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The Ultimate Game of Dual Chess – When the Chessboard Is More Than Just a Battle

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    Author: Kiều Văn Quảng – Hanoi, Vietnam.

        To all chess enthusiasts!
        As a child of Hanoi, I have always nurtured a deep passion for intellectual games, where every move is a mental challenge, and every game of chess tells a story. Today, I am excited to introduce to you a masterpiece of thinking and strategy – Yin Yang Chess!
        Unlike the familiar pieces on the traditional Chess or Xiangqi boards, Yin Yang Chess brings a completely fresh breath of life, a profound Eastern philosophy embodied in the unique two-sided pieces – the Front and the Reverse sides. This is not merely a battle between two factions, but a dynamic interplay of transformation and mutual support, just like the endless cycle of Yin and Yang in the universe.
        The 9×9 chessboard serves as the battleground, with special zones such as the Imperial City – where the King and Advisor initially reside, and the Center of Harmony with the meaningful Tai Chi point at the center. Each side possesses 18 diverse pieces, from the King, Advisor, Elephant, Horse, Chariot, and Pawn, to the unique pieces that define the soul of Yin Yang Chess: the Nghi and Trung pieces.
        The Nghi piece – a symbol of transformation – is the most unique feature! This piece does not directly capture the opponent’s pieces but can flip them, turning enemy pieces into your own with a single strategic move, aided by a bait piece from your side. What may seem like a loss of a piece can, in an instant, reverse the balance of power in a dramatic fashion! The Nghi piece can also transform a Trung into a Pawn, or even “check” the opponent’s King in its own unique way.
        Then, there’s the Trung piece – a mysterious neutral piece at the start of the game. The Trung does not belong to either side but can be transformed into a powerful Pawn through the influence of the Nghi. The existence or disappearance of the Trung also affects the movement rules of the King and Advisor, creating dramatic moments where the King and Advisor can march directly into the opponent’s Imperial City under certain conditions.
        Yin Yang Chess is not just about checkmating the King. The game introduces the concept of “Absolute Victory,” a challenging goal that requires the player to meet a complex set of conditions related to the control of the Nghi, the Trung, and positioning the King at the Tai Chi point. This opens up a world of diverse strategic objectives and creates thrilling, high-stakes games.
        With a larger board, a rich array of pieces, and unique movement and interaction mechanics, Yin Yang Chess offers a depth of strategy that rivals Chess itself, while also introducing new variants and situations you’ve never encountered before.
        So, set aside your familiar moves for a moment, and embrace Yin Yang Chess to explore an entirely new world of chess – a place where intelligence and creativity are constantly tested, and where each piece holds the potential to turn the tide of the game.
        Yin Yang Chess – more than just a game, it is a journey to explore balance, transformation, and the pinnacle of strategic thinking. Join us in this adventure and feel the excitement!

    Chessboard and areas on the chessboard

    Bàn cờ và các quân cờ Lưỡng Nghi

    The Yin Yang chessboard and pieces

    Chessboard and areas on the chessboard The chessboard consists of 9 ranks, and each rank has 9 alternating colored squares. Each square is a chess cell, numbered vertically from 1 to 9 and horizontally from A to I. There are a total of 81 chess squares.

    Hoàng Thành của bên đỏ và bên xanh

    The Imperial City of the Red and Green sides

    The chessboard defines the Imperial City area for each side, the Imperial City is a 5×5 square space, limited by 5 horizontal and 5 vertical squares. The Imperial City is the King’s movement space

    Đường Trung Hòa

    The Central Harmony Line

    The Central Harmony Line: This is the intersection of the Imperial City areas of both sides, a space consisting of 5 chess squares. The two opponents are arranged on the left and right sides of the Central Harmony Line

    Tai Chi

    Tai Chi

    The center position of the chessboard is called Tai Chi. Tai Chi is also the midpoint of the Central Harmony Line.

