noun
dai dai shogi
A large historical shogi variant played on a 17×17 board during the Edo period. The term is a proper noun referring to this specific game.
大大将棋は江戸時代に考案された大型の将棋です。
Dai dai shogi is a large shogi variant devised in the Edo period.
Another large shogi variant, but played on a 15×15 board, smaller than 大大将棋.
The name literally means 'large large shogi', reflecting its expanded board size compared to other variants. The exact historical derivation is uncertain.