The board

There are sixty-four (64) squares on a Chessboard.
If you play the white pieces, the letters (files) are sorted by alphabetical order: A - H.
If you play the black pieces, the letters are sorted in reverse alphabetical order: H - A.
The numbers on the side of the board are called ranks.
If you play the white pieces, they are counted upwards: 1 - 8.
If you play the black pieces, they are counted downwards: 8 - 1.

The King

The king can be moved two different ways:

• To any adjoining square, which is not attacked by one or more of the opponent's pieces.



• Castling – the king is transferred from its initial square two or three squares towards the rook, then that rook is transferred to the square the king has just crossed. Castling must be the first move of the king and the rook of the same color and on the same ranks. Castling is the only situation where two pieces move at the same time. Castling cannot be made if the king is under attack.
  If the squares between the rook and the king are occupying, the castling is temporarily prevented.

The Queen

The Queen can be moved to any square along the file, the rank or the diagonal it stands on and it cannot skip over intervening pieces. The Queen can control larger number of squares than any other chess piece, making it the most powerful piece on the board.

The Bishop

The bishop can be moved to any square along the diagonal line it stands on.
The bishop cannot skip over any intervening pieces.

The Rook

The rook can be moved to any square along the file (vertical/horizontal)it stands on.
The rook cannot skip over any intervening pieces.

The Knight

The knight can be moved to one of the squares near the square it stands on, but not on the same rank, file or diagonal.The knight is the only piece that can skip over intervening pieces.

Pawn

The pawn normally can be moved only forward, to one of the immediate unoccupied square or alternatively :

• First move
  The pawn can be moved one or two squares from its initial position along the same file (provided both squares are unoccupied).



• Promoting
  When a pawn reaches the rank furthest from its initial position, it must be promoted within the same move to a new piece: queen, rook, bishop or knight of the same color. The player's choice is not limited to pieces that have been captured previously.



• En passant
  When a pawn is on its fifth rank, the pawn has a special move called "en passant" meant to prevent enemy pawns from slipping past it. When a pawn attacks a square crossed by the opponent's pawn, which had advanced two squares in one move from its initial square; your pawn captures this opponent's pawn as though the opponent's pawn had been moved only one square. An "en passant" capture is only legal on the move following this advance.

1. The player, who has the white pieces, starts the game.

* In tournaments, the choice of the pieces' color is random.
2. Only one piece may occupy a square at any given time.
3. Only one piece may occupy a square at any given time.
4. A player's piece can capture an opponent's piece by moving the player's piece onto a square occupied by the opponent. At the same move, the opponent's piece is removed from the chessboard.
5. If you place the opponent's king under attack, this king is in check. Your opponent must move his or her king, in order to put the king out of risk. If your opponent cannot get his or her king out of check, that king has been checkmated and you win.
6. When a player is not in check, but cannot move because any move would lead to a check, the game is stalemated and ends in a draw.
7. If a position is repeated three times, the game ends in a draw.
8. If no player has enough pieces to checkmate the opponent, the game ends in a draw.
9. If each player makes 50 moves without a pawn being moved or without capturing opponent's piece the game is a draw.
10. 'En passant' is available
11. If a player does not complete the prescribed number of moves in the allotted time, the player will loose the game.
12. The increment time is added to the initial time after every move.
13. During a series the time isn't saved from the last game, each game have the same initial time.
14. While playing under the "Enable undo" game, each player has to stop the clock after every move by clicking on the "done" button.

• The game is won by the player, who had checkmated his opponent's king.


• The game is won by the player, whose opponent had declared resignation.

• The game is lost by the player, whose timer had run out.


• The game is lost by the player, whose king has been checkmated.

• When the player whose turn to move, has no legal option and his or her king is not in check, the game immediately ends in "stalemate" (draw).


• In a position where neither player can checkmate the opponent's king, the game ends in a "dead position":


• king versus king
• king and bishop versus king
• king and knight versus king
• king and bishop versus king and bishop with the bishops on the same color
• In a position where a checkmate cannot occur by any possible series of moves.


• When both players agree on ending the game as a draw.


• When an identical position is about to appear or had appeared on the chessboard at least three times. Identical position is considered the same, if the same player has the move, pieces of the same kind and color occupy the same squares, and the possible moves of both players' pieces are the same.


• If a game drags out such that both players make 50 moves without a capture or without a move of any pawn, the game ends automatically in a draw.


• A player wishes to offer a draw shall do so upon his or her turn. Such offer cannot be canceled and remains valid until either the opponent accepts it or the turn is over.

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