    Types of pieces

    Obverse and reverse sides of the chess piece

    The chess pieces are short cylindrical shapes with two faces: the Obverse and the Reverse. The Obverse is surrounded by a circle, and the Reverse is surrounded by a square. The obverse side bears its own color, while the reverse side has the color of the opponent

    There are a total of 36 chess pieces on the board, with 18 pieces for each side. There are 8 types of chess pieces, including: King, Ultimate, Neutral, Confucian Scholar, Bishop, Knight, Rook, Pawn. The number of pieces for each side is as follows:

    No Types Amount
    1 King 1
    2 Ultimate 1
    3 Neutral 1
    4 Confucian Scholar 2
    5 Bishop 2
    6 Knight 2
    7 Rook 2
    8 Paw 7
    Total 18

    KING

    The King is the most important chess piece; players must protect their King from being captured by the opponent. The King is located in the center of the bottom row (E1 for red and E9 for green).

    Red King and  Green King
    Red King and Green King

    The King moves and captures the opponent’s pieces along straight and diagonal lines within his own Imperial City, with each move limited to one square..

    Hướng dịch chuyển của Vua
    Chiều di chuyển và tác động của Nghi

    Movement and action direction of Ultimate

    Chiều di chuyển và tác động của Nghi

    Red Ultimate flipping Green Knight to Red Knight with Red Bishop as bait

    Nghi đỏ chiếu Vua xanh

    Red Ultimate checking Green King

    Ultimate

    Ultimate is a characteristic piece of Yin Yang chess, making this game different from other chess variants. Ultimate is used to convert opponent’s pieces into one’s own pieces. Each side has 1 Ultimate piece, located at E3 for red and E7 for green.

    Nghi đỏ và Nghi xanh
    Red Ultimate and Green Ultimate

    Ultimate moves and acts along straight and diagonal lines of the chessboard, with no movement limit. Ultimate does not capture opponent’s pieces; it only flips the opponent’s piece to convert it into its own piece, and the converted piece remains in its original position.

    To convert an opponent’s piece into your own, there must be one of your own pieces as a bait between the opponent’s piece and the Ultimate, and only one such piece is allowed for the flip to be effective.

    The opponent can also use Ultimate to flip this piece back if conditions are met. If both sides flip the same piece, the side that flipped first is not allowed to flip more than 3 times and must make a different move. Ultimate is also used to flip Neutral into one’s own Pawn..

    Ultimate is also used to check the opponent’s King; similar to flipping an opponent’s piece, a bait piece of your own is required.

    Nghi đỏ lật Trung đỏ thành Tốt đỏ
    Red Ultimate flipping Red Neutral to Red Pawn

    Ultimate is also used to check the opponent’s King; similar to flipping an opponent’s piece, a bait piece of your own is required.

    Ultimate can be captured normally by opponent’s pieces like other pieces, but it cannot be flipped by the opponent’s Ultimate.

    Paw

    The Pawn is the most numerous piece on the board, with 7 pieces for each side. Pawns are arranged in the row in front of the King, protecting the King and the pieces behind it

    Tốt
    Obverse and reverse sides of the Red Pawn

    Red Pawns are placed at positions: A2, B2, D2, F2, G2, H2, I2.
    Green Pawns are placed at positions: A8, B8, D8, F8, G8, H8, I8.

    Pawns move straight forward one square and capture opponent’s pieces diagonally within a one-square range

    Vị trí tốt trên bàn cờ

    The pawn on the chessboard

    Mặt chính diện và phản diện của quân Trung đỏ

    Obverse and reverse sides of the Red Neutral piece

    Mặt chính diện và phản diện của quân Trung xanh

    Obverse and reverse sides of the Green Neutral piece

    Neutral

    Neutral is a neutral piece; when beginning the game, the neutral piece acts as a third party, not participating in the game. Each side has one Neutral piece, Red Neutral at C5 and Green Neutral at G5. When Neutral is in a neutral state, players are not allowed to move it or use it as bait for Ultimate. The Neutral piece has 2 faces of the same color, each side has 1 Neutral piece. Players can use Ultimate with bait to flip this Neutral piece and convert it into their own Pawn. If the opponent uses Ultimate to flip it back, this Pawn reverts to its neutral state.

    When Ultimate and bait are used to flip a Neutral piece into your own Pawn, this Pawn moves like a regular Pawn.

