Lesson Plan 7: Castling
Two Pieces, One Move, Four Conditions
Prerequisites
Lessons 1-6
Learning Objectives
- Students will castle kingside and queenside correctly
- Students will state the conditions that allow castling
- Students will identify positions where castling is not permitted
- Students will explain why castling early is usually a good idea
Materials Needed
- Chess sets (1 per 2 students)
- Demonstration board
- Four cards, one per condition
- Blank paper for the castling checklist
When Castling Is Allowed
- Neither piece has moved: this king and this rook must both be on their original squares, having never moved
- The squares between are empty
- The king is not in check right now
- The king does not pass through or land on an attacked square
- The rook may be attacked: only the king's squares matter, which surprises everyone
Lesson Timeline
5 min
Review & Hook
Ask what the king has been doing for six weeks — standing in the middle of the back rank, where all the lines open. "Today he gets to run, and take a bodyguard with him."
12 min
Both Sides
- Demonstrate kingside castling: king two squares toward the rook, rook jumps over to the other side
- Demonstrate queenside: the same idea, but the rook travels further and b1 must also be empty
- Have every pair do both, twice, from the starting position with the pieces between removed
- Name the move properly: it is one move, and the king is always moved first
12 min
The Four Conditions
- Introduce one card at a time and build a position that breaks it
- Broken: the rook moved out and came back — still not allowed, ever again on that side
- Broken: a knight is still on f1
- Broken: the king is in check this moment
- Broken: f1 is attacked, so the king would pass through danger
- Allowed: the rook on h1 is attacked — castling is still legal
8 min
Spot the Castle
- Set up six positions; for each, the class votes allowed or not allowed
- Ask for the condition by name whenever the answer is no
6 min
Castle Race
Partners play the race below.
2 min
Wrap-Up
Ask for the four conditions, then the trick question: "Can you castle if the rook is attacked?"
Castle Race Rules
- Players set up a normal game
- The first player to castle legally scores a point, and the game continues
- A player who moves their king or rook without castling cannot score that point
- Play on for ten more moves and count material as well
- Discuss: did racing to castle cost anyone a piece?
Teacher Tip: Teach the hand motion: king first with one hand, rook second with the same hand. Children who move the rook first often get told by an opponent that they have made a rook move, and in a tournament that is exactly what it would be.
Assessment
- Observation: during the race, check that the king moves first and lands on the right square
- Quick check: show three positions and ask allowed or not allowed, with the reason
- Exit question: "Name the only piece attack that does not stop you castling."
Common Mistakes to Address
- Moving the rook first, or moving the king three squares
- Castling out of check
- Castling through an attacked square
- Believing an attacked rook prevents castling
- Castling queenside without noticing the knight still on b1
Differentiation
- Support: Put a sticker on the two squares the king lands on, g1 and c1, so the destination is never in doubt.
- Challenge: Ask when castling is a bad idea — an open file in front of the king, or an attack already gathering on that side — and have them find a game where castling the other way would have been better.