Meet the king

You've met the pawns, rooks, knights, bishops and queen. There is one piece left: the king.

Every player begins with one king. White's king starts on e1, and Black's starts on e8, beside their queens. We have already used kings in some practice positions, but now it's time to understand why they are so important.

The queen may move in many directions across the board, but the king has a much shorter reach. And there's one crucial difference: a king must never be left under attack.

One square in any direction

A king normally moves one square at a time. It can step forwards, backwards, sideways or diagonally — a little like a queen that only takes a single step.

Look at the king on e4. There are eight squares immediately beside it. On this clear board, all eight are safe.

The king cannot move two or three squares in one ordinary move. It cannot jump over pieces, either.

One special exception: later we will learn about castling, a move involving the king and a rook. We're leaving that for the rules chapter so we can explain its conditions properly.

The board's edge changes its reach

On e4, the king has up to eight neighbouring squares. In a corner, it has only three.

From a1, the king can reach only a2, b1 and b2 on a clear board. A king near the edge has fewer choices, which matters when it needs to escape a threat.

Moving, capturing and defending

Like the pieces you've already learnt, the king can capture an opponent's piece on a square it could otherwise move to, and it defends friendly pieces on neighbouring squares.

The difference between defending a square and moving onto it is important. In this position the king on e4 defends two friendly pawns but cannot move onto their squares.

There is another rule that makes the king different: it may not move onto an attacked square, even to capture something. A defended enemy piece may be out of reach even when it is right beside the king.

What does check mean?

A king is in check when an opposing piece attacks its square. Think of check as an immediate warning: your king is under threat.

The king isn't captured and removed from the board. Instead, the player in check must make a legal move that gets the king out of check.

Sometimes that means moving the king. In other positions, a player can block the attack or capture the attacking piece. We'll practise the full rules of check and checkmate later.

A nearby square isn't always a safe square

Remember the rook's straight lines? Here's why they matter to the king.

A black rook stands on e8. Its open e-file reaches the white king on e4, putting White in check.

From e4, e3 and e5 are only one step away, but they are not legal king moves. Both squares are still on the rook's line of attack. The king must step off that file to find safety.

Kings must keep their distance

Every king controls the squares immediately beside it. That means two kings can never stand next to each other in a legal position.

The black king on g5 controls f4 and f5. The white king on e4 cannot step to either one, even though both are a single step away.

This isn't a special rule about touching pieces. It's the ordinary rule about not moving your king into check.

Can the king capture that piece?

Imagine the king on e4 seeing a black knight on f5. That's only one square away, so capturing it might seem possible.

But there is a black rook on f8. The rook protects the knight on f5, so capturing that knight would move the king onto a square attacked by the rook.

The king cannot make that capture. It must choose a safe alternative. The knight also attacks d4 and e3, reducing the king's options further.

King vision: see the danger before the move

Try these without looking at the highlighted squares:

1. A king stands on d4 on an otherwise clear board. Can it reach e5 in one move? Can it reach f6?
2. A white king on e4 is checked by a black rook on e8 along the open e-file. Why is e3 unsafe?
3. A white king on e4 is near a black king on g5. Why can White not move to f5?
4. A black knight on f5 is defended by a black rook on f8. What would happen if White's king captured the knight?

Answers: (1) e5: yes, one step diagonally; f6: no, two squares away. (2) The rook still attacks e3 along the same file. (3) The black king attacks f5. (4) White would move into the rook's attack, so the capture is illegal.

Have a go on the board

Try the king on e4 in the rook-check position. Select the king to see its legal destinations, then make a move to escape check. The board follows real chess rules, including king safety.

King Safety Challenge: find every safe square

Our earlier chapters used Capture Challenges to practise a piece's movement. For the king, we're changing the goal: identify every safe square.

In each position, select the squares that the white king can legally move to. Some neighbouring squares are attacked by the opponent. A capture is allowed only if the destination remains safe after the capture.

You can select squares on the board or using the square buttons. Check your choices, correct any mistakes, then move on to the next position.

The key habit is to look at the opponent's attacks before choosing a king move. You don't have to solve a checkmate puzzle here — just learn to recognise legal destinations.

Your king can help later in the game

In the opening and middlegame, kings often need protection because many pieces are still active. But later, when fewer pieces remain, a king can become an important active helper — supporting pawns and controlling nearby squares.

We'll explore the king's role in endgames later. For now, remember that keeping your king safe and using your king actively are both part of chess. The right balance changes as the game develops.

What to remember

• White's king begins on e1; Black's begins on e8.
• A king normally moves one square in any direction.
• It can capture an enemy piece on a neighbouring square only if that square is safe.
• It can defend friendly pieces but cannot move onto their squares.
• Check means the king is being attacked and the player must respond legally.
• A king may never move into check or remain in check after a move.
• Two kings cannot stand next to each other.
• Castling, checkmate and stalemate come in the next rules chapters.

Knowledge check

Can you tell the difference between a square your king could reach and a square your king may safely occupy? Let's check.