Legal and illegal moves.

 here's a brief overview of how the pieces move in chess and what constitutes legal and illegal moves:

Piece Movement:

• King: The king can move one square in any direction. The king is the most important piece in the game and if it is under attack and there is no legal move to escape the attack, the game is over.
• Queen: The queen can move any number of squares in a straight line in any direction - horizontally, vertically, or diagonally.
• Rook: The rook can move any number of squares in a straight line horizontally or vertically.
• Bishop: The bishop can move any number of squares in a diagonal line.
• Knight: The knight moves in an L-shaped pattern, two squares in any direction and then one square perpendicular to that.
• Pawn: The pawn can move one or two squares forward on its first move, and then one square forward on subsequent moves. Pawns can capture other pieces diagonally but can only move forward.

• Legal Moves:
• Legal moves in chess are those that follow the rules of the game. In addition to moving pieces according to their specific rules, legal moves include:
• Not moving a piece onto a square occupied by a piece of the same color.
• Not moving a piece in a way that would expose the king to check or leave the king in check.
• Not making more than one move per turn.

Illegal moves include:

• Moving a piece in a way that violates its specific movement rules.
• Moving a piece onto a square occupied by a piece of the opposite color (except when capturing).
• Moving a piece in a way that exposes the king to check or leaves the king in check.
• Making more than one move per turn.
• En passant move not following the required criteria.
• Players must always ensure that their moves are legal, and if a player makes an illegal move, they must take it back and make a legal move instead.