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Goal: Castle: move your king two squares towards a rook, and the rook jumps over to the other side. 4 puzzles · ★★★ = no mistakes.
Castling is a special move with the king and a rook — the only time two pieces move at once.
Castle on the king’s side (short castling).
Tap your king, then the square two steps to the side. You cannot castle out of check, through an attacked square, or into check.
Castling is the only move where two pieces move at once. Rules: the king and that rook have not moved, the squares between are empty, and the king is not in check and does not pass through or land on an attacked square.
Chapter 5 — Special moves and mixed: The three special rules every player must know, then forks and mixed puzzles that use everything.