maka dai dai shogi
A large historical shogi variant played on a 19×19 board. The term is a proper noun referring to this specific game.
Maka dai dai shogi is a type of giant shogi played on a 19×19 board.
摩訶 is a Buddhist transcription of a source word meaning “great,” followed by 大大 and 将棋; the name emphasizes the exceptionally large scale of this shogi variant.