What is illegal move chess?

Illegal move in chess refers to a move made by a player that is against the rules of the game. It is a serious offence, and players can get penalized for making illegal moves. The rule of illegal moves is an essential and fundamental aspect of chess, and violations of the rule can result in the game being restarted or the player losing points.

An illegal move can occur in several ways, including:

1. Moving a piece to a square that is already occupied by another piece.
2. Moving a piece in a way that violates its movement rules, such as moving a bishop diagonally over an obstruction in the middle.
3. Breaking the special rules of the game, such as castling a king that has already moved from its original square.
4. Touching a piece without making a valid move or taking undue advantage of an opponent's move.

The penalty for making an illegal move is decided by the referee or the tournament director. In most cases, the offending player is given a warning for the first offence, and the game continues. However, severe or repeated violations can lead to disqualification, suspension, or even a ban from future tournaments.

In conclusion, players should be aware of the rules that govern chess and avoid making illegal moves to ensure a fair and enjoyable game for all players.