Taikyoku shogi
A large historical variant of shogi played on a 36×36 board with many pieces. The term is a proper noun referring to this specific game.
See also: 将棋 (しょうぎ)
Taikyoku shogi is a type of huge shogi invented in the Edo period.
Standard Japanese chess. 大局将棋 is a specific historical variant with a much larger board and more pieces.
From 大局 (taikyoku, 'great game' or 'overall situation') + 将棋 (shōgi, 'shogi'). The exact derivation is uncertain; the name reflects the game's grand scale.