Chapter 3: The moves of the pieces
3.1 It is not permitted to move a piece to a square occupied by a piece of the same colour.
3.2 If a piece moves to a square occupied by an opponent's piece the latter is captured and removed from the chessboard as part of the same move. A piece is said to attack an opponent's piece if the piece could make a capture on that square according to Articles 3.4 to 3.9.
3.3 A piece is considered to attack a square, even if such a piece is constrained from moving to that square because it would then leave or place the king of its own colour under attack.
3.4 The general may move to adjoining diagonal square. It means that the most squares to choose for moving the general is only four.
3.5 The rook may move to any square along the file or the rank on which it stands.
3.6 The elephant may move to any adjoining diagonal squares and front square. It means that the most squares to choose for moving the elephant is only five.
3.7 When making these moves, the general, rook or elephant may not move over any intervening pieces.
3.8 The knight may move to one of the squares nearest to that on which it stands but not on the same rank, file or diagonal.
3.9 a. The pawn may move forward to the unoccupied square immediately in front of it on the same file, or
b. the pawn may move to a square occupied by an opponent's piece, which is diagonally in front of it on an adjacent file, capturing that piece.
c.1 When a pawn reaches one of the promotion squares, the diagonal squares of the opponent side, it can be exchanged for a general of the same colour provided the general of the same colour no longer exists on the board. The existence of the two generals of the same colour is not allowed. This exchange of a pawn for general is called 'promotion'.
Promotion squares for red pawns
Promotion squares for black pawns
c.2 The promotion can be made right on the promotion square on which the pawn stands or one of the four adjoining diagonal squares.
c.3 Even a pawn is qualified to be promoted, the promotion is not allowed at once just after reaching the promotion square. It can get the promotion on the next move or later of the same player.
c.4 The promotion shall not be made in the direct-attacking position to the opponent piece by newly-promoted general.
c.5 The promotion shall not be made in the check position to the opponent king by newly-promoted general or discovered check position by its rook.
c.6 When only a pawn is left on the board, the promotion can be made according to the player’s wish. He has the right to take the promotion after the removal of second last pawn as well as to take after moving the pawn or not to take the promotion.
c.7 When no other pieces but only a pawn is left on the board and it has no square to move and forming the stale-mate position, the player has the right not to take promotion and claim the draw. Then the game is decided as a draw. The opponent cannot force to take the promotion in order to avoid the stale-mate position.
3.10 The king can move to any adjoining square not attacked by one or more of the opponent's pieces.
3.11 The king is said to be 'in check' if it is attacked by one or more of the opponent's pieces, even if such pieces are constrained from moving to that square because they would then leave or place their own king in check. No piece can be moved that will either expose the king of the same colour to check or leave that king in check.