Check means a king is under attack by an enemy piece. Checkmate means the king is in check and there is no legal way to escape, which ends the game with a win for the side giving the mate. The king is never actually captured; the game stops before that point. Understanding both ideas, and the draw that sits beside them, makes every other rule easier to follow.
What Check Looks Like
A king is in check when an enemy piece could capture it on the next move if the position stayed the same. You must respond immediately. You cannot ignore a check or make a move that leaves your king attacked. Saying the word check aloud is polite but not required.
Three Ways to Answer a Check
- Move the king to a square that no enemy piece attacks.
- Block the line between the attacker and the king by placing one of your pieces in the way. This works against queens, rooks and bishops, but not against a knight, which jumps.
- Capture the attacking piece, using any of your pieces that can legally do so, including the king if the attacker is undefended.
If none of these three is possible, the position is checkmate.
Walking Through a Mate
Take a simple case. Black’s king is on the back rank, hemmed in by its own pawns on f7, g7 and h7. A white rook lands on the eighth rank and attacks along it. The king cannot step forward because its own pawns are there, nothing can block between the rook and the king, and no black piece can capture the rook. That pattern is the back rank mate.
How to Check Your Own King Safety
- Before each move, look along every line toward your king for rooks, bishops and queens.
- Look at knight jumps around your king too.
- Remember that pawns attack diagonally forward, not straight ahead.
- A piece that shields your king from an attacker is pinned and cannot leave the line.
Check Compared With Mate
| Term | Meaning | Game result |
|---|---|---|
| Check | King attacked, an escape exists | Game continues |
| Checkmate | King attacked, no escape | Win for the attacker |
| Stalemate | King not attacked, no legal move | Draw |
Beginners often give a check just because they can. A check is only useful if it gains something, such as forcing the king into a worse spot or winning a piece. Before each check, look at where the king can go and what you will do next.
Walkthrough: The Shortest Possible Game
The fastest checkmate in chess, known as the fool’s mate, shows every part of the idea. It only happens when White plays very weakly, but it is a clear example.
- White plays f3, moving the pawn in front of the king’s bishop one square. This opens the diagonal from e1 to h4.
- Black plays e5, opening a path for the queen.
- White plays g4, opening the h4 square for the black queen. Now the white king has no pawn on f2 or g3 to shield the diagonal.
- Black plays Qh4, giving check along the diagonal h4-g3-f2-e1.
- Test the three answers. The king cannot move: f2 is attacked by the queen, and d1, f1, d2 and e2 are occupied by White’s own pieces. No piece can block on g3 or f2. Nothing can capture the queen on h4.
- All three answers fail, so it is checkmate and Black wins.
In notation the game is 1. f3 e5 2. g4 Qh4#. The lesson is to keep an eye on lines that lead to your king, and to avoid weakening the pawns in front of it without a reason.
Common Scenarios
Double check
When two pieces attack the king at once, blocking or capturing one attacker does not help. Only a king move can answer a double check.
Discovered check
A piece moves away and uncovers an attack from a rook, bishop or queen behind it. The moved piece can also make its own threat, which makes this a strong tactic.
Smothered mate
A knight gives check to a king that is surrounded by its own pieces. Because a knight cannot be blocked, and the king has no free squares, this is checkmate.
Stalemate instead of mate
You have a large material edge, but your last move leaves the opponent without a legal move while their king is not in check. The game is a draw. Always count the opponent’s legal moves before giving a quiet move in a winning position.
Mistakes to Avoid
- Making a move that leaves your king in check. It is illegal, and in tournament play it can carry penalties.
- Giving random checks. Each check should gain something, or you may drive the king to a safer place.
- Forgetting that a pinned piece cannot move off the line. It cannot be used to block or capture if moving it exposes the king.
- Believing the king can capture any attacker. The king cannot capture a piece that is defended, because it would then be in check.
- Overlooking stalemate. Winning positions can become draws in one careless move.
Quick Troubleshooting
| Symptom | Likely cause | What to try |
|---|---|---|
| Cannot tell if it is mate | Checking only one answer | Test all three: king move, block, capture, in that order |
| Opponent escapes a check you expected to win | Missed a defender or a flight square | List all squares around the king and who attacks them |
| Game ends in a draw when you were winning | Stalemate | Leave the opponent a legal move, or give check |
| Software says your move is illegal | You left your king attacked or moved a pinned piece | Look for lines to your king after the move |
Glossary
- Check: a direct attack on the king.
- Checkmate: check with no legal reply.
- Stalemate: no legal move and no check, which is a draw.
- Pin: a piece that cannot move because it shields a more valuable piece behind it.
- Flight square: a square the king can move to.
- Back rank mate: mate along the first or eighth rank when the king is blocked by its own pawns.
- Perpetual check: repeated checks the king cannot escape, often leading to a draw.
FAQ
Can a king move next to the other king?
No. Kings may never stand on adjacent squares, since each would attack the other.
Can I put my own king in check?
No. Any move that leaves your king attacked is illegal. If it happens by mistake in a casual game, take the move back.
Do I have to say check?
No. Announcing check is a courtesy that many casual players use, but the rules do not require it. The opponent must still respond to the attack.
What is the difference between check and checkmate in practice?
With check, at least one legal reply exists, and the game goes on. With checkmate, no reply exists, so the game ends at once with a win for the side that delivered it.
Can a game end without checkmate?
Yes. Players can resign, agree a draw, reach stalemate, repeat a position three times, or run out of time. Checkmate is only one of the ways a game ends.
The Short Version
Check is an attack on the king that you must answer by moving, blocking or capturing. When none of these works, it is checkmate and the game is over. Test all three answers before declaring mate, and always watch for stalemate.