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Chess rules
The chessboard is made up of eight rows and eight columns for a total of 64 squares of alternating colors. Each square of the chessboard is identified with a unique pair of a letter and a number. The vertical files are labeled a through h, from White´s left (i.e. the queenside) to White´s right. Similarly, the horizontal ranks are numbered from 1 to 8, starting from the one nearest White´s side of the board.
King can move exactly one square horizontally, vertically, or diagonally. At most once in every game, each king is allowed to make a special move, known as castling.
Queen can move any number of vacant squares diagonally, horizontally, or vertically.
Rook can move any number of vacant squares vertically or horizontally. It also is moved while castling.
Bishop can move any number of vacant squares in any diagonal direction.
Knight can move one square along any rank or file and then at an angle. The knight´s movement can also be viewed as an “L” or “7″ laid out at any horizontal or vertical angle.
Pawns can move forward one square, if that square is unoccupied. If it has not yet moved, the pawn has the option of moving two squares forward provided both squares in front of the pawn are unoccupied. A pawn cannot move backward. Pawns are the only pieces that capture differently from how they move. They can capture an enemy piece on either of the two spaces adjacent to the space in front of them (i.e., the two squares diagonally in front of them) but cannot move to these spaces if they are vacant. The pawn is also involved in the two special moves en passant and promotion.
Castling is the only time in the chess game when more than one piece moves during a turn. During the castling, the king moves two squares towards the rook he intends to castle with, and the rook moves to the square through which the king passed. Castling is only permissible if all of the following conditions hold:
a) neither king nor rook involved in castling may have moved from the original position;
b) there must be no pieces between the king and the rook;
c) the king may not currently be in check, nor may the king pass through or end up in a square that is under attack by an enemy piece (though the rook is permitted to be under attack and to pass over an attacked square).
En Passant may only occur when a pawn is moved two squares on its initial movement. When this happens, the opposing player has the option to take the moved pawn “en passant” as if it had only moved one square. This option, though, only stays open for one move.
If a pawn reaches the opponent´s edge of the table, it will be promoted – the pawn may be converted to a queen, rook, bishop or knight, as the player desires. The choice is not limited to previously captured pieces. Thus its´ theoretically possible having up to nine queens or up to ten rooks, bishops, or knights if all pawns are promoted.
White is always first to move and players take turns alternately moving one piece at a time. Movement is required. If a player´s turn is to move, he is not in check but has no legal moves, this situation is called “Stalemate” and it ends the game in a draw. Each type of piece has its own method of movement. A piece may be moved to another position or may capture an opponent´s piece, replacing on its square (en passant being the only exception). With the exception of the knight, a piece may not move over or through any of the other pieces. When a king is threatened with capture (but can protect himself or escape), it´s called check. If a king is in check, then the player must make a move that eliminates the threat of capture and cannot leave the king in check. Checkmate happens when a king is placed in check and there is no legal move to escape. Checkmate ends the game and the side whose king was checkmated looses.
(Source: https://www.chesscoachonline.com)
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