Puzzle of the Week: Knight Fork Wins the Queen

This week's puzzle features one of the most satisfying tactical motifs in chess — the knight fork. The knight is the only piece that can jump over others, and when it lands on the right square, it can attack two (or more!) enemy pieces at once. Today, White finds a way to fork Black's king and queen, winning the most powerful piece on the board.

The Position

White to play and win material. Look at the position below and find the combination that uses a knight fork to win Black's queen.

White has a knight on e5 and a rook on a1. Black has a queen on d7, a rook on a8, and a king on g8, with pawns on a7, b7, f7, g7, and h7. White's king is safe on g1 with pawns on a2, b2, f2, g2, and h2.

Hints

Think about these questions before checking the solution:

• The knight on e5 is centrally placed and very active. Which squares can it jump to?
• From e5, a knight can reach c6, d7, f7, g6, g4, f3, d3, and c4. Do any of these squares create a fork?
• Is there a square where the knight simultaneously attacks both the king on g8 and the queen on d7?

Solution

1. Nxf7! (Knight captures on f7 with check!)

The knight captures the pawn on f7, delivering check to the king on g8. But it does not stop there — the knight on f7 also attacks the queen on d7. This is a textbook royal fork: check on the king, attack on the queen, and Black can only save one.

• 1...Kf8 — The king steps aside. Now 2. Nxd7 captures the queen. White wins a queen and a pawn for a knight — a devastating material advantage.
• 1...Kh8 — Same result. 2. Nxd7 picks up the queen.
• 1...Kg7 — And again, 2. Nxd7 wins the queen.

No matter where the king runs, the knight collects the queen on the next move. This is the beauty of a fork with check — the opponent has no time to save both pieces.

Understanding Knight Fork Patterns

Knight forks are deadly because the knight's unique L-shaped movement makes them hard to anticipate. Here are the key patterns to remember:

• Royal fork: The knight checks the king while simultaneously attacking the queen. Since the king must move out of check, the queen is lost. This is the most common and most devastating type of knight fork.
• The L-shape advantage: Knights move two squares in one direction and one square perpendicular. This means they attack squares of the opposite colour from the one they stand on — a unique property that makes forks surprising.
• Same-colour rule: A knight can fork two pieces only if those pieces are on the same colour square. In this puzzle, both g8 (king) and d7 (queen) are on dark squares, making the fork from f7 (a light square) possible.
• Unprotected pieces are targets: Always scan the board for enemy pieces that are undefended. A knight fork is most powerful when the forked pieces cannot simply capture the knight.

"A knight on the rim is dim, but a knight in the centre is a monster." — Classic chess wisdom about knight placement.

Key Lesson: Scan for Fork Squares

Every time your opponent's king and queen (or king and rook) are positioned on the same colour square, ask yourself: "Is there a square where my knight attacks both?" With practice, you will start spotting these opportunities within seconds.

Here is a simple method to find knight forks:

• Identify two valuable enemy pieces (king + queen, king + rook, queen + rook).
• Check if they are on the same colour square — if not, a knight fork is impossible.
• If they are, look for the L-shaped jump that reaches both targets from one square.
• Check whether that fork square is accessible (can your knight reach it in one or two moves?).

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