Project approval after AI review on November 2, 2026. Human proofreading is still pending.
Lesson 4
Three special rules
- What you will learn
- You use three special rules: castling, promotion and en passant.
- What you should already know
- How the pieces move and capture
- What check means
- Lesson 3: Check, checkmate and stalemate
Time: about 10 minutes
New to chess? Here every piece introduces itself, with all its moves: The pieces
Step 1 of 8
Look first
Castling is a special move involving the king and a rook: both move in the same turn. The king goes two squares towards the rook, and the rook jumps over it.
White wants to castle kingside, with the rook on h1. Tap the square the king moves to.
Arrow keys move the focus across the squares. Enter or Space marks a square or removes the mark.
Choose a square from a list
Position as a list
White
- King e1
- Queen d1
- Rook a1
- Rook h1
- Bishop c1
- Bishop c4
- Knight b1
- Knight f3
- Pawn a2
- Pawn b2
- Pawn c2
- Pawn d2
- Pawn e4
- Pawn f2
- Pawn g2
- Pawn h2
Black
- King e8
- Queen d8
- Rook a8
- Rook h8
- Bishop c5
- Bishop c8
- Knight c6
- Knight g8
- Pawn a7
- Pawn b7
- Pawn c7
- Pawn d7
- Pawn e5
- Pawn f7
- Pawn g7
- Pawn h7
Step 2 of 8
Decide
You can only castle if the king and rook have never moved and the squares between them are empty. The king must not be in check, pass through an attacked square or end up in check.
May White castle kingside now, with the rook on h1?
Arrow keys move the focus across the squares. Enter or Space selects a piece and moves it to a highlighted square. Escape cancels the selection.
Position as a list
White
- King e1
- Rook a1
- Rook h1
Black
- King e8
- Bishop c4
Step 3 of 8
Try it
You cannot castle kingside here. Castle queenside, with the rook on a1.
Arrow keys move the focus across the squares. Enter or Space selects a piece and moves it to a highlighted square. Escape cancels the selection.
Choose a move from a list
Position as a list
White
- King e1
- Rook a1
- Rook h1
Black
- King e8
- Bishop c4
Step 4 of 8
Try it with promotion
When a pawn reaches the last rank, it becomes another piece: a queen, rook, bishop or knight.
Your pawn on e7 is almost there. Move it to the last rank and promote it to a queen.
Arrow keys move the focus across the squares. Enter or Space selects a piece and moves it to a highlighted square. Escape cancels the selection.
Choose a move from a list
Position as a list
White
- King g1
- Pawn e7
Black
- King a2
Step 5 of 8
Try it with en passant
When a pawn advances two squares at once, it may land right next to an opponent’s pawn. That pawn can still capture it on the next move, as if it had only moved one square.
This is called en passant, French for “in passing”.
Black has just moved the pawn from d7 to d5. Capture it en passant.
Arrow keys move the focus across the squares. Enter or Space selects a piece and moves it to a highlighted square. Escape cancels the selection.
Choose a move from a list
Position as a list
White
- King g1
- Pawn e5
Black
- King g8
- Pawn d5
Step 6 of 8
How the three rules work
Castling: the king moves two squares towards the rook, and the rook lands next to the king on the other side.
If your king was in check earlier but did not move, you may still castle later.
Promotion: when a pawn reaches the last rank, it immediately becomes a queen, rook, bishop or knight. Usually you choose a queen. You can do this even if you still have your queen.
En passant: if an opponent’s pawn advances two squares and lands right next to your pawn, your pawn may capture it diagonally. Your pawn moves onto the square the other pawn passed over. You can only do this on the very next move.
Key idea
Before castling, check: has the king or rook moved before? Is anything between them? Is the king in check, or is a square it passes through or lands on controlled by the opponent?
When does this apply?
This applies to both kingside and queenside castling, for White and Black. Once the king has moved, you can no longer castle at all. If one rook has moved, you can only castle with the other rook, provided it has never moved.
Step 7 of 8
New position, same idea
For Black, rank 1 is the last rank. A pawn is promoted there too.
You are playing Black. Turn your pawn on b2 into a queen that White cannot capture straight away.
Arrow keys move the focus across the squares. Enter or Space selects a piece and moves it to a highlighted square. Escape cancels the selection.
Choose a move from a list
Position as a list
White
- King g1
- Rook a1
Black
- King g8
- Pawn b2
Step 8 of 8
What you take away
Now you know about castling, promotion and en passant. In the next lesson, you will check which pieces are attacked before making your move.