sho shogi; small shogi
A historical shogi variant played on a 9×9 board, smaller than the standard modern game. The term is primarily used in historical or game-study contexts.
Sho shogi was played on a 9×9 board and is considered the prototype of modern shogi.
A larger historical shogi variant played on a 15×15 board. 小将棋 is smaller and simpler in comparison.
From 小 (small) + 将棋 (shogi), referring to a smaller variant of the game. The exact historical derivation is uncertain, but it is known as an early form of shogi.