tai shogi
A very large shogi variant played on a 25×25 board. A historical game, not commonly played today.
Tai shogi is a type of giant shogi that uses a 25×25 board.
Another large shogi variant (36×36 board); tai shogi is smaller but still very large.
From 泰 (tai, 'great') + 将棋 (shōgi, 'shogi'). The exact historical origin is uncertain, but it is one of the large-board shogi variants developed in Japan.