Move the King: Relocate the king to a safe square where it isn’t under threat. This is the most direct response.
Capture the Attacking Piece: If possible, capture the piece that is putting the king in check to eliminate the threat.
Block the Check: Interpose a piece between the attacking piece and the king, blocking the check. For example, moving a pawn or another piece to stop the attack.
Different Types of Checks:
Direct Check: A piece directly threatens the king. For example, a rook on an open file attacking the king.
Discovered Check: A check given by moving a piece, revealing an attack by a different piece. For instance, moving a knight that uncovers a bishop’s attack on the king.
Double Check: Both the moving piece and the revealed piece check the king simultaneously. This is particularly powerful because the only response is to move the king.