Grid:
Game is played on a 5x5 board. There can be also pieces on the players' "hands".
Each player begins with a set of 6 pieces: King, Gold General, Silver General, Bishop, Rook and Pawn.
The board starting position:

• Player 0(red/black) has pieces at the bottom and Player 1(blue/white) has pieces at the top.
• For the Player 0, at the bottom from left are: King, Gold General, Silver General, Bishop, Rook. Pawn is at the front of the King.
• For the Player 1, at the top from left are: Rook, Bishop, Silver General, Gold General, King. Pawn is at the front of the King.
• Black always goes first and white goes next.

Movement:
Each piece has its own movement:

• King (王,K) moves one square in any direction (horizontally, vertically, or diagonally).
• Rook (飛,R) moves as many squares as desired horizontally or vertically.
• Bishop (角,B) moves as many squares as desired diagonally.
• Gold General (金,G) moves one square in any direction: horizontally, vertically, or diagonally. Except it cannot move backward diagonally.
• Silver General (銀,S) moves one square diagonally or one square forward.
• Pawn (歩,P) moves one square forward.
• Promoted Silver General (金,+S), Promoted Pawn (と,+P) move like Gold General.
• Promoted Rook (Dragon,龍王,+R) has movements of Rook and King.
• Promoted Bishop (Horse,龍馬,+B) has movements of Bishop and King.

Promotion:
Whenever a piece reaches, moves on, or moves out of its furthest rank (row) (rank 5 for black player and rank 1 for white player), it can be promoted. Promotions are optional except for pawn, it has to be promoted when it reaches the furthest rank.

• Rook promotes into Promoted Rook (Dragon).
• Bishop promotes into Promoted Bishop (Horse).
• Silver General promotes into Promoted Silver General.
• Pawn promotes into Promoted Pawn.
• King, Gold General cannot be promoted.

Captures:
When a player's piece goes into a square occupied by the opponent's piece, the opponent's piece is captured and goes unpromoted into the player's hand. In the subsequent turns, the player may choose to drop the piece onto the board under his control.

Drops:
On any turn, instead of moving a piece on the board, a player may select a piece in his hand and place it unpromoted on any empty square on the board, under his control. There are some restrictions:

• Pawn cannot be placed onto its furthest rank (row).
• Pawn cannot be placed onto file (column) that already contains player's unpromoted pawn.
• Pawn cannot deliver checkmate in the same turn. But it can do so in the subsequent turns.
• Dropped piece on the furthest rank (row) doesn't get promoted in the same turn. But it may be promoted in the subsequent turns.

Check, checkmate and stalemate:
If player's king is under attack of opponent's piece and would be captured in the next turn, it is in check. The player must remove the check. If he cannot, then his king is checkmated and the player loses game.
If player's king isn't in check, but also the player doesn't have any legal move, then it is stalemate, and the player also loses game.

Threefold repetition and perpetual check:
If the same position (the same board configuration, the same side to move, and the same pieces in hand) occurs for the third time (the repetitions need not be consecutive), the game ends and the Player 0 loses. Except if a King is in check, then the checking player loses.