What is checkmate?
The king is under attack and has no legal move to escape.
What is stalemate?
A player has no legal move but their king is not in check. The game is a draw.
Can pawns move backward?
No. Pawns move forward one square, or two on their first move, and capture diagonally.
What is castling?
A special move that moves the king two squares toward a rook and places the rook on the other side.
How do I improve at chess?
Practice tactics, study openings, and review your games.

