before choosing a tactical move, identify your purpose in plain language: “This knight move checks the king and attacks the queen.” Then try to refute it for the opponent. Look for captures of the attacker, checks against your own king, and moves that protect both targets at once.

When reviewing a missed tactic, do not stop at the engine’s first move. Replay the reply and the follow-up. Write down the clue you missed—an undefended queen, two targets on the same knight geometry, or a piece unable to move because of its king. That clue is what you want to recognize next time.

Practice with a few positions slowly. Cover the answer, choose a move, and name the opponent’s strongest response. If the move does not work, explain why. A well-explained failed candidate can teach more than guessing a correct move without seeing the continuation.