    Confucian Scholar

    The Confucian Scholar is an important piece for the King, protecting and shielding the King. Each side has two Confucian Scholar pieces, located on the left and right of the King, corresponding to positions D1-F1 for red and F9-D9 for green.

    The Confucian Scholar is an important piece for the King, protecting and shielding the King. Each side has two Confucian Scholar pieces, located on the left and right of the King, corresponding to positions D1-F1 for red and F9-D9 for green.

    Obverse and reverse sides of the Green Confucian Scholar piece Similar to the King, the Confucian Scholar moves and captures opponent’s pieces along straight and diagonal lines within its own Imperial City area, one square at a time. When the two neutral Neutral pieces are no longer on the board (either captured or no longer neutral) then the Confucian Scholar is allowed to move into the opponent’s Imperial City.

    The Confucian Scholar is a particularly loyal piece; when a Confucian Scholar and King are adjacent, the Confucian Scholar cannot be flipped by the opponent’s Ultimate. Only when not adjacent to the King can the Confucian Scholar be flipped and converted into an opponent’s piece. This converted Confucian Scholar piece will not be limited to movement within the Imperial City.

    Mặt chính diện và phản diện của quân Sỹ xanh

    Obverse and reverse sides of the Green Confucian Scholar piece

    Cách thức và phạm vi di chuyển của quân Sỹ

    Movement method and range of the Confucian Scholar piece

    Movement method and position of the Bishop piece

    Bishop

    Represents the elephant cavalry force – war elephants. Each side has two Bishop pieces, placed at C1-G1 for red and C9-G9 for green.

    Mặt chính diện và phản diện của quân Tượng xanh
    Obverse and reverse sides of the Green Bishop piece

    Bishops move and capture diagonally, with no range limit.

    Knight

    Pioneer Knight – representing the vanguard cavalry force, a flexible and powerful piece. Each side has two Knight pieces, placed at B1 and H1 for red and B9-H9 for green.

    Mặt chính diện và phản diện của quân Mã xanh
    Obverse and reverse sides of the Green Knight piece

    Knights move and capture opponent’s pieces within two squares in an L-shape.

    Cách thức và phạm vi di chuyển của Mã

    Movement method and range of the Knight

    Rook

     Rooks are placed at A1-I1 for red and A9-I9 for green. Rooks move along straight horizontal and vertical lines across the entire board.

    Mặt chính diện và phản diện của quân Xe đỏ
    Obverse and reverse sides of the Red Rook piece

     

    Promotion (Phong)

    When a Pawn reaches the last row of the opponent’s side of the board, it can be promoted (Phong) into one of the pieces that have been removed from the board. Promotion (Phong) counts as a move and occurs after the Pawn has landed on that square. It is not mandatory to promote (Phong) immediately when the Pawn reaches the opponent’s last row; players choose the appropriate time to promote. If a Pawn is promoted (Phong) to a Confucian Scholar, this Confucian Scholar is allowed to move freely on the board.

    Special cases

    Normally,  the King and Confucian Scholar of both sides are not allowed to cross the Central Harmony Line into the opponent’s Imperial City. If the neutral Neutral pieces are not present on the board or are completely eliminated, then the King and Confucian Scholar are allowed to move into the opponent’s Imperial City. Alternatively, if both Ultimate pieces have been captured, then the King and Confucian Scholar of both sides are allowed to move into the opponent’s Imperial City.

    Determining Win-Draw-Loss

    Normal Victory

    • When the opponent’s King can no longer move.
    • The opponent voluntarily resigns.
    • The winner receives 3 match points, and the loser receives 0 points

    Absolute Victory

    Absolute victory occurs when the following conditions are met:

    • Captured the opponent’s Ultimate piece.
    • The opponent’s Ultimate position is not occupied by any piece.
    • Your own Ultimate piece is still present and has been returned to its original position.
    • Both Neutral pieces are still neutral and remain in their original positions.
    • Your King has been brought back to the Tai Chi position.

    Draw

    • When victory is not possible, both sides agree to a draw, or victory cannot be achieved within the allowed time.
    • In a drawn match, each player receives 1 match point.