noun
kō shogi; large-board shogi variant
A historical large-board variant of shogi played on a board larger than the standard 9×9, with additional pieces. The term refers specifically to the game known as kō shogi, not large-board shogi in general.
広将棋は、江戸時代に考案された将棋の一種です。
Kō shogi is a type of shogi invented during the Edo period.
広将棋の盤は、通常の将棋よりずっと大きい。
The board for kō shogi is much larger than that of standard shogi.
From 広 (kō, 'wide') + 将棋 (shōgi, 'shogi'), referring to the larger board size compared to standard shogi.