Two attacks from one chess move

Published 2 October 2026 · Updated 20 October 2026

A single chess move can give the opponent two problems at once. This article is only that idea: the fork, the pin, and the skewer. It does not repeat the opening checklist on the learn hub, and it does not repeat the rules on the guide. Use those pages for check, castling, and how a game on this site starts. Use this page when you already have a position and want to know whether one move is doing two jobs.

1. A fork attacks two pieces at once

A fork is one piece attacking two enemy pieces on the same turn. The knight is the usual piece, because it jumps and the two targets do not have to share a line. If one of the targets is the king, the opponent must answer the check. The other target is what you hope to take next, unless they can move it while escaping check, or capture the knight.

A fork against two pieces that are not the king can still fail. If either piece can capture the attacker, or if one piece can move and defend the other, you do not automatically win material. Name both targets, then name their answers, before you call the move a win.

2. A pin keeps a piece from moving

A pin is a line. Your bishop, rook, or queen attacks an enemy piece, and a more important enemy piece stands on the same line behind it. If the front piece moves, the piece behind is attacked. When the piece behind is the king, the front piece is not allowed to move at all. When the piece behind is a queen, the front piece can move, and doing so usually loses the queen.

The pin is not a capture yet. It is a reason the front piece should stay, and a reason you might add a second attacker to it. If you capture the pinned piece with something they can recapture, count what stands behind before you trade.

3. A skewer hits the valuable piece first

A skewer is the pin turned around. The more important piece is in front, on the line, and the less important piece is behind it. You check the king, or you attack the queen, and when that piece steps off the line the piece behind is taken.

The difference matters because the front piece cannot stay. In a pin, the front piece is stuck. In a skewer, the front piece is the one that has to move, and the piece behind pays for it. If the piece behind can move on the same turn the king escapes, the skewer does not collect it.

4. One move, then their best answer

After you see a fork, a pin, or a skewer, play the opponent’s reply in your head before you play the move. A knight fork of king and rook fails if the king can take the knight. A pin fails if your pinning piece is loose and they can take it. A skewer fails if a friendly piece can be dropped between, or if the piece behind is not actually on the line.

This site will not refuse a legal move that looks tactical and loses. The highlight shows where the piece can go. It does not label the tactic.

Examples on this board

1. A knight fork. A White knight stands on c7. The Black king is on e8 and a Black rook is on a8, with those squares otherwise able to be attacked. The knight attacks e8 and a8 at the same time. Black must answer the check. If the rook is still on a8 after that answer, the knight takes it next.
2. A fork that is not free. The same knight forks a rook and a bishop, and the bishop can capture the knight. There is no king in check. Black takes the knight. White won nothing. The two attacks were real, and the answer was the capture.
3. A pin along a diagonal. A Black bishop on a5 looks through c3 to a White king on e1, with a White knight on c3 and the squares between empty. The knight cannot step away, because the bishop would then attack the king. The knight can still be a defender of other squares. It cannot be the piece that leaves c3.
4. A skewer on a file. A White rook on a1, a Black king on a4, and a Black queen on a8, with a2, a3, a5, a6, and a7 empty. The rook checks the king. The king must leave the file. The queen on a8 is then on the rook’s line, and the rook takes it if nothing else has changed.
5. A skewer with a block. The same file, except Black also has a piece that can move to a3 or a2 on the king’s escape turn. The king steps off, and that piece steps onto the file. The queen is no longer available. Seeing the line was not enough. The reply filled it.

Why it matters

One attack can be answered by moving the attacked piece. Two attacks cannot both be answered by one move unless that move captures the attacker, blocks the line, or saves both targets at once. Players who only count the piece they are taking miss the second target, and they also miss the reply that takes their attacker.

These three patterns are the ones worth naming out loud on this board. The date is 2 October 2026, the day this page was written against the live rules. It does not change castling, promotion, or the online queue.

Closing

Before you play a tactical move, say which pattern it is and what their best answer does to the second piece. A fork needs two targets. A pin keeps the front piece still. A skewer drives the front piece away and takes what stood behind. Go back to reading a quiet position when nothing is attacked twice, and play the position on the home page when you want the board to enforce the line.