Rules in playing

 The main rules in chess are as follows:

1. Board Setup: Chess is played on a square board divided into 64 squares of alternating colors. Each player starts with 16 pieces: one king, one queen, two rooks, two knights, two bishops, and eight pawns.

2. Piece Movement: Each type of chess piece has its own unique way of moving across the board.

   - The king can move one square in any direction.

   - The queen can move any number of squares in any direction (horizontally, vertically, or diagonally).

   - The rook can move any number of squares horizontally or vertically.

   - The bishop can move any number of squares diagonally.

   - The knight moves in an "L" shape: two squares in a straight line, and then one square perpendicular to that.

   - Pawns can move forward one square, but on their first move, they have the option to move forward two squares. Pawns capture diagonally.

3. Objective: The primary objective in chess is to checkmate your opponent's king. This means placing the opponent's king under attack in such a way that it cannot escape capture on the next move.

4. Check and Checkmate: When a player's king is under attack by an opponent's piece, it is said to be in check. The player must get their king out of check on their next move; otherwise, it is checkmate, and the game is over.

5. Stalemate: If a player's king is not in check but has no legal moves to make, it is a stalemate. The game ends in a draw, and no player wins.

6. Castling: A special move that involves the king and one of the rooks. It allows the king to move two squares towards a rook, and the rook moves to the square next to the king. Castling is subject to certain conditions: neither the king nor the rook involved should have moved previously, the squares between them should be unoccupied, and the king should not be in check or pass through a square that is under attack.

7. En Passant: This is a pawn capture that can occur when a pawn moves two squares forward from its starting position, and an opponent's pawn could have captured it if it had only moved forward one square.

8. Promotion: When a pawn reaches the opposite end of the board, it can be promoted to any other piece (except a king). The player usually chooses to promote it to a queen for its increased power, but other choices are possible.

These are the basic rules of chess. There are additional rules and variations in chess, such as pawn promotion rules, the fifty-move rule, and draw by repetition. It's always good to familiarize yourself with the specific rules and regulations of the chess organization or tournament you are playing in.