A standard chessboard has 64 squares and 32 pieces. In 17th-century Japan, scholars devised a variant with 1,296 squares and 804 pieces, featuring 207 distinct piece types.
This massive game is called Taikyoku shogi, translated as “Ultimate Shogi.” Long considered a mere theoretical exercise recorded in historical documents, two professional players finally demonstrated it was playable by sitting down to complete a single match. That one game lasted 3,805 moves and required more than 32 hours to finish.
The 804 Wedge-Shaped Pieces
Players in a game of Taikyoku shogi start with 402 pieces each, packed into the first 11 ranks of their side of the 36-by-36 board. Setting up the board alone takes hours before a single move is made. Unlike Western chess, the pieces are not distinguished by color.
Every piece is a flat, wedge-shaped wooden block with Japanese characters painted on top. Players determine which pieces belong to them based entirely on the direction the wedge is pointing. The army includes familiar units like kings, rooks, and pawns, alongside highly specific pieces like the “Violent Dragon,” the “Blind Monkey,” and the “Running Bear.” The original rules and piece movements were documented in the Shogi Zushiki, a text published before the end of the 17th century.
Rules Without Drops
In modern, standard 9-by-9 shogi, captured pieces can be dropped back onto the board as part of the capturing player’s army. Taikyoku shogi completely abandons this rule. Once a piece is captured, it is removed from the board permanently. The game requires players to memorize hundreds of movement patterns, as many pieces have entirely unique paths.
Some pieces possess the ability to jump over other pieces, while some promote into entirely new units upon reaching the enemy camp. The ultimate objective is to capture the opponent’s king and crown prince, a task heavily complicated by a dense, fortified defense spanning hundreds of squares.
The 3,805-Move Television Match
For centuries, historians believed Taikyoku shogi was never actually played due to its overwhelming logistical complexity and the sheer time commitment required. This changed in May 2004 when the Japanese television program Trivia no Izumi organized a real match.
They constructed a massive wooden board and hired two professional shogi players to play a complete game. The players spent a grueling 32 hours and 41 minutes competing, making a total of 3,805 moves before the match concluded. The broadcast displayed the immense physical and mental stamina required to navigate the 17th-century rulebook.