Tenjiku shogi (天竺将棋 tenjiku shōgi, "Indian chess" or 天竺大将棋 tenjiku dai shōgi "great Indian chess") is a large-board variant of shogi (Japanese chess). The game dates back to the 15th or 16th century and was based on the earlier chu shogi, which itself was based on dai shogi.
Because of the terse and often incomplete wording of the historical sources for the large shogi variants, except for chu shogi and to a lesser extent dai shogi (which were at some points of time the most prestigious forms of shogi being played), the historical rules of tenjiku shogi are not clear. Different sources often differ significantly in the moves attributed to the pieces. The descriptions listed here are a likely reconstruction based on chu shogi, the primary basis of tenjiku shogi, but not all contemporary players follow these historically-based rules. It is not clear if the game was ever played much historically, as there is no record of sets ever having been made.