I’ve added a new Middle (Chu) Shogi game to the site.
https://japanesechess.org/chushogi2026/
Rules
Middle Shogi is the common English name for 中将棋（ちゅうしょうぎ / Chū Shōgi）. It is an older, bigger shogi game played on a 12×12 board with 46 pieces per player (92 total) and 21 kinds of pieces.
This guide explains one common modern rule set described in Japanese sources (including special Lion rules and “no piece drops”).
Note: Some groups and computer programs use different promotion timing rules, so always agree on rules before you start. (more…)